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Journal articles on the topic 'Computational gas dynamics'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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1

Noohi, P., M. J. Abdekhodaie, and Y. L. Cheng. "Computational modeling of intraocular gas dynamics." Physical Biology 12, no. 6 (2015): 066019. http://dx.doi.org/10.1088/1478-3975/12/6/066019.

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2

Волков, К. Н., В. Н. Емельянов, and И. В. Тетерина. "Lagrangian visualization methods in computational gas dynamics." ВОЕНМЕХ. Вестник Балтийского государственного технического университета, no. 1-2 (2019): 13–22. http://dx.doi.org/10.52467/75443_2019_1-2_13.

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3

Lucas, Dirk, Iztok Tiselj, Yassin A. Hassan, and Fabio Moretti. "Computational Fluid Dynamics for Gas-Liquid Flows." Science and Technology of Nuclear Installations 2009 (2009): 1. http://dx.doi.org/10.1155/2009/725247.

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4

Pei, Jiang Hui, Zhong Di Su, and Kai Zhang. "Using Numerical Simulation to Optimize the Design of Gas Turbine Flowmeter Sensor." Advanced Materials Research 712-715 (June 2013): 1910–13. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1910.

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In order to optimize the structural design of gas turbine flowmeter sensor, numerical simulation of internal flow for gas turbine flowmeter is conducted with computational fluid dynamics method. The computation have been carried with three dimensional modeling, high quality grid resolution, dynamic grid technique and companying with the practical application of specical boundary condition.The detailed information of velocity distribution and meter factor of gas turbine flowmeter are obtained. Compared simulation results to experimental data, the relative errors are within 2.7%.
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5

Zhao, Wei, and Wei Qin. "Computational fluid dynamics optimization of gas drainage technology in gas-mining areas." Energy Exploration & Exploitation 40, no. 2 (2021): 873–86. http://dx.doi.org/10.1177/01445987211063586.

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Coal mining results in strata movement and surrounding rock failure. Eventually, manual mining space will be occupied by the destructed coal rock, making it difficult to conduct field tests of the coal seam to explore gas seepage and transport patterns. Therefore, computational fluid dynamics (CFD) numerical computation is an important tool for such studies. From the aspect of gas pre-drainage, for layer-through boreholes in the floor roadway of the 8,406 working face in Yangquan Mine 5 in China, reasonable layout parameters were obtained by CFD optimization. For effectively controlling the scope of boreholes along coal seam 9 in the Kaiyuan Mine, CFD computation was performed. The results revealed that the horizontal spacing between boreholes should be ≤2 m when a tri-quincuncial borehole layout is used. Optimization of the surface well position layout for the fault structure zone in the Xinjing Mine of the Yangquan mining area indicated that the horizontal distance between the surface well and the fault plane should be <150 m. From the aspect of gas drainage with mining-induced pressure relief, CFD computation was performed for pressure-relieved gas transport in the K8205 working face of Yangquan Mine 3. The results showed that forced roof caving should be used before the overhang length of hard roof reaches 25 m in the K8205 working face to avoid gas overrun. From the aspect of gas drainage from the abandoned gob, surface well control scopes at different surface well positions were computed, and an O-ring fissure zone is proposed as a reasonable scope for the surface well layout. CFD computation has been widely applied to coal and gas co-extraction in the Yangquan mining area and has played a significant role in guiding related gas drainage engineering practice.
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6

Boncinelli, Paolo, Filippo Rubechini, Andrea Arnone, Massimiliano Cecconi, and Carlo Cortese. "Real Gas Effects in Turbomachinery Flows: A Computational Fluid Dynamics Model for Fast Computations." Journal of Turbomachinery 126, no. 2 (2004): 268–76. http://dx.doi.org/10.1115/1.1738121.

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A numerical model was included in a three-dimensional viscous solver to account for real gas effects in the compressible Reynolds averaged Navier-Stokes (RANS) equations. The behavior of real gases is reproduced by using gas property tables. The method consists of a local fitting of gas data to provide the thermodynamic property required by the solver in each solution step. This approach presents several characteristics which make it attractive as a design tool for industrial applications. First of all, the implementation of the method in the solver is simple and straightforward, since it does not require relevant changes in the solver structure. Moreover, it is based on a low-computational-cost algorithm, which prevents a considerable increase in the overall computational time. Finally, the approach is completely general, since it allows one to handle any type of gas, gas mixture or steam over a wide operative range. In this work a detailed description of the model is provided. In addition, some examples are presented in which the model is applied to the thermo-fluid-dynamic analysis of industrial turbomachines.
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7

Popov, Igor Viktorovich, and Pavel Evgenyevich Bulatov. "Definition of discontinuity types in computational gas dynamics." Keldysh Institute Preprints, no. 89 (2022): 1–12. http://dx.doi.org/10.20948/prepr-2022-89.

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The paper proposes a technique for determining the types of discontinuities in gas dynamics problems in Euler variables. This technique makes it possible to determine the discontinuities of the solution without involving the Riemann problem, which makes it possible to solve gas dynamics problems with an arbitrary equation of state. This approach works efficiently for multidimensional problems and can be effectively used on parallel computing machines, since the type of the discontinuity is determined locally in each computational cell. This method allows to adapt the computational algorithm to regions occupied by different types of discontinuities, which provides an optimal artificial viscosity for obtaining monotonic solutions and ensuring the condition of non-diminishing entropy. This paper gives an example of a gas dynamics problem, in which different types of discontinuities are present.
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8

Jia, Chenhui, Zhiwu Cui, Shijun Guo, and Wensuo Ma. "Research on dynamic characteristics of gas film of spherical hybrid gas bearings based on computational fluid dynamics." Transactions of the Canadian Society for Mechanical Engineering 44, no. 1 (2020): 23–37. http://dx.doi.org/10.1139/tcsme-2018-0134.

