Relevant bibliographies by topics / COMSOL- 3D-simulation

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'COMSOL- 3D-simulation'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "COMSOL- 3D-simulation"

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TONG, Lizhu. "J056054 3D Simulation of Jet Flow using COMSOL Multiphysics." Proceedings of Mechanical Engineering Congress, Japan 2011 (2011): _J056054–1—_J056054–2. http://dx.doi.org/10.1299/jsmemecj.2011._j056054-1.

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Lanin, V. L., V. T. Pham, and A. I. Lappo. "Through-silicon-via formation of 3D electronic modules by laser radiation." Doklady BGUIR 19, no. 3 (June 2, 2021): 58–65. http://dx.doi.org/10.35596/1729-7648-2021-19-3-58-65.

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Laser heating is a promising method for through-silicon-via (TSV) formation in assembling highdensity 3D electronic modules due to its high specific energy and local heating ability. Using laser radiation for the formation of TSV makes it possible to reduce its diameter, indirectly increases the density of elements in 3D electrical modules. Laser system selection depends on the physical and mechanical properties of the processed materials and on the technical requirements for laserprocessing. The reflectivity of most materials increases with the laser wavelength. It was found that with an increase in the initial temperature of the substrate, the TSV taper becomes larger. Simulation was performed in COMSOL Multiphysics 5.6 to conduct thermal distribution during TSV laser formation. By modeling thermal fields in the COMSOL Multiphysics 5.6 software for laser processing of silicon substrates and experimental studies, the parameters of laser radiation have been optimized to obtain a minimum hole taper coefficient in the substrates of 3D electronic modules. The optimal duration of exposure to laser radiation with a wavelength of 10.64 microns is less than 2 s with holes taper 0.1–0.2.
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Ismail, Zuhaila, Lim Yeou Jiann, Sabaruddin Ahmad Jamali, and Alistair Fitt. "Simulation of AH flows and deformation of DMD in a 3D AC." Malaysian Journal of Fundamental and Applied Sciences 13, no. 4-1 (December 5, 2017): 362–66. http://dx.doi.org/10.11113/mjfas.v13n4-1.898.

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This paper presents the interaction between the aqueous humour (AH) flows and the deformation of Descemet membrane detachment (DMD) in a 3D anterior chamber (AC). Arbitrary Lagrangian Eulerian (ALE) method is used to model the problem. Finite element method using COMSOL Multiphysics software is adopted to solve the governing equations for the AH flows and the deformation of DMD. The fluid flow behaviour and the deformation of the detached Descemet membrane are analysed in order to comprehend the progression of the DMD in the AC due to the AH flows and vice versa. The re-attachment or re-detachment of the DMD is significantly affected by the AH flows. Advance treatment for the DMD can be developed based on a better understanding of the interaction between the AH flows and the DMD.
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Ara, Iffat. "Numerical simulation of mathematical heart model in COMSOL." International Journal of Engineering & Technology 9, no. 1 (January 23, 2020): 77. http://dx.doi.org/10.14419/ijet.v9i1.30052.

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Electrical activity is essential for the cardiac cell to perform its function. Mathematical modeling of cardiac electrical activity is performed from the cell, tissue and organ levels through to the body surface level. The electrical activity of the cardiac as a whole is thus characterized by a complex multiscale structure. The most complete model of such a complex setting is the anisotropic bidomain model that consists of a system of two degenerate parabolic reaction diffusion equations describing the intra and extracellular potentials in the cardiac muscle, coupled with a system of ordinary deferential equations describing the ionic currents flowing through the cellular membrane. This study describes an anatomically realistic 3D Bidomain model of whole-heart electrical activity. The heart was embedded in a human torso, incorporating spontaneous activation with heterogeneous action potential (AP) morphologies throughout the heart. The aim of this study is the development of a geometrically simple and computationally efficient 3D model of heart. In this paper a finite element formulation, model and simulation of Bidomain equation has been conducted. The FitzHugh-Nagumo (FHN) equations were incorporated into Bidomain model of cardiac electrical activity, which was comprised of a simplified geometry of the whole heart with the torso as an extracellular volume conductor. Laplace equation for the torso also considered. Simplified 3D cardiac model was implemented using COMSOL Multiphysics 5.0 finite element software. Electrical potential at different point on torso is measured. Propagation of electrical excitation on heart surface is also observed. This study represents the first stage toward the development of an accurate computer model of heart activation.
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Bashir, Imran, and Michael Carley. "Development of 3D boundary element method for the simulation of acoustic metamaterials/metasurfaces in mean flow for aerospace applications." International Journal of Aeroacoustics 19, no. 6-8 (September 3, 2020): 324–46. http://dx.doi.org/10.1177/1475472x20954423.

