Journal articles: 'COMSOL Multiphysics simulations'

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Adam, Tijjani, and U. Hashim. "COMSOL Multiphysics Simulation in Biomedical Engineering." Advanced Materials Research 832 (November 2013): 511–16. http://dx.doi.org/10.4028/www.scientific.net/amr.832.511.

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In the past two decades, COMSOL Multiphysics Software Package have emerged as a powerful tool for simulation, particularly in Nanotechnology and most importantly in biomedical application and various application involving fluid and solid interactions. Compared with conventional component or system design, distinctive advantages of using COMSOL software for design include easy assessing to the significant parameters in various levels of design, higher throughput, process monitoring with lower cost and less time consuming [1,. This review aims to summarize the recent advancements in various approaches in major types of micro fluidic systems simulations, design application of various COMSOL models especially in biomedical applications. The state-of-the-art of past and current approaches of fluid manipulation as well as solid structure design fabrication was also elaborated. Future trends of using COMSOL in nanotechnology, especially in biomedical engineering perspective.

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Asmi, Ade, Jouvan Chandra Pratama Putra, and Ismail Abdul Rahman. "Simulation of Room Airflow Using Comsol Multiphysics Software." Applied Mechanics and Materials 465-466 (December 2013): 571–77. http://dx.doi.org/10.4028/www.scientific.net/amm.465-466.571.

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Airflow in a room can be supplied both through natural mean and also by the helps of mechanical ventilation. Natural ventilation is more sustainable compared to mechanical system; however natural ventilation, it may not be sufficient to fulfil the need of ventilation for a specific room. This study presents simulation works carried out regarding to the airflow movement in a room due to mechanical ventilation. The measurement of air velocity was taken using Davis anemometer at random point in the room. The measured air velocity then used as an input in simulation work which used Comsol Multiphysics software. The simulation process begins by building up geometry of the room, assigning constant parameters, meshing the geometry of the room, and finally run the solver analysis. The results from simulations indicate that the air distributions in the room are below ASHRAE standard. This is due to the airflow distribution from the airflow injection of air-conditioning system is not well distributed. The simulations results are validated with the measured value and found that the percentage differences between the simulated and measured values are within the range of 3 - 10 %. Keywords: Simulation, Airflow movement, Mechanical ventilation, Comsol Multiphysics software

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M ziou, Nassima, Hani Benguesmia, and Hilal Rahali. "Modeling Electric Field and Potential Distribution of an Model of Insulator in Two Dimensions by the Finite Element Method." International Journal of Energetica 3, no. 1 (June 30, 2018): 01. http://dx.doi.org/10.47238/ijeca.v3i1.58.

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The electrical effects can be written by two magnitudes the field and the electrostatic potential, for the determination of the distribution of the field and the electric potential along the leakage distance of the polluted insulator, the comsol multiphysics software based on the finite element method will be used. The objective of this paper is the modeling electric field and potential distribution in Two Dimensions by the Finite Element Method on a model of insulator simulating the 1512L outdoor insulator used by the Algerian company of electricity and gas (SONELGAZ). This model is under different conductivity, applied voltage, position of clean layer and width of clean layer. The computer simulations are carried out by using the COMSOL multiphysics software. This paper describes how Comsol Multiphysics have been used for modeling of the insulator using electrostatic 2D simulations in the AC/DC module. Numerical results showed a good agreement.

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Hashim, U., M. Wesam Al-Mufti, and Tijjani Adam. "Current Trend in Simulation: A Study Simulation of Poly-Silicon Nanowire Using COMSOL Multiphysics." Advanced Materials Research 795 (September 2013): 669–73. http://dx.doi.org/10.4028/www.scientific.net/amr.795.669.

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Poly-Silicon nanowire (Poly-Si-NW) simulations are very important field of nanotechnology and nanostructures; in this paper presented review in general nanowire and it applications such as thermoelectric device (TED) has potential applications in areas such as chip level cooling/ energy harvesting and many more applications in this field .COMSOL multiphysics is one of programmers using for nanotechnology and nanowires simulation, hence in this review paper, COMSOL simulation with different types of materials using for nanowire and other structures. Also In this work, we explore the effect of the electrical contact resistance on the performance of a TED. COMSOL simulations are performed on Poly-SiNW to investigate such effects on its cooling performance. Intrinsically, Poly-SiNW individually without the unwanted parasitic effect has excellent cooling power density. However, the cooling effect is undermined with the contribution of the electrical contact resistance.

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Liu, Y. C., Y. C. Huang, Yun Jhe Tang, and Tzu Hsuan Lei. "Evaluations of Absorption Materials Applied in the Noise Reduction: Experiment and Simulation." Materials Science Forum 947 (March 2019): 125–29. http://dx.doi.org/10.4028/www.scientific.net/msf.947.125.

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This article presents a finite element simulation method for airflow resistance of material to predict the influence of absorption material applied to compressor box. To obtain the real airflow resistance, a measurement system based on the standard ASTM C522-03 was systematically built up and carefully verified. Furthermore, commercial finite element software, COMSOL Multiphysics, was adopted to create the model and execute the simulation with and without absorption material. Results showed that airflow resistance increases with the thickness and the density of the material. This system is quite stable and suited to any material. With the aid of COMSOL Multiphysics simulations, the performance of noise with and without absorption material can be analyzed and compared with experimental results. There was good agreement between experimental and simulation results. Based on absorption material of 15,278 Pa.s/m3 airflow resistance, the noise level outside the compressor box obtained from experiment was around 10 dBA higher than that obtained from simulation.

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Tang, Guan Rong, Si Di, Xin Xu, and Qiu Lan Chen. "Design and Simulation of Piezoresistive Pressure Sensor for Ocean Depth Measurements." Applied Mechanics and Materials 411-414 (September 2013): 1552–58. http://dx.doi.org/10.4028/www.scientific.net/amm.411-414.1552.

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This paper presents the design and simulation of a piezoresistive pressure sensor with wide operation range (up to the pressure of 1000 m-deep water). Structural and electrical simulations were carried out using COMSOL Multiphysics 4.3. The dimension of the membrane, and the geometry and placement of piezoresistors, were optimized through structural simulations. Electrical simulations were used to evaluate the performance of selected sensors. The output characteristics revealed good linearity throughout the measurement range with sensitivities of 0.4500~0.8964 mV/V/MPa. The optimum design of sensor was determined according to the simulation results.

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Mazloum, Shawki, Sary Awad, Youssef Abou Msallem, Nadine Allam, Khaled Loubar, and Mohand Tazerout. "Modeling of a pyrolysis batch reactor using COMSOL Multiphysics." MATEC Web of Conferences 261 (2019): 04003. http://dx.doi.org/10.1051/matecconf/201926104003.

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Plastic Pyrolysis is a thermal degradation process; it offers an important alternative energy. The aim of this study is to model a batch reactor to be used for plastic pyrolysis. Consequently, four experiments with different heating and cooling cycles are done using an empty pyrolysis batch reactor and four temperatures are measured at different locations on the reactor. On the other hand, the empty reactor is modeled and several simulations are done, using COMSOL Multiphysics software, under the same experimental conditions. By comparing the temperatures obtained from simulation to those measured experimentally, it is noticed that the results are very close with a maximum error of 4%, hence the model is validated.