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A realizable k–ε turbulence model for spherical spiral groove hybrid gas bearing films was established based on computational fluid dynamics (CFD). A six degrees of freedom passive grid was used to calculate the gas film pressure distribution, bearing capacity, and dynamic characteristic coefficients numerically. The gas flow field dynamic and static pressure coupling mechanism was studied. The effects of the rotation speed, gas film thickness eccentricity ratio, and gas supply pressure on the dynamic and static pressure bearing capacity, and dynamic characteristic coefficients during operation were analyzed as a method of research into the mechanical mechanisms of gas bearing stability. The CFD calculation analysis can simulate the complex gas flow in the transient flow field of the gas film and determine reasonable operation parameters to optimize the dynamic and static pressure coupling effects, which can improve the gas film bearing capacity, dynamic characteristics, and operational stability of gas bearings.
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9

Bolton, Kim, and Arne Rosén. "Computational studies of gas–carbon nanotube collision dynamics." Phys. Chem. Chem. Phys. 4, no. 18 (2002): 4481–88. http://dx.doi.org/10.1039/b200581f.

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10

Delnoij, E., J. A. M. Kuipers, and W. P. M. van Swaaij. "Computational fluid dynamics applied to gas-liquid contactors." Chemical Engineering Science 52, no. 21-22 (1997): 3623–38. http://dx.doi.org/10.1016/s0009-2509(97)00268-6.

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11

Sazhin, S., P. Wild, E. Sazhina, M. Makhlouf, C. Leys, and D. Toebaert. "A new approach to computational gas laser dynamics." Optics & Laser Technology 26, no. 3 (1994): 191–94. http://dx.doi.org/10.1016/0030-3992(94)90042-6.

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12

Li, Y., A. Kirkpatrick, C. Mitchell, and B. Willson. "Characteristic and Computational Fluid Dynamics Modeling of High-Pressure Gas Jet Injection." Journal of Engineering for Gas Turbines and Power 126, no. 1 (2004): 192–97. http://dx.doi.org/10.1115/1.1635398.

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The topic of this paper is the computational modeling of the gas injection process in a large-bore natural gas fueled engine. At high injection pressures, the overall gas injection and mixing process includes compressible flow features such as rarefaction waves and shock formation. The injection geometries examined in the paper include both a two-dimensional slot and an axisymmetric nozzle. The computations examine the effect of the supply pressure/cylinder stagnation pressure ratio, with ratios ranging from 3 to 80, on the velocity and pressure profiles in the near field region. Computational fluid dynamics modeling was compared with results obtained from a two-dimensional analytical method of characteristics solution and experimental results. The comparison process evaluated factors such as pressure and Mach number profiles, jet boundary shape, and shock location.
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13

Kang, Xue, Chang Hua Chen, Ren Chong Teng, and Jian Ye Su. "Computational Fluid Dynamics and its Application in Gas Control of Goaf." Applied Mechanics and Materials 52-54 (March 2011): 1274–78. http://dx.doi.org/10.4028/www.scientific.net/amm.52-54.1274.

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In recent years, study on the regularity of gas moving has been emphasized due to the more seriously problem of mine gas which caused by the ever increasing of mining depth and rate in the coal. As the important source for the workplace gas, the goaf gas always causes a exceeding of the safety limit at the upper corner, it not only influences the sustainability, stability and security of the mines, but also serves as the primary cause of the accidents. In order to discuss the migration and distributed rule of the goaf gas, this article based on computational fluid dynamics, in accordance with the seepage theory and on the premise of analysised the fluid state of goaf gas, the distribution rule of goaf gas moving has been studied by establishing a mathematical model of gas seepage and distribution in the goaf area with a given boundary condition. The research has provided theoretical basis for the analysis of gas density at the upper corner of the mines, demonstrating its theoretical and practical significance in preventing gas overrun and safeguarding safety in coal mining.
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14

Agudelo, John, Andrés Agudelo, and Pedro Benjumea. "Study of diesel sprays using computational fluid dynamics." Revista Facultad de Ingeniería Universidad de Antioquia, no. 49 (July 16, 2013): 61–69. http://dx.doi.org/10.17533/udea.redin.15924.