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Low-cost airlines have significantly increased air transport, thus an increase in aviation noise. Therefore, predicting aircraft noise is an important component for designing an aircraft to reduce its impact on environmental noise along with the cost of testing and certification. The aim of this work is to develop a three-dimensional Boundary Element Method (BEM), which can predict the sound propagation and scattering over metamaterials and metasurfaces in mean flow. A methodology for the implementation of metamaterials and metasurfaces in BEM as an impedance patch is presented here. A three-dimensional BEM named as BEM3D has been developed to solve the aero-acoustics problems, which incorporates the Fast Multipole Method to solve large scale acoustics problems, Taylor’s transformation to account for uniform and non-uniform mean flow, impedance and non-local boundary conditions for the implementation of metamaterials. To validate BEM3D, the predictions have been benchmarked against the Finite Element Method (FEM) simulations and experimental data. It has been concluded that for no flow case BEM3D gives identical acoustics potential values against benchmarked FEM (COMSOL) predictions. For Mach number of 0.1, the BEM3D and FEM (COMSOL) predictions show small differences. The difference between BEM3D and FEM (COMSOL) predictions increases further for higher Mach number of 0.2 and 0.3. The increase in difference with Mach number is because Taylor’s Transformation gives an approximate solution for the boundary integral equation. Nevertheless, it has been concluded that Taylor’s transformation gives reasonable predictions for low Mach number of up to 0.3. BEM3D predictions have been validated against experimental data on a flat plate and a duct. Very good agreement has been found between the measured data and BEM3D predictions for sound propagation without and with the mean flow at low Mach number.
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Pettersen, Fred-Johan, and Jan Olav Høgetveit. "From 3D tissue data to impedance using Simpleware ScanFE+IP and COMSOL Multiphysics – a tutorial." Journal of Electrical Bioimpedance 2, no. 1 (July 23, 2019): 13–32. http://dx.doi.org/10.5617/jeb.173.

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Abstract Tools such as Simpleware ScanIP+FE and COMSOL Multiphysics allow us to gain a better understanding of bioimpedance measurements without actually doing the measurements. This tutorial will cover the steps needed to go from a 3D voxel data set to a model that can be used to simulate a transfer impedance measurement. Geometrical input data used in this tutorial are from MRI scan of a human thigh, which are converted to a mesh using Simpleware ScanIP+FE. The mesh is merged with electrical properties for the relevant tissues, and a simulation is done in COMSOL Multiphysics. Available numerical output data are transfer impedance, contribution from different tissues to final transfer impedance, and voltages at electrodes. Available volume output data are normal and reciprocal current densities, potential, sensitivity, and volume impedance sensitivity. The output data are presented as both numbers and graphs. The tutorial will be useful even if data from other sources such as VOXEL-MAN or CT scans are used.
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Pham, Khuong Thi Thao. "10 MHz Ultrasound Linear Array Design for Medical Application." Journal of Science and Technology: Issue on Information and Communications Technology 17, no. 12.2 (December 9, 2019): 1. http://dx.doi.org/10.31130/ict-ud.2019.90.

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This report represents a design and simulation of 10 MHz ultrasound transducer for medical application. The array is designed with 64 elements of 50µm width, 25µm kerf and 1mm elevation for each element. This results in the total transducer dimension of 1mm x 4.8mm. Piezoelectric material PZT 5H is chosen as the active layer while commercial materials named Ecosorb-MF116 and Polystyrene Fostarene-50 are chosen as two matching layers. Transducer’s 1D model using XTrans design toolbox and 3D FEM Comsol models (charge and voltage control) are investigated both accounted the effect of the 500nm electrode layers. Single element and array beam forming are calculated using Field II. A simulation of phantom imaging is observed using the transducer.
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Cui, Jun Hua, Wei Xu, and Zheng Hua Guo. "Coupled Thermo-Flowing 3D Steady State Model of Friction Stir Welding Process." Applied Mechanics and Materials 470 (December 2013): 325–29. http://dx.doi.org/10.4028/www.scientific.net/amm.470.325.

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The coupled thermo-flowing 3D steady-state model of friction stir welding model is established based on fluid mechanics. With analyzing the impact of pin shoulder and pin on heat producing, the model considers the influence of pin on the heat producing processing. The model applies viscoplastic constitutive equations to describe the material, and turbulence model to simulate the material flowing behavior. With the additional turbulence kinetic energy equations and flow boundary condition equations, the model is established. With Comsol Multiphysics finite analysis software, a process simulation was carried out, and the results reflect that the model can reveal the steady state characteristics of thermo and material flowing behavior of friction stir welding.
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Sun, Quan, Zong Fu Jiang, and Edmond Cretu. "Simulation and Characterization of a Novel Large Stroke Micromirror." Advanced Materials Research 403-408 (November 2011): 3411–17. http://dx.doi.org/10.4028/www.scientific.net/amr.403-408.3411.