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Aissa, Abderrahmane, Mohamed Abdelouahab, Abdelkader Noureddine, Mohammed Elganaoui, and Bernard Pateyron. "Ranz and Marshall correlations limits on heat flow between a sphere and its surrounding gas at high temperature." Thermal Science 19, no. 5 (2015): 1521–28. http://dx.doi.org/10.2298/tsci120912090a.

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Direct numerical simulations (DNS) for axisymmetric plasma jet are developed to investigate particle plasma spraying process. In this paper we study the plasma jet and we focus mainly on the plasma-particle ex-changes. Finite element analysis employing COMSOL Multiphysics software is used in this simulation. Finally, comparisons are made with the numerically observed particle Nusselt?s numbers and theoretically predicted Nusselt?s numbers based on the Ranz-Marshall correlation. The results agree well with those obtained previously.

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Lei, Lei, Hong Bo Zhang, Donald J. Bergstrom, Bing Zhang, and Wen Jun Zhang. "Modeling of Droplet Generation by a Modified T-Junction Device Using COMSOL." Applied Mechanics and Materials 705 (December 2014): 112–16. http://dx.doi.org/10.4028/www.scientific.net/amm.705.112.

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This paper presents a numerical study of the formation of droplets in a novel two-dimensional T-junction device by using a commercial CFD package: COMSOL Multiphysics. Numerical simulations were carried out for different flow conditions. Different flow rates lead to four regimes: continuous flow, droplet generation, detached, and stalled. The capillary number of the cross-flow turns out to be the key factors in the droplet generation process. The simulation results are validated by comparison to the existing experimental data.

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El Achkar, Georges, Bin Liu, and Rachid Bennacer. "Numerical study on the thermohydraulic performance of a reciprocating room temperature active magnetic regenerator." E3S Web of Conferences 128 (2019): 07001. http://dx.doi.org/10.1051/e3sconf/201912807001.

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In this paper, the thermohydraulic performance of a reciprocating room temperature active magnetic regenerator (AMR), with gadolinium (Gd) particles used as a magnetocaloric material (MCM) and water used as a working fluid, was numerically investigated. A two-dimensional transient flow model was developed using COMSOL Multiphysics, in order to determine the water flow distribution in two AMRs of cross and parallel Gd particles distributions for different water inlet velocities of 0.06 m.s-1, 0.08 m.s-1 , 0.1 m.s-1 and 0.12 m.s-1. The Gd particles have a radius of 1.5 mm and a distance from one another of 0.9 mm. Based on the simulations results of the first model, a two-dimensional transient coupled flow and heat transfer model was then developed using COMSOL Multiphysics, in order to characterise the convective heat transfer in the AMR of cross Gd particles distribution for the same water inlet velocities.

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Nanu, Sergiu, Niculae Marinescu, Daniel Ghiculescu, and Claudiu Pirnău. "Specific Aspects on Modelling and Simulation of the Synchronized Ultrasonic Assistance of the Electro-Discharge Machining Process." Applied Mechanics and Materials 371 (August 2013): 225–29. http://dx.doi.org/10.4028/www.scientific.net/amm.371.225.

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The context of our research is based on the conclusion that simulation is used to describe and analyse the behavior of an existing or conceptual system. Electro discharge machining aided by ultrasonics EDM+US (as well as micro) is a complicated process that requires a powerfull tool to simulate. In this study we considered COMSOL multiphysics FEA software, using our own developed parametric model based on literature survey knowledge and our own previuos researches on subject. Some preliminary simulations results and conclusions are also presented.

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Thilmany, Jean. "Multiphysics: All at Once." Mechanical Engineering 132, no. 02 (February 1, 2010): 39–41. http://dx.doi.org/10.1115/1.2010-feb-5.

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This study presents an overview of multiphysics software, whose implementation simulate physical phenomena in tandem to depict real-life behavior on a virtual prototype. In order to give engineers access to multiphysics packages, many vendors’ focus now is on speeding the applications and making them intuitive to use. Multiphysics software analysis is helping to reduce feedback noise in hearing aids made by Widex of Copenhagen, Denmark. Engineers at hearing aid maker Widex use Comsol multiphysics software to simulate vibrations within the ear, and thus to reduce hearing-aid noise and feedback. Meanwhile, engineers at steelmaker ArcelorMittal of Luxembourg City, Luxembourg, turned to multiphysics modeling to help them find the most corrosion-resistant steel possible. Developers of multiphysics software say they are addressing the reality that physical phenomena do not operate singly in nature. They believe that solving for multiple phenomena can make simulations more realistic. And they are designing software packages to be easier to use and more accessible, to put them into the hands of more engineers.

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Łapczyński, Sebastian, Michał Szulborski, Karol Gołota, Łukasz Kolimas, and Łukasz Kozarek. "Mechanical and Electrical Simulations of the Tulip Contact System." Energies 13, no. 19 (September 25, 2020): 5059. http://dx.doi.org/10.3390/en13195059.

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The purpose of this work is to discuss the tulip contact behavior during mechanical and electrical simulations in a Finite Element Method (FEM) environment using ANSYS and COMSOL software. During the simulations, the full contact movement was analyzed. During the contact movement, the individual behavior of the contact components was taken into consideration. The motion simulation was carried out at different velocities and forces acting on the contact. The obtained results were compared to each other and discussed. Relatively, the angles of the contact surfaces to each other were also changed, which meant that we could conduct a more in-depth analysis. The other approach of simulation research was a field analysis of physical phenomena occurring in the tulip contact. This analysis was performed in COMSOL Multiphysics. Parametric analysis allowed an observation of the electric field in the tulip contact at different contact distances with respect to each other. This work is important in terms of the cost effectiveness for design procedures concerning tulip contacts and fault avoidance, which both result from mechanical and electrical conditions throughout contact exploitation and optimization of the working conditions for the tulip contact.

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Chung, Chin Ming, Ching Huei Lin, and Che Wei Lin. "COMSOL Simulations for Flow Channels of Low-Temperature Fuel Cell." Advanced Materials Research 343-344 (September 2011): 261–66. http://dx.doi.org/10.4028/www.scientific.net/amr.343-344.261.

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A multiple physical finite elements to analyze software (COMSOL Multiphysics) is employed to investigate serpentine flow channels of a small proton exchange membrane fuel cell with power 0.5W. Distributions of the oxygen flow, the liquid water, and the electric current density in three different designed flow channels are simulated and compared. Results show that increasing the channel width is conducive to increase the oxygen flow and reduce the production of liquid water. It thus enhances the electric current density. However, it will reduce the oxygen flow, produce more liquid water, and depress the current density if the channel width is decreased.

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Stawicki, Krzysztof, Beata Szuflitowska, and Marcin Ziolkowski. "Recent simulation results of the magnetic induction tomography forward problem." Archives of Electrical Engineering 65, no. 2 (June 1, 2016): 327–36. http://dx.doi.org/10.1515/aee-2016-0024.