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En este trabajo se desarrolló un modelo numérico para simular los principales subprocesos que ocurren en un chorro diesel usando un código CDF de libre acceso. El modelo se validó comparando valores predichos de la penetración de la punta del chorro para el dimetil éter (DME) con datos experimentales reportados en la literatura y resultados obtenidos a partir de correlaciones empíricas. Una vez validado, el modelo se usó para evaluar el efecto del tipo de combustible, la presión de inyección y la presión del gas ambiente en la penetración de la punta del chorro, el diámetro medio de Sauter (SMD) y la masa de combustible evaporada. Las propiedades del fluido afectaron significativamente los procesos de atomización y vaporización y en menor medida la penetración del chorro. Independientemente de las presiones de inyección y del gas ambiente, el SMD incrementó con la viscosidad y la tensión superficial mientras la tasa de evaporación incrementó con la volatilidad del combustible. A bajas presiones del gas ambiente el proceso de vaporización fue altamente favorecido así como la penetración del chorro. Para ambos combustibles, a medida que la presión de inyección se incrementó el SMD disminuyó y la tasa de evaporación aumentó.
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15

Chen, Timothy Bo Yuan, Ivan Miguel De Cachinho Cordeiro, Anthony Chun Yin Yuen, et al. "An Investigation towards Coupling Molecular Dynamics with Computational Fluid Dynamics for Modelling Polymer Pyrolysis." Molecules 27, no. 1 (2022): 292. http://dx.doi.org/10.3390/molecules27010292.

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Building polymers implemented into building panels and exterior façades have been determined as the major contributor to severe fire incidents, including the 2017 Grenfell Tower fire incident. To gain a deeper understanding of the pyrolysis process of these polymer composites, this work proposes a multi-scale modelling framework comprising of applying the kinetics parameters and detailed pyrolysis gas volatiles (parent combustion fuel and key precursor species) extracted from Molecular Dynamics models to a macro-scale Computational Fluid Dynamics fire model. The modelling framework was tested for pure and flame-retardant polyethylene systems. Based on the modelling results, the chemical distribution of the fully decomposed chemical compounds was realised for the selected polymers. Subsequently, the identified gas volatiles from solid to gas phases were applied as the parent fuel in the detailed chemical kinetics combustion model for enhanced predictions of toxic gas, charring, and smoke particulate predictions. The results demonstrate the potential application of the developed model in the simulation of different polymer materials without substantial prior knowledge of the thermal degradation properties from costly experiments.
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16

Ryazanov, M. A., O. S. Sorokovikova, V. I. Cherezov, and S. Yu Chernov. "Balanced difference schemes in gas dynamics." Computational Mathematics and Modeling 1, no. 3 (1990): 262–71. http://dx.doi.org/10.1007/bf01126577.

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17

Wu, K., S. Cunningham, S. Sivandran, and J. Green. "Modelling subsea gas releases and resulting gas plumes using Computational Fluid Dynamics." Journal of Loss Prevention in the Process Industries 49 (September 2017): 411–17. http://dx.doi.org/10.1016/j.jlp.2017.08.008.

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18

Seleznev, Vadim, Vladimir Kiselev, and Sergey Pryalov. "Computational Analysis of Natural Gas Delivery Discrepancy." Applied Mechanics and Materials 88-89 (August 2011): 524–30. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.524.

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The article describes algorithm for optimization of discrepancies in natural gas supply to consumers. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Mathematical analysis of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.
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19

Zhu, Likuan, Boyan Song, and Zhen Long Wang. "Computational Fluid Dynamics Analysis on Rupture of Gas Bubble." Applied Mechanics and Materials 339 (July 2013): 468–73. http://dx.doi.org/10.4028/www.scientific.net/amm.339.468.

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Hydrodynamic information of the flow occurring as a bubble ruptures at a gas liquid interface has being obtained from computer simulations. The simulation result is verified by conducting high-speed photography experiment. Process of bubble rupture is clearly captured with simulation and experiment. Shear force generated by bubble rupture increases along with decrease of bursting bubble diameter or increase of coefficient of surface tension. The maximum average shear force ranges from 0.97Pa to 1.91Pa, when bursting bubble diameter changes from 2mm to 10mm.
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20

Boldarev, Aleksey Sergeevich, Olga Gourgenovna Olkhovskaya, Viktor Vasilievich Val'ko, and Valentina Sergeevna Solovyova. "Thermodynamic models of gas mixtures for computational fluid dynamics." Keldysh Institute Preprints, no. 54 (2021): 1–18. http://dx.doi.org/10.20948/prepr-2021-54.

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An approach is considered that allows to obtain a thermodynamic model of a gas mixture when the thermodynamic properties of its components are given. Models of interpenetrating and mutually displacing components are considered. The model of interpenetrating components was tested on the basis of comparing the properties of air and a mixture of gases corresponding to air by its composition. As an example of hydrodynamic modelling using a model of interpenetrating components, the electromagnetic compression of an array of mixed composition (metal and polymer) was computed. The modelling results are in slightly better agreement with the experimental data than previous computations using the dominant component model.
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21

Zhang, Kai, Stefano Brandani, and Jicheng Bi. "Computational fluid dynamics for dense gas-solid fluidized beds." Progress in Natural Science 15, no. 1 (2005): 42–51. http://dx.doi.org/10.1080/10020070512330006.

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22

Zeidan, D., and H. D. Ng. "Computational methods for gas dynamics and compressible multiphase flows." Shock Waves 29, no. 1 (2018): 1–2. http://dx.doi.org/10.1007/s00193-018-0870-9.

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23

Patwardhan, A. W., J. B. Joshi, S. Fotedar, and T. Mathew. "Optimization of gas–liquid reactor using computational fluid dynamics." Chemical Engineering Science 60, no. 11 (2005): 3081–89. http://dx.doi.org/10.1016/j.ces.2004.12.034.