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This paper reports on the simulation and characterization of a microelectromechanical system (MEMS) micromirror fabricated with PolyMUMPs. The overall diameter of the hexagonal micrimirror, including mirror plate and 3 supporting cantilevers fixed around, is 450um. A 3D model is built in finite element method (FEM) with COMSOL. Simulations of the elevated height of mirror plate, pull-in voltage and eigenfrequency of the micromirror are carried out. The static and dynamic performances of the fabricated micromirror are characterized by Veeco Optical Profiler and Polytek MEMS System Analyzer. The comparison between measurement and simulation exhibits good concordance. Surface topography measurement shows the elevated height and stress-induced concave deformation of mirror plate almost the same scale as demonstrated in FEM simulation. The Pull-In voltages are measured to be around 32V in current-voltage curve which is almost the same as in FEM simulation with one electrode biased. The fundamental resonant frequency is measured to be 4.3k Hz in torsional motion and 4.9k Hz in piston motion.
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Zhang, Shiwei, Ninghua Kong, Yufang Zhu, Zhijun Zhang, and Chenghai Xu. "3D Model-Based Simulation Analysis of Energy Consumption in Hot Air Drying of Corn Kernels." Mathematical Problems in Engineering 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/579452.

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To determine the mechanism of energy consumption in hot air drying, we simulate the interior heat and mass transfer processes that occur during the hot air drying for a single corn grain. The simulations are based on a 3D solid model. The 3D real body model is obtained by scanning the corn kernels with a high-precision medical CT machine. The CT images are then edited by MIMICS and ANSYS software to reconstruct the three-dimensional real body model of a corn kernel. The Fourier heat conduction equation, the Fick diffusion equation, the heat transfer coefficient, and the mass diffusion coefficient are chosen as the governing equations of the theoretical dry model. The calculation software, COMSOL Multiphysics, is used to complete the simulation calculation. The influence of air temperature and velocity on the heat and mass transfer processes is discussed. Results show that mass transfer dominates during the hot air drying of corn grains. Air temperature and velocity are chosen primarily in consideration of mass transfer effects. A low velocity leads to less energy consumption.
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Dissertations / Theses on the topic "COMSOL- 3D-simulation"

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Michael, Pratheek. "Simulation Studies on ECG Vector Dipole Extraction in Liquid Medium." Scholar Commons, 2017. http://scholarcommons.usf.edu/etd/6625.

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To circumvent some inherent problems in the conventional ECG, this research reinvestigates an ‘unassisted’ approach which enables ECG measurement without the placement of leads on the body. Employed in this research is a widely accepted assumption that the electrical activity of the heart may be represented, largely, by a 3-D time-varying current dipole (3D-CD). From the PhysioBank database, mECG and fECG data were obtained, and Singular Value Decomposition (SVD) was performed to estimate the time-varying Vector ECG dipole. To determine the sensing matrix responsible for transforming the activity of the 3D-CD into the potential distribution on the surface of the medium, the ECG vector dipole signals are used to excite a 3D-CD in water medium of a specific shape-containing-ellipsoid model(s) in COMSOL tool. The sensing matrix thereby estimated is then utilized to reconstruct the 3D-CD signals from the signals measured by the probes on the surface of the medium. Fairly low NRMSEs (Normalized Root-Mean-Squared Errors) are attained. The approach is also successfully extended to the case of two ellipsoids, one inside the other, representing a pregnant female subject. Low NRMSEs (Normalized Root-Mean-Squared Errors) are again observed.
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Uth, Nicholas P. "Computational Design and Optimization of Bone Tissue Engineering Scaffold Topology." Miami University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=miami1452783077.

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Magnusson, Alexander Erik. "Modelling of battery cooling for Formula Student application : 3D Simulation of air cooled lithium-ion battery with COMSOL Multiphysics®, applied on 2016 years KTH Formula Student car “EV12e”." Thesis, KTH, Energiteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192556.