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Abstract In this paper we present the results of simulations of the Magnetic Induction Tomography (MIT) forward problem. Two complementary calculation techniques have been implemented and coupled, namely: the finite element method (applied in commercial software Comsol Multiphysics) and the second, algebraic manipulations on basic relationships of electromagnetism in Matlab. The developed combination saves a lot of time and makes a better use of the available computer resources.

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Mhamdi, Ibtissem, Fakhreddine S. Oueslati, and Rachid Bennacer. "Nanofluid convection taking into account the Soret effect and its impact on heat transfer and fluid flow." MATEC Web of Conferences 330 (2020): 01021. http://dx.doi.org/10.1051/matecconf/202033001021.

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The present study is a numerical simulation of natural convection in nanofluids, within in a square cavity differentially heated, to identify the fluid flow and heat transfer by considering the Soret effect during which a temperature gradient in a binary mixture gives rise to a concentration gradient. The governing equations solved numerically using the finite element method following the use of COMSOL Multiphysics. The effects of various parameters, the Rayleigh number, the nanoparticle concentration and the type of nanofluid are analyzed. Our simulations reveal that the heterogeneity of the nanofluid, which is generated by the Soret effect, increases the heat transfer.

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Akano, Theddeus Tochukwu. "Numerical Study of Prosthetic Knee Replacement Using Finite Element Analysis." Journal of Biomimetics, Biomaterials and Biomedical Engineering 44 (February 2020): 9–26. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.44.9.

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The knee at times undergoes a surgical process to substitute the weight-bearing surfaces of the knee joint. This procedure relieves the pain and disability around the knee joint. This research paper studied the knee arthroplasty, also referred to as knee replacement. This work was aided with computer vision for visual and accuracy. Autodesk fusion 360 and the stl files were used to generate cemented, posterior stabilised knee prosthesis and imported into the COMSOL Multiphysics software. Then, the three-dimensional models of the total knee arthroplasty (TKA) prosthetic structure are produced. The prosthetic components are modelled as linear isotropic elastic materials. Finite element (FE) simulations using COMSOL Multiphysics on a CAD model of a knee are effectuated to show the effect of several loads and strains on the knee. FE analysis of the model indicates that the orthotropic model depicts a more realistic stress distribution of the knee as it reveals the detailed anatomy of the entire knee structure. The computational results of this work displayed a fair agreement with experimental information from the literature.

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Nowbahari, Arian, Avisek Roy, Muhammad Nadeem Akram, and Luca Marchetti. "Analysis of an Approximated Model for the Depletion Region Width of Planar Junctionless Transistors." Electronics 8, no. 12 (December 1, 2019): 1436. http://dx.doi.org/10.3390/electronics8121436.

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In this paper, we investigate the accuracy of the approximated analytical model currently utilized, by many researchers, to describe the depletion region width in planar junctionless transistors (PJLT). The proposed analysis was supported by numerical simulations performed in COMSOL Multiphysics software. By comparing the numerical results and the approximated analytical model of the depletion region width, we calculated that the model introduces a maximum RMS error equal to 90 % of the donor concentration in the substrate. The maximum error is achieved when the gate voltage approaches the threshold voltage ( V t h ) or when it approaches the flat band voltage ( V F B ) of the transistor. From these results, we concluded that this model cannot be used to determine accurately the flat-band and the threshold voltage of the transistor, although it represents a straightforward method to estimate the depletion region width in PJLT. By using the approximated analytical model, we extracted an analytical formula, which describes the electron concentration at the ideal boundary of the depletion region. This formula approximates the numerical data extracted from COMSOL with a relative error lower than 1 % . The proposed formula is in our opinion, as useful as the formula of the approximated analytical model because it allows for estimating the position of the depletion region also when the drain and source terminals are not grounded. We concluded that the analytical formula proposed at the end of this work could be useful to determine the position of the depletion region boundary in numerical simulations and in graphical representations provided by COMSOL Multiphysics software.

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Nakate, Prajakta, Domenico Lahaye, Cornelis Vuik, and Marco Talice. "Analysis of the Aerodynamics in the Heating Section of an Anode Baking Furnace Using Non-Linear Finite Element Simulations." Fluids 6, no. 1 (January 19, 2021): 46. http://dx.doi.org/10.3390/fluids6010046.

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The emissions from the industrial furnaces impact the environment. Among the various factories, those having anode baking furnaces are working on reducing the pollutant emissions. The aerodynamics in the furnace influences the emissions due to the high dependence of combustion and radiation phenomena on the mixing characteristics. Therefore, this paper aims to establish the numerical simulation results for the three-dimensional turbulent flow in a single section of an anode baking furnace with a high rate of fuel injection. The stabilized non-linear finite element approach on the Reynolds-averaged Navier-Stokes (RANS) equation is used with COMSOLMultiphysics. The turbulent viscosity ratio is highly sensitive to the mesh for the standard k-ϵ model. The requirements of the Cartesian and refined mesh near the jet development region is explained. The comparison of meshes generated by two meshing tools namely cfMesh and COMSOL Multiphysics default Mesher is carried out. The high numerical diffusion in the flow models due to the coarser mesh leads to convergence but deficit the precision in the results. This paper shows that the mesh generated by cfMesh with flow aligned refinement combined with the non-linear finite element solver in COMSOL Multiphysics proves to provide accurate results of turbulent quantities.

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Crha, Jakub, Pavlína Basařová, Marek C. Ruzicka, Ondřej Kašpar, and Maria Zednikova. "Comparison of Two Solvers for Simulation of Single Bubble Rising Dynamics: COMSOL vs. Fluent." Minerals 11, no. 5 (April 25, 2021): 452. http://dx.doi.org/10.3390/min11050452.

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Multiphase flows are a part of many industrial processes, where the bubble motion influences the hydrodynamic behavior of the batch. The current trend is to use numerical solvers that can simulate the movement and mutual interactions of bubbles. The aim of this work was to study how two commercial CFD solvers, COMSOL Multiphysics and Ansys Fluent, can simulate the motion of a single rising bubble in a stagnant liquid. Simulations were performed for spherical or slightly deformed bubbles (Db = 0.6, 0.8, and 1.5 mm) rising in water or in propanol. A simple 2D axisymmetric approach was used. Calculated bubble terminal velocities and bubble shape deformations were compared to both experimental data and theoretical estimations. Solver Comsol Multiphysics was able to precisely calculate the movement of smaller and larger bubbles; due to the 2D rotational symmetry, better results were obtained for small spherical bubbles. The deformation of larger bubbles was calculated sufficiently. Solver Ansys Fluent, in the setting used, failed to simulate the motion of small bubbles due to parasitic currents but allowed for modeling of the motion of larger bubbles. However, the description of the bubble velocity and shape was worse in comparison with experimental values.

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Carlini, Maurizio, Sarah Josephine McCormack, Sonia Castellucci, Anita Ortega, Mirko Rotondo, and Andrea Mennuni. "Modelling and Numerical Simulation for an Innovative Compound Solar Concentrator: Thermal Analysis by FEM Approach." Energies 13, no. 3 (January 22, 2020): 548. http://dx.doi.org/10.3390/en13030548.