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24

Novotný, Pavel, Peter Raffai, Jozef Dlugoš, Ondřej Maršálek, and Jiří Knotek. "Role Of Computational Simulations In The Design Of Piston Rings." Journal of Middle European Construction and Design of Cars 13, no. 1 (2015): 1–6. http://dx.doi.org/10.1515/mecdc-2015-0001.

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Abstract The paper presents computational approaches using modern strategies for a dynamic piston ring solution as a fluid structural problem. Computational model outputs can be used to understand design parameter influences on defined results of a primarily integral character. Piston ring dynamics incorporates mixed lubrication conditions, the influence of surface roughness on oil film lubrication, the influence of ring movement on gas dynamics, oil film formulation on a cylinder liner and other significant influences. The solution results are presented for several parameters of SI engine piston rings.
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25

Булат, П. В., К. Н. Волков, and М. С. Яковчук. "Flow visualization with strong and weak gas dynamic discontinuities in computational fluid dynamics." Numerical Methods and Programming (Vychislitel'nye Metody i Programmirovanie), no. 3 (September 20, 2016): 245–57. http://dx.doi.org/10.26089/nummet.v17r323.

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Рассматриваются методы визуализации течений с газодинамическими разрывами, позволяющие проводить сравнение результатов численного моделирования с данными физического эксперимента. Дается обзор методов оптической визуализации течений сжимаемого газа (теневые картины, шлирен-изображения, интерферограммы). Приводятся примеры визуального представления решений ряда задач газовой динамики, связанных с расчетами течений, содержащих слабые и сильные газодинамические разрывы. Для повышения наглядности результирующего образа применяются топологические методы визуализации, позволяющие определить положение критических точек, линий отрыва и присоединения потока. A number of methods for the visualization of flows with gas dynamic discontinuities are considered. These methods allow one to perform the direct comparison of numerical results with experimental data. Methods for the optical visualization of compressible gas flows (shadowgraphs, schlieren images, and interferograms) are discussed. Some examples illustrating the visual representation of numerical solutions of gas dynamics problems related to flows containing weak and strong gas dynamic discontinuities are given. Topological methods of visualization are applied to increase the visual representation of resulting images and to define the locations of critical points as well as the separation and attachment lines.
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26

Northall, John D. "The Influence of Variable Gas Properties on Turbomachinery Computational Fluid Dynamics." Journal of Turbomachinery 128, no. 4 (2005): 632–38. http://dx.doi.org/10.1115/1.2221324.

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This paper describes the inclusion of variable gas properties within a Reynolds average Navier-Stokes solver for turbomachinery and its application to multistage turbines. Most current turbomachinery computational fluid dynamics (CFD) models the gas as perfect with constant specific heats. However, the specific heat at constant pressure CP can vary significantly. This is most marked in the turbine where large variations of temperature are combined with variations in the fuel air ratio. In the current model CP is computed as a function of the local temperature and fuel air ratio using polynomial curve fits to represent the real gas behavior. The importance of variable gas properties is assessed by analyzing a multistage turbine typical of the core stages of a modern aeroengine. This calculation includes large temperature variations due to radial profiles at inlet, the addition of cooling air, and work extraction through the machine. The calculation also includes local variations in fuel air ratio resulting from the inlet profile and the dilution of the mixture by the addition of coolant air. A range of gas models is evaluated. The addition of variable gas properties is shown to have no significant effect on the convergence of the algorithm, and the extra computational costs are modest. The models are compared with emphasis on the parameters of importance in turbine design, such as capacity, work, and efficiency. Overall the effect on turbine performance prediction of including variable gas properties in three-dimensional CFD is found to be small.
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27

Kim, Chongam, Kun Xu, Luigi Martinelli, and Antony Jameson. "ANALYSIS AND IMPLEMENTATION OF THE GAS-KINETIC BGK SCHEME FOR COMPUTATIONAL GAS DYNAMICS." International Journal for Numerical Methods in Fluids 25, no. 1 (1997): 21–49. http://dx.doi.org/10.1002/(sici)1097-0363(19970715)25:1<21::aid-fld515>3.0.co;2-y.

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28

Bogomolov, S. V. "Equations of quasi-gas dynamics." Mathematical Models and Computer Simulations 2, no. 4 (2010): 423–28. http://dx.doi.org/10.1134/s2070048210040022.

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29

Rossano, Viola, Amedeo Cittadini, and Giuliano De Stefano. "Computational Evaluation of Shock Wave Interaction with a Liquid Droplet." Applied Sciences 12, no. 3 (2022): 1349. http://dx.doi.org/10.3390/app12031349.

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This article represents the natural continuation of the work by Rossano and De Stefano (2021), dealing with the computational fluid dynamics analysis of a shock wave interaction with a liquid droplet. Differently from our previous work, where a two-dimensional approach was followed, fully three-dimensional computations are performed to predict the aerodynamic breakup of a spherical water body due to the impact of a traveling shock wave. The present engineering analysis focuses on capturing the early stages of the breakup process under the shear-induced entrainment regime. The unsteady Reynolds-averaged Navier–Stokes approach is used to simulate the mean turbulent flow field in a virtual shock tube device with circular cross section. The compressible-flow-governing equations are numerically solved by means of a finite volume method, where the volume of fluid technique is employed to track the air–water interface. The proposed computational modeling approach for industrial gas dynamics applications is verified by making a comparison with reference numerical data and experimental findings, achieving acceptably accurate predictions of deformation and drift of the water body without being computationally cumbersome.
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Hubbard, Joshua A., Meng-Dawn Cheng, Lawrence Cheung, Jared R. Kirsch, Jason M. Richards, and Glenn A. Fugate. "UO2F2 particulate formation in an impinging jet gas reactor." Reaction Chemistry & Engineering 6, no. 8 (2021): 1428–47. http://dx.doi.org/10.1039/d1re00105a.