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Electric and hybrid cars is one of the technologies to reduce the uses of fossil fuel. What is common with an electric car and a hybrid car is the use of battery to store electrical energy. To sustain high performance, long lifetime and to keep high safety in an electric vehicle it’s very important to control the temperature of the battery cells. Therefore it’s important to have a sufficient and well-designed cooling system that can keep the battery cells within recommended temperature range when the car is driving. In this thesis, battery cooling and battery heat generation in the KTH formula student car “EV12e” are simulated and analyzed. The first part is to modulate the heat production that can occur when driving the car at the formula student competition. The second part is analyzing predesigned air-cooling. The “Thévenin Equivalent circuit” was used as battery model with a fixed value of cells internal resistance, the heat was approximated with Joule heating and the internal chemical heating was neglected. By using logged data from last year’s car “EV11e” on Silverstone 2015, a drive cycle could be estimated for EV12e with driving time and by using a parametric study of driving behavior. To simulate the airflow and heat transfer in cooling channels the software “COMSOL Multiphysics®”. Simplified geometric structure of the battery and cooling channels were imported to the software together with parameters specified from the car “EV12e”. This data was then used to simulate the temperature changes in the battery. The result showed that the battery generates 0.8-1.4MJ heating at 500-900W, for driving time of 25 minutes and a specific driving behavior. When driving at 500W output power under outdoor temperature of 30 o C, the maximum temperature of the battery reaches 49 o C at the end of the race. If the driver uses the maximum theoretical power output, the internal heating can come up to 950W after 25 min driving and reaches temperature of 64 o C with the initial and outdoor temperature of 25 o C. The pre-designed air cooling can manage to keep the battery temperature under the maximum allowable battery cell temperature with the outdoor temperature at 25 o C or lower. If the outdoor temperature is higher than 25 o C the driver will have to consider the battery temperature when driving and should avoid quick accelerations.
Eldrivna bilar och elhybridbilar är en av de tekniska lösningarna för att minska användandet av fossila bränslen. Gemensamt för el och hybridbilar är att båda använder sig av batterier för att lagra elektrisk energi. För att erhålla bra prestanda, livslängd och säkerhet i ett eldrivet fordon är batteriernas temperatur en mycket avgörande faktor. För att undvika att temperaturen blir allt för hög i battericellerna behövs ett väldesignat kylsystem för att ta hand om värmeutvecklingen som uppstår inuti cellerna när bilen körs. I den här rapporten analyseras luftkylningen och värmeutvecklingen av högspänningsbatteriet i KTH Formulastudent bilen ”EV12e”. Arbetet är uppdelat i två delar: Första delen handlar om att göra en modell för värmeutvecklingen som uppstår i battericellerna vid tävling, andra delen utgörs av CFD med värmeöverföring och analysera om den redan designade luftkylningen är tillräcklig för att undvika överhettning under körning. I modell uppställningen för spillvärme användes Thévenin Equivalent ciruct som batterimodell och majoriteten av spillvärmen antogs komma från Ohm:isk uppvärmning. Genom att utgå från kör data med KTH Formula student bil ”EV11e” som tävlade 2015 på Silverstone kunde en modifierad körcykel för EV12e tas fram utifrån antagande om körtid och förarbeteende. För att simulera luftflöde i kylkanaler, värmeöverföring och batteriets temperatur användes simuleringar med FEM i programmet COMSOL Multiphysics®. I programmet importerades en geometrisk förenklad modell av batteriet till ”EV12e” samt in parametrar med bland annat den beräknade värmeutvecklingen. Resultatet var att batteriet genererar 0,8-1,4M Joule resistiv värme, vilket ger en genomsnittlig uppvärmning av 500-900W om körtiden antas vara 25minuter. Vid en körstill där batteriet genererar 500W spillvärme och en utomhus temperatur av 30o C blir den högsta uppmäta temperaturen 49o C efter körning. Om föraren istället använder maximala kapaciteten av batteriet kan den interna uppvärmningen bli som mest 950W vilket ger en högsta temperatur på 64o C om utomhus temperaturen är 25o C. Slutsatsen är att batteriets kylsystem klarar av att hantera värmeutveckling i batteriet för en utomhus temperaturen är som mest 25o C, om utomhustemperaturen är högre behöver förare anpassa sin körstill för att inte riskera att batterierna blir varmare än den maximala temperaturen på 65o C.
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Rastan, Hamidreza. "Investigation of the heat transfer of enhanced additively manufactured minichannel heat exchangers." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-264278.