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The work presents a heat transfer analysis carried out with the use of COMSOL Multiphysics software applied to a new solar concentrator, defined as the Compound Parabolic Concentrator (CPC) system. The experimental measures have been conducted for a truncated CPC prototype system with a half-acceptance angle of 60°, parabola coefficient of 4 m−1 and four solar cells in both covered and uncovered configurations. These data are used to validate the numerical scenario, to be able to use the simulations for different future systems and works. The second challenge has been to change the reflector geometry, the half-acceptance angle (60° ÷ 75°) and the parabola coefficient (3 m−1 ÷ 6 m−1) to enhance the concentration of sun rays on the solar cells. The results show that the discrepancy between experimental data and COMSOL Multiphysics (CM) have led to validate the scenarios considering the average temperature on the solar cells. These scenarios are used for the parametric analysis, observing that the optimal geometry for the higher power and efficiency of the whole system is reached with a lower half-acceptance angle and parabola coefficient.

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Mezghani, Fadhil, Dominique Barchiesi, Abel Cherouat, Thomas Grosges, and Houman Borouchaki. "Comparison of 3D Adaptive Remeshing Strategies for Finite Element Simulations of Electromagnetic Heating of Gold Nanoparticles." Advances in Mathematical Physics 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/469310.

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The optical properties of metallic nanoparticles are well known, but the study of their thermal behavior is in its infancy. However the local heating of surrounding medium, induced by illuminated nanostructures, opens the way to new sensors and devices. Consequently the accurate calculation of the electromagnetically induced heating of nanostructures is of interest. The proposed multiphysics problem cannot be directly solved with the classical refinement method of Comsol Multiphysics and a 3D adaptive remeshing process based on ana posteriorierror estimator is used. In this paper the efficiency of three remeshing strategies for solving the multiphysics problem is compared. The first strategy uses independent remeshing for each physical quantity to reach a given accuracy. The second strategy only controls the accuracy on temperature. The third strategy uses a linear combination of the two normalized targets (the electric field intensity and the temperature). The analysis of the performance of each strategy is based on the convergence of the remeshing process in terms of number of elements. The efficiency of each strategy is also characterized by the number of computation iterations, the number of elements, the CPU time, and the RAM required to achieve a given target accuracy.

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Paul, Seema, Jesper Oppelstrup, Roger Thunvik, John Mango Magero, David Ddumba Walakira, and Vladimir Cvetkovic. "Bathymetry Development and Flow Analyses Using Two-Dimensional Numerical Modeling Approach for Lake Victoria." Fluids 4, no. 4 (October 10, 2019): 182. http://dx.doi.org/10.3390/fluids4040182.

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This study explored two-dimensional (2D) numerical hydrodynamic model simulations of Lake Victoria. Several methods were developed in Matlab to build the lake topography. Old depth soundings taken in smaller parts of the lake were combined with more recent extensive data to produce a smooth topographical model. The lake free surface numerical model in the COMSOL Multiphysics (CM) software was implemented using bathymetry and vertically integrated 2D shallow water equations. Validated by measurements of mean lake water level, the model predicted very low mean flow speeds and was thus close to being linear and time invariant, allowing long-time simulations with low-pass filtered inflow data. An outflow boundary condition allowed an accurate simulation to achieve the lake’s steady state level. The numerical accuracy of the linear measurement of lake water level was excellent.

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Kim, Hyoung Tae, Se-Myong Chang, Young Woo Son, and Taegee Min. "Multiphysical Simulations for the IAEA/ISCP Benchmark Model on the Contact of Pressure Tube and Calandria Tube in the Moderator System of CANDU-6 PHWR." Science and Technology of Nuclear Installations 2018 (November 1, 2018): 1–8. http://dx.doi.org/10.1155/2018/3096862.

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The LOCA (loss of coolant accident) is a kind of severe accident in the operation of PHWR (pressurized heavy water reactor) as well as other nuclear facilities, and possible cause of LOCA can be counted on the ballooning of pressure tube (PT) contacted to the outer calandria tube (CT) in the moderator system of CANDU-6 reactors. In the paper, we simulated the 150-kW experimental facility proposed by IAEA/ISCP, modeling the transient creeping behavior of pressurized tube heated with thermal radiation between the gaps of two concentric pipes. The outer boundary is simplified with a switched model that depends on the local temperature. With a multiphysical model supported by a commercial code, COMSOL multiphysics, the unsteady phenomena are simulated with models concerning various kinds of mechanics such as thermodynamics, nonlinear structural dynamics, and two-phase boiling heat transfer models.

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Balasubramanian, Vishal, V. S. Selvakumar, L. Sujatha, M. Revathi, and C. V. Gayathri. "Electro Thermal Effects of Geometrically Modified MEMS-Based Micro Heater for Gas Sensing Applications." Sensor Letters 17, no. 9 (September 1, 2019): 725–32. http://dx.doi.org/10.1166/sl.2019.4141.

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Micro heaters play a major role in gas sensing applications owing to their accuracy, selectivity and low power consumption. The proposed micro heater employs a window type polysilicon micro-hotplate structure, which is a square cell of side 500 μm, designed using COMSOL Multiphysics. It is highly imperative that an evenly distributed temperature is necessary over the broad area of the heater in order to improve its gas sensitivity and selectivity. In this paper, we have explained the design and analysis of a novel window-type micro heater made of polysilicon. The main aim of the work is to achieve temperature uniformity and low power consumption. By optimizing the geometry of the micro heater, we can obtain both temperature uniformity and low power consumption. This geometrical optimization also improves the sensitivity and response time of the sensor. To support them, we have carried out simulations using COMSOL Multiphysics. The proposed structure has obtained a uniform temperature of 1134.1 K and an average temperature of 1130.39 K. Such high and uniform temperatures finds applications in gas sensors. This work also analyzes the proper choice and placement of electrodes across the geometry of the heater.

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Zakrisson, J., I. Silander, C. Forssén, Z. Silvestri, D. Mari, S. Pasqualin, A. Kussicke, P. Asbahr, T. Rubin, and O. Axner. "Simulation of pressure-induced cavity deformation – the 18SIB04 Quantumpascal EMPIR project." ACTA IMEKO 9, no. 5 (December 31, 2020): 281. http://dx.doi.org/10.21014/acta_imeko.v9i5.985.

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The 18SIB04 QuantumPascal EMPIR project aims for development of photon-based standards that can replace primary standards of the SI unit of pressure, the Pascal. In this project, four partners simulated the pressure-induced deformation of a given Fabry-Pérot cavity, using various versions of two types of software, COMSOL Multiphysics (R) and ANSYS Workbench. It was demonstrated that, for a given geometry and set of material parameters, simulations of the deformation could be performed by the various partners with such small discrepancies that methodological mistakes of the simulation procedures will solely contribute to a sub-ppm uncertainty in the assessments of refractivity of N<sub>2</sub>.

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Yang, Xiaoni, Juanjuan Ma, Yongye Li, Xihuan Sun, Xiaomeng Jia, and Yonggang Li. "Wall Stresses in Cylinder of Stationary Piped Carriage Using COMSOL Multiphysics." Water 11, no. 9 (September 13, 2019): 1910. http://dx.doi.org/10.3390/w11091910.