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31

Cha, Younghwan, Myoungsoo Kim, Dahyeouk Lee, Kibo Kim, Seungkook Yang, and Segeun Park. "Optimization of 450mm Wafer Ashing Chamber by Computational Fluid Dynamics Simulation." Advanced Materials Research 834-836 (October 2013): 1544–47. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1544.

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Ashing is a photoresist-stripping process using oxygen or hydrogen radicals and is one of key process step in the semiconductor manufacturing processes. Uniform and fast stripping is the key factor in ashing. In this study, a computational fluid dynamics simulation was applied to find conditions for uniform molecular flux over the wafer surface and to optimize the ashing chamber geometry. In particular, the distance between the gas inlet baffle and wafer stage in the 450 mm wafer chamber was determined through inductive inference statistics. To improve the reliability of this simulation, the correlations between the calculated molecular flux distribution and the measured ashing rate distribution over 300 mm wafers were sought first. Effects of the distance between the baffle and wafer stage, wafer stage temperature, and gas flow rate on distributions of molecule flux and velocity, temperature and gas molecule density were calculated. The simulation showed that the density distribution over 450 mm wafer surface was more uniform when the distance between gas inlet baffle and wafer stage was between 35 mm and 60 mm, and that the reactant flux distribution was more uniform when the distance was between 60 mm and 80 mm. Therefore, the distance between the gas inlet baffle and wafer stage was chosen to be 60 mm.
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32

Surzhikov, S. T. "NON-EQUILIBRIUM SUPERSONIC FLOW AROUND A BLUNT." Известия Российской академии наук. Механика жидкости и газа, no. 2 (March 1, 2023): 123–37. http://dx.doi.org/10.31857/s0568528122600722.

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The computational model designed for studying the processes of non-equilibrium physicochemical gas dynamics in supersonic rarefied-air flow past a blunt plate of finite dimensions under the laboratory experiment conditions is formulated. The computational model is based on the two-dimensional Navier–Stokes equations, the energy conservation laws for the translational degrees of freedom of atoms and molecules and the vibrational degrees of freedom of diatomic molecules, and the chemical kinetics and diffusion equations for individual components of partially ionized gas flow. The basic gas dynamic and kinetic processes in flow past a blunt plate are analyzed at the Mach numbers M = 10 and 20. It is shown that regions of thermal nonequilibrium are formed.
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33

Surzhikov, S. T. "Non-Equilibrium Supersonic Flow Past a Blunt Plate at High Angle of Attack." Fluid Dynamics 58, no. 1 (2023): 113–27. http://dx.doi.org/10.1134/s0015462822700033.

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Abstract The computational model designed for studying the processes of non-equilibrium physicochemical gas dynamics in supersonic rarefied-air flow past a blunt plate of finite dimensions under the laboratory experiment conditions is formulated. The computational model is based on the two-dimensional Navier–Stokes equations, the energy conservation laws for the translational degrees of freedom of atoms and molecules and the vibrational degrees of freedom of diatomic molecules, and the chemical kinetics and diffusion equations for individual components of partially ionized gas flow. The basic gas dynamic and kinetic processes in flow past a blunt plate are analyzed at the Mach numbers M = 10 and 20. It is shown that regions of thermal nonequilibrium are formed.
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34

Silva, Renato Cesar da, Luben Cabezas Gomez, and Helio Aparecido Navarro. "Numerical Simulation of Gas-Solid Flow in CFB Riser Using Different Approaches of Kinetic Theory of Granular Flows." INTERNATIONAL JOURNAL OF MATHEMATICS, STATISTICS AND OPERATIONS RESEARCH 2, no. 2 (2022): 163–86. http://dx.doi.org/10.47509/ijmsor.2022.v02i02.05.

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In this paper is applied the two-fluid model to simulate the gas-solid flow in a riser of a circulating fluidized bed (CFB). The phases are modeled as a continuum medium computing the solid’s pressure and dynamic viscosity by the kinetic theory of granular flows (KTGF). The numerical simulations are performed with the MFIX (Multiphase Flow with Interface eXchanges) computational fluid dynamics (CFD) code developed in the National Energy Technology Laboratory (NETL). The main aim of this work is to perform a comparative analysis of the simulation results obtained from three different versions of the KTGF. In the work are presented time-averaged results comprehending the radial profiles of the axial velocities of gas and solid phases, the solid volumetric fraction and the solid mass flow. These results are compared with the available experimental data showing a different behavior for each version of the KTGF. For a more complete comparative analysis also are presented time-averaged and transient snapshots of the gas volumetric fraction in two risers sections disposed at two different heights of the column. In all the simulations is used a uniform two-dimensional computational mesh and the Superbee second order scheme for the discretization of the advective terms. The numerical results show that the procedure for the computation of the solid phase pressure and viscosity influences in a significant way the behavior of the gas-solid flow in a riser. These differences are obtained even when it is considered only the KTGF with slightly variations for the constitutive equations computations.
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35

Werneck, Yan Barbosa, Luciana Paixão Motta, Flavia de Bastos, and Rodrigo Weber dos Santos. "Analyzing Foam Injection Dynamics in Porous Media: A Combined Computational and Experimental Approach." Defect and Diffusion Forum 435 (September 19, 2024): 47–57. http://dx.doi.org/10.4028/p-69cwsx.