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Mini-/microchannel components have received attention over the past few decades owing to their compactness and superior thermal performance. Microchannel heat sinks are typically manufactured through traditional manufacturing practices (milling and sawing, electrodischarge machining, and water jet cutting) by changing their components to work in microscale environments or microfabrication techniques (etching and lost wax molding), which have emerged from the semiconductor industry. An extrusion process is used to produce multiport minichannel-based heat exchangers (HXs). However, geometric manufacturing limitations can be considered as drawbacks for all of these techniques. For example, a complex out-of-plane geometry is extremely difficult to fabricate, if not impossible. Such imposed design constraints can be eliminated using additive manufacturing (AM), generally known as three-dimensional (3D) printing. AM is a new and growing technique that has received attention in recent years. The inherent design freedom that it provides to the designer can result in sophisticated geometries that are impossible to produce by traditional technologies and all for the redesign and optimization of existing models. The work presented in this thesis aims to investigate the thermal performance of enhanced minichannel HXs manufactured via metal 3D printing both numerically and experimentally. Rectangular winglet vortex generators (VGs) have been chosen as the thermal enhancement method embedded inside the flat tube. COMSOL Multiphysics, a commercial software package using a finite element method (FEM), has been used as a numerical tool. The influence of the geometric VG parameters on the heat transfer and flow friction characteristics was studied by solving a 3D conjugate heat transfer and laminar flow. The ranges of studied parameters utilized in simulation section were obtained from our previous interaction with various AM technologies including direct metal laser sintering (DMLS) and electron-beam melting (EBM). For the simulation setup, distilled water was chosen as the working fluid with temperaturedependent thermal properties. The minichannel HX was assumed to be made of AlSi10Mg with a hydraulic diameter of 2.86 mm. The minichannel was heated by a constant heat flux of 5 Wcm−2 , and the Reynolds number was varied from 230 to 950. A sensitivity analysis showed that the angle of attack, VG height, VG length, and longitudinal pitch have notable effects on the heat transfer and flow friction characteristics. In contrast, the VG thickness and the distance from the sidewalls do not have a significant influence on the HX performance over the studied range. On the basis of the simulation results, four different prototypes including a smooth channel as a reference were manufactured with AlSi10Mg via DMLS technology owing to the better surface roughness and greater design uniformity. A test rig was developed to test the prototypes. Owing to the experimental facility and working fluid (distilled water), the experiment was categorized as either a simultaneously developing flow or a hydrodynamically developed but thermally developing flow. The Reynolds number ranged from 175 to 1370, and the HX was tested with two different heat fluxes of 1.5 kWm−2 and 3 kWm−2 . The experimental results for the smooth channel were compared to widely accepted correlations in the literature. It was found that 79% of the experimental data were within a range of ±10% of the values from existing correlations developed for the thermal entry length. However, a formula developed for the simultaneously developing flow overpredicted the Nusselt number. Furthermore, the results for the enhanced channels showed that embedding VGs can considerably boost the thermal performance up to three times within the parameters of the printed parts. Finally, the thermal performance of the 3D-printed channel showed that AM is a promising solution for the development of minichannel HXs. The generation of 3D vortices caused by the presence of VGs ii can notably boost the thermal performance, thereby reducing the HX size for a given heat duty.
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(8771429), Ashley S. Dale. "3D OBJECT DETECTION USING VIRTUAL ENVIRONMENT ASSISTED DEEP NETWORK TRAINING." Thesis, 2021.

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An RGBZ synthetic dataset consisting of five object classes in a variety of virtual environments and orientations was combined with a small sample of real-world image data and used to train the Mask R-CNN (MR-CNN) architecture in a variety of configurations. When the MR-CNN architecture was initialized with MS COCO weights and the heads were trained with a mix of synthetic data and real world data, F1 scores improved in four of the five classes: The average maximum F1-score of all classes and all epochs for the networks trained with synthetic data is F1∗ = 0.91, compared to F1 = 0.89 for the networks trained exclusively with real data, and the standard deviation of the maximum mean F1-score for synthetically trained networks is σ∗ F1 = 0.015, compared to σF 1 = 0.020 for the networks trained exclusively with real data. Various backgrounds in synthetic data were shown to have negligible impact on F1 scores, opening the door to abstract backgrounds and minimizing the need for intensive synthetic data fabrication. When the MR-CNN architecture was initialized with MS COCO weights and depth data was included in the training data, the net- work was shown to rely heavily on the initial convolutional input to feed features into the network, the image depth channel was shown to influence mask generation, and the image color channels were shown to influence object classification. A set of latent variables for a subset of the synthetic datatset was generated with a Variational Autoencoder then analyzed using Principle Component Analysis and Uniform Manifold Projection and Approximation (UMAP). The UMAP analysis showed no meaningful distinction between real-world and synthetic data, and a small bias towards clustering based on image background.

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Book chapters on the topic "COMSOL- 3D-simulation"

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Morales, Edith Obregón, José de Jesús Pérez Bueno, Juan Carlos Moctezuma Esparza, Diego Marroquín García, Arturo Trejo Pérez, Roberto Carlos Flores Romero, Juan Manuel Olivares Ramírez, et al. "3D Scanning and Simulation of a Hybrid Refrigerator Using Photovoltaic Energy." In Encyclopedia of Information Science and Technology, Fourth Edition, 1277–96. IGI Global, 2018. http://dx.doi.org/10.4018/978-1-5225-2255-3.ch110.