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Hydraulic transportation of the piped carriage is a new energy-saving and environmentally-friendly transportation mode. There are two main states in the conveying process, stationary and moving. In the process of hydraulic transportation of the piped carriage, the study of the stress of the water flow act on the cylinder wall of the piped carriage can help to improve the design of the piped carriage structure and even the selection of piped carriage materials. The distribution of flow velocity around the stationary piped carriage and the stress distribution on the cylinder wall of the stationary piped carriage were investigated by combining numerical simulations with model experiment verification. The commercial finite element software, Comsol Multiphysics, was utilized to solve this problem using the arbitrary Lagrangian–Eulerian (ALE) method. The results showed that the simulation results were in good agreement with the experimental results. It also showed that the ALE method can well be applied for fluid-structure problems in the process of hydraulic transportation of the piped carriage. The simulation results showed that the low velocity region near the inner wall of the pipe was smaller than that near the outer wall of the piped carriage, and both regions decreased with the increase of the discharge. The maximum stress on the cylinder wall of the piped carriage appeared between the two support feet in the middle and rear sections of the cylinder. The influence of the unit discharge on wall stress increased with the increase of the discharge, that is, k1 < k2 < k3. Moreover, the increase of the discharge had the greatest influence on the circumferential component of the principal stress of the cylinder, followed by the axis component, and the smallest influence on the wall shear stress of the cylinder, i.e., k ¯ σ c > k ¯ σ a > k ¯ σ r > k ¯ τ c .

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Charvátová, Hana, Aleš Procházka, and Martin Zálešák. "Computer Simulation of Passive Cooling of Wooden House Covered by Phase Change Material." Energies 13, no. 22 (November 19, 2020): 6065. http://dx.doi.org/10.3390/en13226065.

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The paper is devoted to computer simulations of the distribution and time evolution of the temperature in a wooden house in summer. The goal of simulations was to assess the effect of covering walls inside the house with a PCM (phase change material) on its passive cooling, which prevents the undesired overheating of the house and provides the required thermal comfort for the occupants under warm summer days. Computer simulations were performed by the COMSOL Multiphysics software (COMSOL Inc., Stockholm, Sweden). A model of a house without the PCM coverage was compared with models of houses in which the PCM was located on all walls, except a floor, and on a wall opposite the window. Results of simulations proved that the wood wall thickness and PCMs location influence overheating the wooden house. Under studied conditions, the coverage of a wall opposite the window best eliminated extremes of the air temperature inside the house. The maximum temperature decrease was 3.9 °C (i.e., drop of 31.1%) comparing the house which wall opposite the window was covered by the PCM and the house without the PCM coverage.

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Forero-Longas, Freddy, Adriana Patricia Pulido-Díaz, and Kelly Johana Pedroza-Berrio. "Computational simulation of concentration by osmotic evaporation of passion fruit juice (Passiflora edullis)." Revista Facultad de Ingeniería 26, no. 44 (January 25, 2017): 95. http://dx.doi.org/10.19053/01211129.v26.n44.2017.5775.

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This study aimed at implementing a comprehensive strategy for the multiphysics simulation of the osmotic evaporation process applied in the concentration of passion fruit juice. The phenomena of mass and momentum transfer were analyzed in Comsol® and Matlab®, using a two-dimensional axial geometry as a simplification of the membrane module. Computer simulations were validated through comparisons with experimental data obtained from osmotic evaporation of passion fruit juice previously ultrafiltrated. The juice was concentrated to 52.25 ± 0.36 (°Brix) of soluble solids, reaching a final flux of 0.63 (kg/m2h) after 6 hours. The concentrate retained the organoleptic and physicochemical quality characteristics of the original juice when it was reconstituted in water. The models and simulations developed can be used to describe, analyze, and efficiently improve the osmotic evaporation process applied to the concentration of juices.

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YANG, JING-JING, MING HUANG, SHU-JUAN MU, SAI CHENG, MENG WANG, and HAO TANG. "DESIGN OF THE N-SIDED REGULAR POLYGONAL TRANSPARENT DEVICE USING METAMATERIALS." International Journal of Modern Physics B 26, no. 30 (October 7, 2012): 1250162. http://dx.doi.org/10.1142/s0217979212501627.

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Based on the coordinate transformation method, we derived the material parameters for arbitrary N-sided regular polygonal transparent device, which is an important device for antenna protection. The electric field distributions of the device under TE wave and cylindrical wave irradiation are simulated using the finite element solver COMSOL Multiphysics. It shows that although the incident waves are distorted in the transformation region, they return to the original wavefronts when passing through the transformation region. The results of full-wave simulations validate the material parameters for the N-sided regular polygonal transparent device we derived.

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Yusubov, Fikrat Fakhraddin. "Frictional Heat Simulation of Brake Composites in a Pin-on-Disc Tribotesting." Nano Hybrids and Composites 32 (April 2021): 63–71. http://dx.doi.org/10.4028/www.scientific.net/nhc.32.63.

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This paper presents the comparative investigation of temperature distributions in the pin-on-disc tribo-contact with dry friction conditions. Heat generation and distribution mechanism in contact of a pin made by phenolic resin–based brake friction composite and 35HNL steel disc counter-face material were studied. Both experimental and simulation methods were used to study the temperature changes. In order to analyse the thermal effects, the change in the coefficient of friction with time were also characterized. Experimental friction tests performed on universal “pin-on-disc"-type friction and wear test machine model MMW-1. Interface temperature measurements of the disc was conducted non-contact type infra-red laser thermometer. Heat simulations were modelled via finite element method using COMSOL Multiphysics 5.5, Heat Transfer in Solid Module. The simulations helped to determine in the increase of temperature over selected time period. Obtained experimental results compared with results of numerical analysis.

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Yousaf, A., J. M. Boccard, F. A. Khan, and L. M. Reindl. "Near-field wireless sensing of single and multiple open-ended micro coils." Journal of Sensors and Sensor Systems 2, no. 1 (May 2, 2013): 35–43. http://dx.doi.org/10.5194/jsss-2-35-2013.

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Abstract. In this work we present near-field wireless sensing of single and multiple open-ended micro coils using an electrically small loop antenna. Wirelessly characterized parameters of open-ended micro coils include its resonance frequency, quality factor and inductance. Moreover a wireless frequency-dependent analytical model was developed. Micro coil inductance was extracted from the wirelessly measured signal using a constraint-based least-squares approach. Wireless measurements and analytical fit of micro coils are in strong agreement which validates the analytical model. Finite element method (FEM) simulations of the coupled system were done in COMSOL Multiphysics.

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Janicijevic, Milovan, Milesa Sreckovic, Branka Kaludjerovic, Mirko Dinulovic, Zoran Karastojkovic, Predrag Jovanic, and Zorica Kovacevic. "Evaluation of laser beam interaction with carbon based material - glassy carbon." Chemical Industry and Chemical Engineering Quarterly 21, no. 1-1 (2015): 63–69. http://dx.doi.org/10.2298/ciceq140131006j.