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The study of foam injection dynamics into porous media holds numerous applications, with its primary use being the optimization of the oil extraction process. Additionally, it finds utility in various other domains, including soil decontamination techniques. This study focuses on evaluating foam injection through low-cost experiments and computational models. The model integrates a classic two-phase immiscible fluid flow in a porous media framework, augmented by a mobility reduction factor to simulate foam’s impact on gas phase mobility. Simple experiments were conducted to assess water displacement using both gas and gas-foam injection methods. Results revealed that while gas injection tends to form preferential paths rapidly, leading to gas disruption, foam injection generates a more compact front, enhancing sweep efficiency by mitigating preferential path formation. The computational model successfully reproduced the experimental findings qualitatively. This research introduces a cost-effective experiment suitable for didactic purposes, illustrating complex concepts and underscoring the complementary nature of experimental and computational methodologies in advancing engineering techniques.
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36

Mukundakrishnan, Karthik, Portonovo S. Ayyaswamy, and David M. Eckmann. "Computational Simulation of Hematocrit Effects on Arterial Gas Embolism Dynamics." Aviation, Space, and Environmental Medicine 83, no. 2 (2012): 92–101. http://dx.doi.org/10.3357/asem.3085.2012.

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37

Matheis, Jan, Hagen Müller, Cornelia Lenz, Michael Pfitzner, and Stefan Hickel. "Volume translation methods for real-gas computational fluid dynamics simulations." Journal of Supercritical Fluids 107 (January 2016): 422–32. http://dx.doi.org/10.1016/j.supflu.2015.10.004.

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38

Hubert, Antoine, Siaka Dembele, Petr Denissenko, and Jennifer Wen. "Predicting Liquefied Natural Gas (LNG) rollovers using Computational Fluid Dynamics." Journal of Loss Prevention in the Process Industries 62 (November 2019): 103922. http://dx.doi.org/10.1016/j.jlp.2019.103922.

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39

Sokolov, I. V., H. M. Zhang, and J. I. Sakai. "Simple and Efficient Godunov Scheme for Computational Relativistic Gas Dynamics." Journal of Computational Physics 172, no. 1 (2001): 209–34. http://dx.doi.org/10.1006/jcph.2001.6821.

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40

Mashayekh, Alireza, Timothy Jacobs, Mark Patterson, and John Etcheverry. "Prediction of air–fuel ratio control of a large-bore natural gas engine using computational fluid dynamic modeling of reed valve dynamics." International Journal of Engine Research 18, no. 9 (2017): 900–908. http://dx.doi.org/10.1177/1468087416686224.

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Air–fuel ratio control of large-bore, two-stroke, natural gas engines, typically used in the oil and gas field, is critically important to maintain stable operation and emission compliance. Many two-stroke applications rely on reed valves to control air and gas induction, which can involve complicated gas flow behavior; standard gas dynamic relationships are typically insufficient to characterize such behavior. Computational fluid dynamic simulations offer the needed complexity, but even so the computational fluid dynamic models, as shown in this work, must also capture the dynamic behavior of the valves themselves. The current work reports on a computational fluid dynamics–based model representing this type of large-bore, two-stroke, natural gas engine using commercially available computational fluid dynamic software. The engine under study is an AJAX E-565 with rated power of 30 kW (40 HP), a bore of 216 mm (8½″), and a stroke of 254 mm (10″). The large engine geometry makes a relatively large solution domain, hence requiring an intense, time-consuming numerical investigation. This large-bore engine works at a rated speed of 525 RPM with a compression ratio of 6 to 1. Two approaches to modeling the reed valve are investigated: (1) a pressure difference–based user-defined function and (2) a fluid–structure interaction user-defined function. The pressure difference–based user-defined function captures reed valve behavior in a simple, binary fashion (i.e. valves are either open or closed based on the pressure difference between the intake pipe and the engine’s stuffing box). The fluid–structure interaction user-defined function, however, predicts the motion of the reed valve strips based on fluid and body motions; although a more complex solution, the fluid–structure interaction user-defined function accurately predicts the engine’s gas exchange process. In this article, the results of each method are presented and validated to show that the added complexity is necessary to properly predict (and thus eventually improve) the engine’s air–fuel ratio control.
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41

Irish, Angelin S., S. Raja, N. Rajesh, and S. Arunvinthan. "Applicability of Canister For Barraging Missiles." International Journal of Aeronautical Science & Aerospace Research 2, no. 6 (2015): 86–90. https://doi.org/10.19070/2470-4415-1500010.

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Computational Fluid Dynamics analysis has been carried out for the canister with a gas generator in it. The objective of this&nbsp;project is to estimate the total energy loss inside a canister, which includes the heat and gas dynamics losses. The output flow&nbsp;properties like total pressure and static pressure variations, maximum velocity and mass flow rate through the gas generator&nbsp;nozzle are analysed. Finite volume method technique is used for solving the solution. CATIA model has been imported to&nbsp;the computational software ANSYS CFX where non-conformal meshing is been created and results have been analysed.
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42

Seleznev, Vadim E. "Numerical Monitoring of Natural Gas Distribution Discrepancy Using CFD Simulator." Journal of Applied Mathematics 2010 (2010): 1–23. http://dx.doi.org/10.1155/2010/407648.