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In this chapter, a methodology that starts from the measurement and recording of real prototype geometries up to simulations to evaluate parameters, improvements or performance under various conditions is proposed. Here it is presented a case study of a solar powered refrigerator with storage capacity for 50 kg of fruit. The refrigerator comprises two systems, vapor-compression and Peltier. The methodology consisted in acquiring by a 3D laser scanner or Coordinate Measuring Machine (CMM) and in some small complex items using a 3D photogrammetry scanner. These data were transferred first as a CAD or SolidWorks® geometry and subsequently transferred to domains geometry useful for ANSYS or COMSOL simulation software. These models with high-resolution brings the simulations closer to real prototypes. As a source of direct information from the prototypes, thermal images obtained using a thermographic camera were taken. Also, wireless sensors were installed for temperature and humidity monitoring. The analyses of the energy efficiencies of both prototypes were performed.
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Morales, Edith Obregón, José de Jesús Pérez Bueno, Juan Carlos Moctezuma Esparza, Diego Marroquín García, Arturo Trejo Pérez, Roberto Carlos Flores Romero, Juan Manuel Olivares Ramírez, et al. "3D Scanning and Simulation of a Hybrid Refrigerator Using Photovoltaic Energy." In Advanced Methodologies and Technologies in Artificial Intelligence, Computer Simulation, and Human-Computer Interaction, 312–36. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7368-5.ch024.

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In this chapter, a methodology that starts from the measurement and recording of real prototype geometries up to simulations to evaluate parameters, improvements, or performance under various conditions is proposed. Here a case study of a solar powered refrigerator with storage capacity for 50 kg of fruit is presented. The refrigerator comprises two systems: vapor-compression and Peltier. The methodology consisted in acquiring by a 3D laser scanner or coordinate measuring machine (CMM) and in some small complex items using a 3D photogrammetry scanner. These data were transferred first as a CAD or SolidWorks® geometry and subsequently transferred to domains geometry useful for ANSYS or COMSOL simulation software. These models with high-resolution brings the simulations closer to real prototypes. As a source of direct information from the prototypes, thermal images obtained using a thermographic camera were taken. Also, wireless sensors were installed for temperature and humidity monitoring. The analyses of the energy efficiencies of both prototypes were performed.
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Roßmann, Jürgen, Martin Hoppen, and Arno Bücken. "GML-Based Data Management and Semantic World Modelling for a 4D Forest Simulation and Information System." In Geospatial Intelligence, 423–42. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8054-6.ch020.

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Various types of 3D simulation applications benefit from realistic forest models. They range from flight simulators for entertainment to harvester simulators for training and tree growth simulations for research and planning. This paper's 4D forest simulation and information system integrates the necessary methods for data extraction, modelling and management. Using modern methods of semantic world modelling, tree data can efficiently be extracted from remote sensing data. The derived forest models contain position, height, crown volume, type and diameter of each tree. This data is modelled using GML-based data models to assure compatibility and exchangeability. ForestGML is the name of a new schema family developed to provide a common basis for forestry data. A flexible approach for database synchronization is used to manage the data and provide caching, persistence, a central communication hub for change distribution, and a versioning mechanism. Combining various simulation techniques and data versioning, the 4D forest simulation and information system can provide applications with “both directions” of the fourth dimension. This paper outlines the current state, new developments, and integration of tree extraction, data modelling, and data management. It also shows several applications realized with the system.
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Bulatov, Vasily, and Wei Cai. "More About Periodic Boundary Conditions." In Computer Simulations of Dislocations. Oxford University Press, 2006. http://dx.doi.org/10.1093/oso/9780198526148.003.0009.

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We have already used periodic boundary conditions (PBC) for the static and dynamic simulations described in Chapters 2 and 3. There, PBC were applied along one or two directions of the simulation cell. Application of PBC in all three directions holds an important advantage when one’s goal is to examine the behavior in the bulk: under fully three-dimensional (3D) PBC, the simulated solid can be free of any surfaces. By comparison, the simulations discussed in the previous chapters all contained free surfaces or artificial interfaces in the directions where PBC were not applied. Full 3D PBC are easy to implement in an atomistic simulation through the use of scaled coordinates. However, there are important technical issues specific to simulations of lattice dislocations. First, a fully periodic simulation cell can accommodate only such dislocation arrangements whose net Burgers vector is zero. Thus, the minimal number of dislocations that can be introduced in a periodic supercell is two, i.e. a dislocation dipole. Two dislocations forming a dipole are bound to interact with each other, as well as with their periodic images. Associated with these interactions are additional strain, energy, and forces whose effects can “pollute” the calculated results. The good news is that, in most cases, the artifacts of PBC can be quantified through the use of linear elasticity theory so that physical properties of dislocations can be accurately extracted. Given the simplicity and robustness of PBC, the extrawork required to extract physical results is well worth it. This chapter describes how to evaluate and eliminate the artifacts that inevitably appear when 3D PBC are used for atomistic simulations of dislocations. In the following three sections, we show how to take full advantage of PBC when one wants to calculate the displacement field induced by a dislocation (Section 5.1), the dislocation’s core energy (Section 5.2) and Peierls stress (Section 5.3). The common theme for all three case studies is an attempt to construct a solution of the elasticity equations in a periodic domain by superimposing a periodic array of solutions of an infinite domain.
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Conference papers on the topic "COMSOL- 3D-simulation"

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Degtyarev, S. A., V. V. Podlipnov, Payal Verma, and S. N. Khonina. "3D simulation of silicon micro-ring resonator with Comsol." In The International Conference on Micro- and Nano-Electronics 2016, edited by Vladimir F. Lukichev and Konstantin V. Rudenko. SPIE, 2016. http://dx.doi.org/10.1117/12.2266783.