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Laser beam interaction with carbon based material (glassy carbon) is analyzed in this paper. Nd3+:YAG laser beam (1.06?m i.e. near infrared, NIR range) in ms regime with various energy densities is used. In all experiments, provided in applied working regimes, the surface damages have occurred. The results of laser damages are analyzed by light and electron scanning (SEM) microscopies. Program Image J is executed for quantitative analysis of generated damages based on micrographs obtained by light and SEM microscopes. Temperature distribution in exposed samples is evaluated by numerical simulations based on program packages COMSOL Multiphysics 3.5 in limited energy range.

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Siddaiah, Nalluri, D. V. Rama Koti Reddy, Y. Bhavani Sankar, R. Anil Kumar, and Hossein Pakdast. "Modeling and Simulation of Triple Coupled Cantilever Sensor for Mass Sensing Applications." International Journal of Electrical and Computer Engineering (IJECE) 5, no. 3 (June 1, 2015): 403. http://dx.doi.org/10.11591/ijece.v5i3.pp403-408.

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Cantilever sensors have been the growing attention in last decades and their use as a mass detector. This work presents design, modeling and analysis of Triple coupled cantilever(TCC) sensor using MEMS simulation software Comsol Multiphysics with critical dimensions of 100μm length,20μm width and 2μm thickness. Simulations were performed based on finite element modeling techniques, where different resonant frequencies were observed for different modes of operation. It is also observed that the resonant frequency of the sensor decreases as some mass is applied on one particular cantilever. The various parameters greatly affecting the performance of TCC such as resonant frequency, dimensions, material and pressure or force applied on it.we also observed that while adding some mass on any one lateral cantilever, the resonant frequency of that respective mode reduced.

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Aljanabi, Mohanad. "Resonance frequency analysis of laser optical fiber based on microcantilever." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 4 (August 1, 2019): 3090. http://dx.doi.org/10.11591/ijece.v9i4.pp3090-3099.

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<p>The normal frequency of smart beams was originated utilizing FEM [Ansys and Comsol] code for first five modes by varying the position of actuator from the fixed end of the structure, and it has a suitable arrangement with analytically found the standard frequency. This paper includes learning a resonance frequency analysis of laser optical fiber based on microcantilever of designing magnetic actuator using Ansys and Comsol simulation. The design of optical fiber includes Nickel cantilever, two magnets and one coil that apply to force on the cantilever. After the current flows in the coil domain, the shape of microcantilever will be deformed. It will move to z- direction that depends on the force direction. Two methods including, Comsol Multiphysics, Ansys and analytical equations have been utilized to calculate the resonance frequency, current and force values. The simulation results include calculating the current (magnetic current density) and effects of the magnetic field of the coil on the cantilever (force calculation). Utilizing this method is to limit faults(errors) of optical fiber laser between transmitter and receiver system (detection system) for any time of cutting coil when the signal of a laser passes through the coil. In conculsions, resonant frequency (f_n) tuning using cantilivier presented in the resrach have larger variable range by using simulations. However,the adjusting of the system and changing the deminsions.Resolutions to this problematic contain tuning the modes of resonant frequency to produce by cantilivier with 2-magnets and coil when the signal pass from laser source. Based on these simulations and characterization results, the proposed assembly can be a good applicant for evolving a low price, high material platform for many biological, laser optical fiber, communication, machine learning, biosensors and biomedical applications. </p>

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Husmann, Anke, Kendell Pawelec, Clare Burdett, Serena Best, and Ruth Cameron. "Numerical simulations to determine the influence of mould design on ice-templated scaffold structures." Journal of Biomedical Engineering and Informatics 1, no. 1 (August 10, 2015): 47. http://dx.doi.org/10.5430/jbei.v1n1p47.

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In recent years, there has been a shift from traditional cell culture on two-dimensional substrates towards the use of three-dimensional scaffolds for tissue engineering. Ice-templating is a versatile tool to create porous scaffolds from collagen. Here we discuss specific considerations for the design of moulds to produce freeze dried collagen scaffolds with pore sizes of around 100µm, a range that is relevant to tissue engineering. A numerical model of heat conduction, implemented in COMSOL Multiphysics® version 5.0, calculated the temperature contour lines and heat flow vectors during cooling for a variety of mould geometries and materials. We show how temperature distribution within moulds determines the resulting pore structure of the scaffolds by regulating ice growth, and we validate our simulation against experimental results. These simulations are especially useful when working with moulds that contain volumes of more than 1cm in each direction.

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Dehkhoda, Fahimeh, Javad Frounchi, and Mohammad Mohammadzadeh. "INVESTIGATION OF MAGNETIC RESONANCE SURFACE MICROCOILS USING FINITE ELEMENT SIMULATIONS." Biomedical Engineering: Applications, Basis and Communications 24, no. 05 (October 2012): 377–82. http://dx.doi.org/10.4015/s1016237212500330.

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Surface microcoils are utilized in micro magnetic resonance imaging and spectroscopy for the purpose of resolution enhancement and small sample analysis. In this work, modeling and investigation of surface microcoils are conducted using finite element simulations in COMSOL Multiphysics and post-processing. The method is based on MR signal generating by employing the principle of reciprocity to obtain signal sensitivity and signal-to-noise ratio (SNR) in surface microcoils. Filling factor is investigated as an effective coil parameter to show its great effect on sensitivity and SNR where the results confirm that maximum SNR can be achieved with optimum parameters when the filling factor is high enough. Regarding the great interest on MR coil optimization and microcoil array design, the findings can facilitate the optimization and design process by focusing on the most effective parameters to achieve the desired specifications in an accurate and time-saving manner.

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Bouraoui, Chaima, and Fayçal Ben Nejma. "Numerical study of the greenhouse solar drying of olive mill wastewater under different conditions." Advances in Mechanical Engineering 12, no. 4 (April 2020): 168781401988974. http://dx.doi.org/10.1177/1687814019889748.

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The aim of this work is to develop thermal modeling of the olive mill wastewater drying process in a greenhouse solar dryer. A configuration was thus proposed and simulated using the commercial software COMSOL Multiphysics in order to solve the conservation equations governing our problem. The resulting simulations are used to evaluate the temperature, velocity, and vapor mass fraction distributions after hours of sunshine and to provide a quantification of the drying process. The influence of the greenhouse effect on the drying kinetics is highlighted by comparing to open sun-drying results. The effect of some greenhouse geometric characteristics and external meteorological conditions are studied.

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Ivanova, E. A., and D. N. Mikhailov. "Modeling the spectral features of acoustic noise produced by gas flow in rock samples based on the theory of ensemble of interconnected pore resonators." Физика Земли, no. 3 (May 10, 2019): 126–34. http://dx.doi.org/10.31857/s0002-333720193126-134.

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A new model describing the pore space as an ensemble of interconnected Helmholtz resonators is proposed. This model makes it possible to improve the description of spectral peculiarities of the experimentally recorded acoustic noise during gas flow through a porous medium. The results of the resonance frequency calculation are presented by the example of the pore space model of the Indiana Limestone. Microvortexes in the pores are considered as the main mechanism of acoustic noise generation by gas flow. The presented numerical simulations on COMSOL Multiphysics show that the generation of microvortexes begins when the Reynolds number in the pores reaches 1 to 10.