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The paper describes a new method for numerical monitoring of discrepancies in natural gas supply to consumers, who receive gas from gas distribution loops. This method serves to resolve the vital problem of commercial natural gas accounting under the conditions of deficient field measurements of gas supply volumes. Numerical monitoring makes it possible to obtain computational estimates of actual gas deliveries over given time spans and to estimate their difference from corresponding values reported by gas consumers. Such estimation is performed using a computational fluid dynamics simulator of gas flows in the gas distribution system of interest. Numerical monitoring of the discrepancy is based on a statement and numerical solution of identification problem of a physically proved gas dynamics mode of natural gas transmission through specified gas distribution networks. The identified mode parameters should have a minimum discrepancy with field measurements of gas transport at specified reference points of the simulated pipeline network.
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43

Mykhailiuk, Vasyl, Michał Zasadzień, Mikhailo Liakh, Ruslan Deineha, Yurii Mosora, and Oleh Faflei. "Analysis of the Possibility of Modeling Gas Separators using Computational Fluid Dynamics." Management Systems in Production Engineering 32, no. 1 (2024): 80–86. http://dx.doi.org/10.2478/mspe-2024-0009.

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Abstract Today, gas-liquid separators are usually used for the purification of gas mixtures from droplet liquid, and there are many designs of which. However, in order to improve the efficiency of their work, increase throughput, reduce mass and dimensions, they are constantly being improved. Usually, developing a new or improving an existing separator design is a long-term and relatively expensive process. Today, computer programs that implement the finite element method make it possible to speed up and reduce the cost of designing both a gas separator and other equipment. FloEFD program is one of these programs. However, it is more convenient during design to use one computer program that allows you to build 3D models (CAD) and in the same program to use a module for simulating the movement of gas and liquid flows (CFD). Such a program is SolidWorks with the FlowSimulation application module. As for the physical processes that occur during the operation of gas separators, they are quite complex, since a multiphase gas flow with an existing liquid phase is simulated. In the article, simulation modeling of the C-2-1 separator was carried out and the values and distributions of velocities and pressures in its various cross-sections were determined. Special attention was paid to the following cross-sections of the separator: along the axis of its inlet pipe; in the middle is the spigot of the blade screw; on a block of blinds. The difference in pressure at the outlet and inlet of the separator was determined, which is 20267 Pa. Based on the simulation results obtained, recommendations are given for further research and optimization of the separator design. The main parameter that characterizes the degree of separation of liquid from gas in the separator is the efficiency factor, which depends on the design of the separator, thermobaric conditions, parameters of the technological scheme, composition and physical and chemical properties of the gas-liquid flow. As a result of simulated modeling of the separator, its efficiency coefficient was determined when it extracted droplet liquid from the gas-liquid mixture in its various fractions (from 0.01 to 0.1 mm). The efficiency factor is about 100%.
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44

Mas-Peiró, Cristina, Fèlix Llovell Ferret, and Oriol Pou Ibar. "Computational Fluid Dynamic study of gas mixtures in a Non-Thermal Plasma reactor for CO2 conversion with Argon as diluent gas." Afinidad. Journal of Chemical Engineering Theoretical and Applied Chemistry 81, no. 601 (2024): 58–68. http://dx.doi.org/10.55815/424061.

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CO2 utilization has been an emerging technology of increasing global interest due to its direct impact in limiting greenhouse gas emissions. In this contribution, the fluid dynamic behavior of a CO2 conversion non-thermal plasma (NTP) in a dielectric barrier discharge (DBD) reactor is studied through computational fluid dynamics (CFD) simulations.&#x0D; Calculations are provided in conjunction with experimental results and the thermodynamic characterization of the compounds and mixtures involved. This CFD study utilizes a well-established methodology that allows the optimization of fluid flow with limited computational burden.&#x0D; Firstly, results are presented for an Example Case, in which several variables are studied both at the final iteration as well as across iterations. Secondly, a range of Study Cases, changing the inlet composition and volume rate, are presented. Average velocity is one of the most significant variables to predict the reactor’s yield, while the temperature, density and pressure in the reactor remain, in most cases, almost constant.&#x0D; The resulting CFD computations describe the behavior of the fluids in the reactor in a predictive manner for future experimental results. Limitations in the fluid’s characterization occur due to not explicitly including the plasma reaction, which will be aimed at in future contributions.
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45

Camila, Ariana Becker Pereira, Dennise Medeiros Macêdo Maria, Rodrigues Menezes Romualdo, and Rodrigues de Farias Neto Severino. "Computational Modeling and Simulation of Gas Turbulence Phenomena in Solution Blow Spinning Process for Ceramic Nanofibers." International Journal of Advances in Engineering & Technology (IJAET) 16, no. 4 (2023): 129–43. https://doi.org/10.5281/zenodo.8330138.