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Wang, Jilong, Jenny Qiu, and Shiren Wang. "3D Core-Shell Simulation of Hydrogel Swelling Behavior for Controlled Drug Delivery." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65070.

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In this paper, a three-dimensional dynamic model describing drug delivery and swelling behavior of polyelectrolyte gels was developed based on the Maxwell-Stefan equation and Bio-heat equation. COMSOL software was employed to simulate hydrogel swelling and the transportation of created automatically by COMSOL, and it had 78035 elements, which was unconcerned with the results. The results showed that Maxwell-Stefan equation and Bio-heat equation were suitable for modeling hydrogel behavior of swelling with temperature change. In addition, when temperature increased, the hydrogel swelling increased which also intensified drug release.
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Gupta, Niharika J., and S. K. Manhas. "Comsol Simulation for Optimization of micromixer parameters and its fabrication using 3D printed mold." In 2019 4th International Conference on Recent Trends on Electronics, Information, Communication & Technology (RTEICT). IEEE, 2019. http://dx.doi.org/10.1109/rteict46194.2019.9016763.

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Sarkawi, Shazwani, Zulkarnay Zakaria, Ibrahim Balkhis, Jurimah Abdul Jalil, Mohamad Aliff Abdul Rahim, Mohd Hafiz Fazalul Rahiman, Nazahah Mustafa, Ruzairi Abdul Rahim, and Zaridah Shaffie. "3D model simulation on magnetic induction spectroscopy for fetal acidosis detection using COMSOL multiphysics." In INTERNATIONAL CONFERENCE ON ADVANCED SCIENCE, ENGINEERING AND TECHNOLOGY (ICASET) 2015: Proceedings of the 1st International Conference on Advanced Science, Engineering and Technology. Author(s), 2016. http://dx.doi.org/10.1063/1.4965090.

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Zhu, Qingfu, Ziyu Zhu, and Mei He. "3D Additive Manufacturing and Micro-Assembly for Transfection of 3D-Cultured Cells and Tissues." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6567.

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3D additive manufacturing, namely 3D printing, has been increasingly needed in the fabrication of biological materials and devices. Compared to traditional fabrication, direct 3D digital transformation simplifies the manufacturing process and enhances capability in geometric fabrication. In this paper, we demonstrated a rapid and low-cost 3D printing approach for “lego” assembly of micro-structured parts as an electro-transfection device. Electro-transfection is an essential equipment for engineering and regulating cell biological functions. Nevertheless, existing platforms are mainly employed to monolayer cell suspensions in vitro, which showed more failures for translating into tissues and in vivo systems constituted by 3D cells. The knowledge regarding the three-dimensional electric transport and distribution in a tissue microenvironment is lacking. In order to bridge the gap, we assembled PDMS parts molded from 3D-printed molds as the 3D-cell culture chamber, which connects arrays of perfusion channels and electrodes. Such design allows spatial and temporal control of electric field uniformly across a large volume of 3D cells (105∼106 cells). Most importantly, multi-dimensional electric frequency scanning creates local oscillation, which can enhance mass transport and electroporation for improving transfection efficiency. The COMSOL electrostatic simulation was employed for proof of concept of 3D electric field distribution and transport in this “lego” assembled electro-transfection device, which builds the foundation for engineering 3D-cultured cells and tissues.
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Koz, Mustafa, and Satish G. Kandlikar. "A Preliminary Study for 3D Numerical Simulation of a Through-Plane Temperature Profile in a PEMFC Incorporating Coolant Channels." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73182.

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In a proton exchange membrane fuel cell (PEMFC), the water removal from the cathode to reactant flow channels is a critical aspect of cell operation. This is an active area of research to understand the transport mechanisms of water. In the available literature, it has been shown that a significant portion of the product water is removed in vapor form by the heat pipe effect through the gas diffusion layer (GDL). The intensity of the heat pipe effect is dependent on the local mean temperature and the through-plane temperature gradient across the GDL. This gradient is spatially affected by the reactant channel-land patterns of the bipolar plate (BPP) and the coolant plate operation. Therefore, the heat pipe effect can have spatial variances depending on the BPP design and cooling method. In order to show the local temperature and through-plane temperature gradient distribution in a GDL, a numerical approach was taken in this work using a commercially available software package, COMSOL Multiphysics® 4.2a. A repetitive cathode section of the PEMFC was modeled in 3D with domains of a GDL and BPP. In-plane thermal conductivity of the GDL was incorporated by using experimentally obtained values from the available literature. By changing the design and operating conditions of the coolant system, the thermal profile and so, the vapor flux across the GDL were investigated. It was found that the increasing temperature non-uniformity on coolant plates leads to less uniform distribution of vapor flux. This is expected to lead to more condensation of water vapor under the lands.
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Kim, Kyung Chun, and Dong Kim. "Numerical Simulation on the Formation of a Toroidal Microvortex by the Optoelectrokinetic Effect." In ASME 2014 12th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2014 4th Joint US-European Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icnmm2014-21439.