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Mohiuddin, A. K. M. "Development of Catalytic Converter Using Non-Precious Metals." Advanced Materials Research 1115 (July 2015): 462–67. http://dx.doi.org/10.4028/www.scientific.net/amr.1115.462.

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This paper shows the uses of low cost metal for the development of catalytic converters. While bringing down the cost, attention must be paid on the performance capability of the catalytic converter. The objective of this work is to develop and design a low cost catalytic converter using copper as the main catalyst in the catalyst system. Copper powder was chosen as the alternative catalyst to reduce the use of precious group metals (PGMs) platinum, palladium, and rhodium. A spark ignition engine’s catalytic converter has to perform the oxidation of CO, oxidation of HC and reduction of NOxsimultaneously in order to satisfy its performance requirement. These three chemical reactions are taking place simultaneously in a three way catalytic converter. To investigate the chemical kinetics and fluid flow characteristics of a catalytic converter, simulations have been carried out using COMSOL. From COMSOL MULTIPHYSICS, catalytic converter’s velocity field and pressure distribution have been simulated. From COMSOL REACTION ENGINEERING LAB, NO and CO concentration from a catalytic converter kinetics model have been plotted. NO and CO conversion for different air to fuel ratio had shown that for rich mixture, NO reduction reaches its maximum but CO oxidation is at its minimum. In lean mixture, CO oxidation is at its maximum but NO reduction is at its minimum. Simulations have shown the actual characteristics of the catalytic converter performance. The flow throughout catalytic converter and the backpressure have successfully determined and the catalyst conversion efficiency also shown clearly.

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Akter, Ferdusee, Md Bhuyan, and Ujjwal Deb. "Simulation of the Effect of Oil Volume Fractions in an Oil-Water Flows Along a Circular Pipe: A Finite Element Approach." Journal of Mathematics Research 10, no. 5 (July 9, 2018): 19. http://dx.doi.org/10.5539/jmr.v10n5p19.

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Two phase flows in pipelines are very common in industries for the oil transportations. The aim of our work is to observe the effect of oil volume fraction in the oil in water two phase flows. The study has been accomplished using a computational model which is based on a Finite Element Method (FEM) named Galerkin approximation. The velocity profiles and volume fractions are performed by numerical simulations and we have considered the COMSOL Multiphysics Software version 4.2a for our simulation. The computational domain is 8m in length and 0.05m in radius. The results show that the velocity of the mixture decreases as the oil volume fraction increases. It should be noted that if we gradually increase the volume fractions of oil, the fluid velocity also changes and the saturated level of the volume fraction is 22.3%.

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Yudong, Hou, Huang Saipeng, Han Jian, Liu Xingbin, Han Lianfu, and Fu Changfeng. "Numerical Simulation of the Effect of Injected CO2 Temperature and Pressure on CO2-Enhanced Coalbed Methane." Applied Sciences 10, no. 4 (February 19, 2020): 1385. http://dx.doi.org/10.3390/app10041385.

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The injection of CO2 to displace CH4 in coal seams is an effective method to exploit coalbed methane (CBM), for which the CO2 injection temperature and pressure are important influential factors. We performed simulations, using COMSOL Multiphysics to determine the effect of CO2 injection temperature and pressure on CO2-enhanced coalbed methane (CO2-ECBM) recovery, according to adsorption/desorption, seepage, and diffusion of binary gas (CO2 and CH4) in the coal seam, and deriver a thermal–hydraulic–mechanical coupling equation of CO2-ECBM. The simulation results show that, as CO2 injection pressure in CO2-ECBM increases, the molar concentration and displacement time of CH4 in the coal seam significantly decrease. With increasing injection temperature, the binary gas adsorption capacity in the coal seam decreases, and CO2 reserves and CH4 production decrease. High temperatures are therefore not conducive for CH4 production.

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Otmani, Abdessalam, Hocine Mzad, and Kamel Bey. "A thermal parametric study of non-evaporative spray cooling process." MATEC Web of Conferences 240 (2018): 01030. http://dx.doi.org/10.1051/matecconf/201824001030.

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Ordinary water spray cooling is connected with very high temperatures where heat transfer during evaporation plays a key role. However, during cooling without phase change, the behaviour of the spray cooling parameters is rarely considered. The purpose of this paper is to study the influence of spray hydrodynamic parameters on heat transfer without liquid phase change during the cooling of an aluminium 3003-H18 plate at a temperature of 92 °C. First of all, the flow rate was varied from 0.497 up to 1 l/min. Then, the inlet pressure varied from 0.7 to 2.1 bars. The influence of nozzle-to-target distance is also tested since the simulations were carried out in a wide height range, from 100 mm to 505 mm. The present simulation was achieved using the version 5.2 of COMSOL Multiphysics code.

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Bielnicki, M., J. Jowsa, and A. Cwudziński. "Multiphase Numerical Model of Molten Steel and Slag Behavior in the Continuous Casting Mould." Archives of Metallurgy and Materials 60, no. 1 (April 1, 2015): 257–62. http://dx.doi.org/10.1515/amm-2015-0041.

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AbstractThe paper reports the results of numerical simulation of the flow of liquid steel with the use of a multiphase model. The facility under study was a mould designed for continuous casting of steel slabs. The geometry of the facility, along with the computational grid, was generated within the program Ansys-MeshingR. Numerical computations were performed in the programs: COMSOL Multiphysics¯ and Ansys-Fluent¯. The use of the multiphase model enabled the determination of the behavior of the liquid slag layer on the metal bath surface. From the performed computer simulations, the fields of liquid steel motion and liquid steel turbulence kinetic energy distribution in the mould's symmetry plane have been presented. Based on the values recorded at selected measurement points located on the slag surface, a diagram illustrating the variation of the slag layer position during continuous steel casting has been plotted.

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Pachkawade, Vinayak. "Precise Design of Micro-Cantilever Sensor for Biomedical Application." Sensor Letters 18, no. 12 (December 1, 2020): 900–904. http://dx.doi.org/10.1166/sl.2020.4305.

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This research evaluates the impact of mass loading/perturbations on the characteristics of a micro-size cantilever bio-mass sensor. Design techniques are proposed through the application of the commercial, finite element modelling, and simulation package, i.e., COMSOL multiphysics. A finite element model and resulting simulations are provided for both the static and dynamic operation of a bio-mass sensor. In static mode, the obtained result provides the structural stress, strain, and displacement of a sensor against several mass loading conditions (point, edge, and boundary). In dynamic mode, shifts in the resonant frequencies of the sensor as a function of mass loading are obtained, which is another viable output of the biosensor. The proposed design and modelling techniques offer a guide in the rapid design and development of precise and efficient biomedical instrumentations and/or products.

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Pishkoo, Amir, and Maslina Darus. "Using Fractal Calculus to Solve Fractal Navier–Stokes Equations, and Simulation of Laminar Static Mixing in COMSOL Multiphysics." Fractal and Fractional 5, no. 1 (February 8, 2021): 16. http://dx.doi.org/10.3390/fractalfract5010016.