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Optoelectrokinetic effects were effectively used for rapid concentration of particles in microfluidics. In this study, we clarified detail mechanism of particle aggregation by numerical simulation using COMSOL v4.2a multiphysics software. A 3D simulation was conducted with axisymmetric boundary conditions. AC voltage was applied to the two parallel electrodes in a microchannel to generate temperature gradient in the fluids. In addition to the AC electrothermal (ACET) effect, local heating by a laser illumination was also considered. Numerical simulations were carried out for dielectric fluids. A toroidal microvortex induced by the optoelectrokinetic effect shows that fluid motions in the middle of bottom boundary are cancelled out by flows in opposite directions and consequently producing stagnation. It is expected that micro/nano particles can be deposited in the bottom electrode. Local heating by the laser illumination enhanced the intensity of microvortex substantially. It is confirmed that the dominant driving force for the microvortex is natural convection by the laser illumination, however AC voltage is necessary for particle aggregation in the spot area.
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Xing, Xiu Qing, Kah Wai Lum, Yan Ling Wu, and Hee Joo Poh. "Geometry Optimization for Self-Breathing PEMFC With Sequential Quadratic Programming Method." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65139.

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The strong links between COMSOL and MATLAB offers a useful option for the self-automated geometrical optimization process in PEMFC, which overcomes the difficulties on geometry optimization in Computational Fuel Cell Dynamics based design. Geometry optimization of self-breathing PEMFC, including the channel-rib ratio at anode and the open ratio at the cathode side are investigated in order to improve the fuel cell performance. A sequential quadratic programming method is selected to deal with the constrained design problem, while the objective function is calculated by running the 3D simulation script of COMSOL in the MATLAB environment. Simulation results show that for the self-breathing PEMFC operating at 353K and 1 atm with a voltage of 0.7V, when the channel-rib ratio at anode side is fixed at 10%, the optimal open ratio of the self-breathing cathode is found to be 49.8%. While, when the open ratio at the cathode is set at 80%, the optimal channel-rib ratio is located at 34.7%. However, the differences in the current density are not significant when the channel-rib ratio at the anode is varied while maintaining the open ratio at 80% for the cathode side.
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Cetin, Barbaros, Serdar Taze, Mehmet D. Asik, and S. Ali Tuncel. "Microfluidic Device for Synthesis of Chitosan Nanoparticles." In ASME 2013 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/fedsm2013-16349.

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Chitosan nanoparticles have a biodegradable, biocompatible, non-toxic structure, and commonly used for drug delivery systems. In this paper, simulation of a microfluidic device for the synthesis of chitosan nanoparticle is presented. The flow filed together with the concentration field within the microchannel network is simulated using COMSOL Multiphysics® simulation environment. Different microchannel geometries are analyzed, and the mixing performance of these configurations are compared. As a result, a 3D design for a microfluidics platform which includes four channel each of which performs the synthesis in parallel is proposed. Future research directions regarding the fabrication of the microfluidic device and experimentation phase are addressed and discussed.
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Sahin, Mervenaz, Ahmet Fatih Tabak, and Gullu Kiziltas Sendur. "Initial Study Towards the Integrated Design of Bone Scaffolds Based on Cell Diffusion, Growth Factor Release and Tissue Regeneration." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23940.

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Abstract Three-dimensional (3D) porous tissue scaffolds combined with bioactive molecules and cells offer key advantages for bone repair mechanisms. A functional bone tissue scaffold should provide mechanical support with an adequate combination of porosity and permeability for nutrients, oxygen supply, waste removal, and growth factors release as well as controlled degradation. Although a vast amount of work exist to address these challenges, to the best of our knowledge, a design framework taking tissue differentiation, diffusion, and growth factor (GF) release into account in time-domain simultaneously does not exist. In this paper, we provide an initial effort to address such a need by laying down the foundations for a simulation framework incorporating these effects within a Finite Element Analysis (FEA) model in COMSOL Multiphysics® software. The effectiveness of the numerical model is demonstrated via preliminary mechano-biology analyses on a simulated 3D poroelastic bone scaffold. Initial time-dependent results demonstrate the suitability of this model for an optimization framework. More specifically, it is demonstrated that coupled Multiphysics equations of diffusion, GF release, and differentiation could provide valuable inputs for ideal bone scaffold systems for effective bone repair tasks in the future.
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