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Navier–Stokes equations describe the laminar flow of incompressible fluids. In most cases, one prefers to solve either these equations numerically, or the physical conditions of solving the problem are considered more straightforward than the real situation. In this paper, the Navier–Stokes equations are solved analytically and numerically for specific physical conditions. Using Fα-calculus, the fractal form of Navier–Stokes equations, which describes the laminar flow of incompressible fluids, has been solved analytically for two groups of general solutions. In the analytical section, for just “the single-phase fluid” analytical answers are obtained in a two-dimensional situation. However, in the numerical part, we simulate two fluids’ flow (liquid–liquid) in a three-dimensional case through several fractal structures and the sides of several fractal structures. Static mixers can be used to mix two fluids. These static mixers can be fractal in shape. The Sierpinski triangle, the Sierpinski carpet, and the circular fractal pattern have the static mixer’s role in our simulations. We apply these structures just in zero, first and second iterations. Using the COMSOL software, these equations for “fractal mixing” were solved numerically. For this purpose, fractal structures act as a barrier, and one can handle different types of their corresponding simulations. In COMSOL software, after the execution, we verify the defining model. We may present speed, pressure, and concentration distributions before and after passing fluids through or out of the fractal structure. The parameter for analyzing the quality of fractal mixing is the Coefficient of Variation (CoV).

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Plong-Ngooluam, Sayan, Nattha Jindapetch, Phairote Wounchoum, and Duangporn Sompongse. "3-D Computational Simulations of Electrostatic Potential in Partial Surfaces towards the Precision of Ion Balance Analysis." Applied Mechanics and Materials 781 (August 2015): 308–11. http://dx.doi.org/10.4028/www.scientific.net/amm.781.308.

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This paper reports a 3-D computational simulation of electrostatic potential uniformity which was affected by various measurement plates. The finite element analysis method has been done by COMSOL Multiphysics to model the electrostatic potential behavior. The electrostatic potential from two electrodes in the free space plane has been modeled and used as a reference result to compare with the electrostatic potential results of four various measurement plates including the standard 6"x6" charged plate and its dividing by four, nine and sixteen segments. This investigation revealed the uniformity error of the electrostatic potential from the conventional plate. The precision of ion balance analysis can be improved by the using of a partial surface, i.e. by dividing the conventional plate into smaller sizes.

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Wang, Haopeng, Yue Zhang, Yi Zhang, Shuyin Feng, Guoyang Lu, and Lintao Cao. "Laboratory and Numerical Investigation of Microwave Heating Properties of Asphalt Mixture." Materials 12, no. 1 (January 4, 2019): 146. http://dx.doi.org/10.3390/ma12010146.

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Microwave heating is an encouraging heating technology for the maintenance, recycling, and deicing of asphalt pavement. To investigate the microwave heating properties of asphalt mixture, laboratory tests and numerical simulations were done and compared. Two types of Stone Mastic Asphalt (SMA) mixture samples (with basalt aggregates and steel slag aggregates) were heated using a microwave oven for different times. Numerical simulation models of microwave heating of asphalt mixture were developed with finite element software COMSOL Multiphysics. The main thermal and electromagnetic properties of asphalt mixture, served as the model input parameters, were measured through a series of laboratory tests. Both laboratory-measured and numerical simulated surface temperatures were recorded and analyzed. Results show that the replacement of basalt aggregates with steel slag aggregates can significantly increase the microwave heating efficiency of asphalt mixture. Numerical simulation results have a good correlation with laboratory test results. It is feasible to use the developed model coupling electromagnetic waves with heat transfer to simulate the microwave heating process of asphalt mixture.

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Modarres-Gheisari, S. M. M., M. Mohammadpour, R. Gavagsaz-Ghoachani, P. Safarpour, and M. Zandi. "Edge Fillet Radius Effect on Acoustic Energy in an Ultrasonic Microcontainer for Preparing Nanoemulsion." Acta Acustica united with Acustica 105, no. 6 (November 1, 2019): 1243–50. http://dx.doi.org/10.3813/aaa.919401.

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Nanoemulsion preparation and improvement play a pivotal role in the area of pharmaceuticals, food, mechanical, and chemical engineering. The ultrasonic technique is one of the most commonly used methods in preparing nanoemulsion, related to mechanical and electrical engineering. The present study aimed to evaluate the effect of edge fillet radius in four different layouts of a cubic ultrasonic microcontainer at different frequencies through 36 simulations by using COMSOL Multiphysics software. To this aim, the simulations were performed in three edge fillet radius values of zero, 2.5 and 5 mm, and at the excitation frequencies of 20, 200 and 300 kHz. In this regard, experimental tests were carried out in two modes of: a) regular ultrasonic bath (RUB) and b) filleted-edges ultrasonic bath (FEUB). Based on the simulation and experimental results, the removal of sharp edges has a positive influence on propagating waves, leading to an increase in the acoustic energy density at different frequencies and the effect was more significant at lower frequencies and layouts with more PZTs.

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Voznesensky, A. S., and L. K. Kidima-Mbombi. "Formation of synthetic structures and textures of rocks when simulating in COMSOL Multiphysics." Gornye nauki i tekhnologii = Mining Science and Technology (Russia) 6, no. 2 (July 14, 2021): 65–72. http://dx.doi.org/10.17073/2500-0632-2021-2-65-72.

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Rock texture and structure play an important role in the formation of the rock physical properties, and also carry information about their genesis. The paper deals with the simulation of geometric shapes of various structures and textures of rocks by the finite-element method (FEM). It is carried out by programmed detailing of the element properties and their spatial location in the simulated object. When programming structures, it is also possible to set the physical properties of various parts of the model, grids, initial and boundary conditions, which can be changed in accordance with the scenarios for numerical experiments. In this study, on the basis of FEM, simulation of various structures and textures of rocks with inclusions and disruptions was implemented in COMSOL Multiphysics in conjunction with Matlab. Such structures are used to conduct computer generated simulations to determine physical properties of geomaterials and study the effect on them of agents of various physical nature. The building of several models was considered: a rock specimen with inclusions in the form of ellipses of equal dimensions with different orientations; a sandstone specimen containing inclusions with high modulus of elasticity in cement matrix when deforming; a limestone specimen with fractures filled with oil and saline water when determining its specific electrical resistance. As an example of a fractured structure analysis, the influence of the filler on the electrical resistance of the limestone specimen containing a system of thin elliptical predominantly horizontal fractures was considered. The change in the lines of current flow at different ratios between the matrix and the fracture filler conductivities and their effect on the effective (averaged) conductivity of the rock specimen was clearly demonstrated. The lower conductivity of the fracture filler leads to increasing the length and decreasing the cross-section of the current flow lines that, in turn, leads to significant decrease in the conductivity of the fractured rock specimen. The higher filler conductivity results in a slight increase in the conductivity of the fractured specimen compared to that of the homogeneous isotropic specimen. The resulting structures can be used for numerical experiments to study physical properties of rocks.

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Journal articles on the topic 'COMSOL Multiphysics simulations'

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