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<em>The high-speed air profile expelled from a solution blow spinning nozzle was investigated using computational fluid dynamics and a k-&epsilon; turbulence model. A convergent nozzle comprised of a polymer solution channel, an air inlet and an air chamber were computationally generated to better understand the behavior of the fluids inside the matrix. Three meshes were proposed to study the influence of air velocity, pressure, and turbulent kinetic energy. The variation in gas outlet velocity reveals a lack of uniformity in the profile, indicating that the tube length is insufficient to achieve uniformity, which may significantly impact fiber morphology. Under different pressures (40 and 30 psi), there was a reduction in the average gas velocity inside and at the tube outlet. However, uniformity has not yet been achieved, potentially affecting fiber continuity. </em>
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46

Sánchez, Alejandro Gómez, Lada Domratcheva Lvova, Víctor López Garza, Ramón Román Doval, and María de Lourdes Mondragón Sánchez. "Computational Fluid Dynamics in the Carbon Nanotubes Synthesis by Chemical Vapor Deposition." MRS Proceedings 1479 (2012): 111–16. http://dx.doi.org/10.1557/opl.2012.1607.

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ABSTRACTIn this paper, an experimental study aimed at achieving better control of the deposition patterns of carbon nanotubes (CNTs) is presented. CNTs were grown on a long of reactor by the catalytic chemical vapor deposition (CVD) of a benzene/ferrocene solution at 1073 K. The deposition patterns on the substrate were controlled for process times and carrier gas flow rates. In order to investigate the reaction mechanism and production rate for the growth of CNTs in catalyst CVD, computational fluid dynamics (CFD) model was developed in this study. Then the computational model was integrated with the dynamic model to optimize the process parameters formulating a correlation between turbulence, deposition rate for the growth of carbon nanotubes and parameters as process time and carrier gas flow rate. Scanning electron microscopes (SEM) are used to characterize carbon nanotubes products.
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47

Nielson, Samuel, Tyamo Okosun, Bradley Damstedt, Megha Jampani, and Chenn Q. Zhou. "Tuyere-Level Syngas Injection in the Blast Furnace: A Computational Fluid Dynamics Investigation." Processes 9, no. 8 (2021): 1447. http://dx.doi.org/10.3390/pr9081447.

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With the recent push towards high injection rate blast furnace operation for economic and environmental reasons, it has become desirable in North America to better understand the impacts of alternate injected gas fuels in comparison to the well-documented limitations of natural gas. The quenching effects of gas injection on the furnace present a functional limit on the maximum stable injection rate which can be utilized. With this in mind, researchers at Purdue University Northwest’s Center for Innovation through Visualization and Simulation utilized previously developed computational fluid dynamics (CFD) models of the blast furnace to explore the impacts of replacing natural gas with syngas in a blast furnace with a single auxiliary fuel supply. Simulations predicted that the syngas injection can indeed reduce coke consumption in the blast furnace at similar injection rates to natural gas while maintaining stable raceway flame and reducing gas temperatures. The coke rates predicted by modeling using similar injection rates indicated an improvement of 8 to 15 kg/thm compared to baseline conditions when using the syngas of various feedstocks. Additionally, syngas injection scenarios typically produced higher raceway flame temperatures than comparable natural gas injection cases, indicating potential headroom for reducing oxygen enrichment in the hot blast or providing an even higher total injection rate.
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48

Shojaee, Saeed, Seyyed Hossein Hosseini, and Behzad Saeedi Razavi. "Computational Fluid Dynamics Simulation of Multiphase Flow in Structured Packings." Journal of Applied Mathematics 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/917650.

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A volume of fluid multiphase flow model was used to investigate the effective area and the created liquid film in the structured packings. The computational results revealed that the gas and liquid flow rates play significant roles in the effective interfacial area of the packing. In particular, the effective area increases as the flow rates of both phases increase. Numerical results were compared with the Brunazzi and SRP models, and a good agreement between them was found. Attention was given to the process of liquid film formation in both two-dimensional (2D) and three-dimensional (3D) models. The current study revealed that computational fluid dynamics (CFD) can be used as an effective tool to provide information on the details of gas and liquid flows in complex packing geometries.
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Wakid, Muhkamad, Agus Widyianto, and Asri Widowati. "Karakteristik Panas pada Exhaust manifold dengan Variasi Putaran Mesin menggunakan Computational Fluid Dynamics." Jurnal Pendidikan Vokasi Otomotif 6, no. 2 (2024): 51–70. http://dx.doi.org/10.21831/jpvo.v6i2.70755.

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Pemanfaatan teknologi dalam industri otomotif telah memberikan dampak signifikan terhadap efisiensi mesin kendaraan. Salah satu aspek kritis dalam sistem pembakaran adalah manajemen panas pada exhaust manifold. Penelitian ini bertujuan untuk mengkarakteristikkan distribusi panas, tekanan dan kecepatan aliran gas buang pada exhaust manifolddengan variasi putaran mesin menggunakan Computational Fluid Dynamics (CFD). Dalam penelitian ini menggunakan empat variasi putaran mesin yaitu 750 rpm, 1000 rpm, 1500 rpm dan 2000 rpm. Setiap variasi putaran mesin memiliki suhu serta kecepatan aliran gas buang yang berbeda pada setiap saluran masuknya. Putaran mesin 750 rpm menaikkan suhu material manifold buang hingga 235°C. Suhu permukaan material meningkat secara signifikan seiring dengan kecepatan mesin. Perbandingan antara profil suhu gas buang dan suhu permukaan bahan exhaust manifoldmengungkapkan hubungan erat antara aktivitas mesin dan suhu permukaan. Peningkatan suhu seiring dengan kenaikan putaran mesin mencerminkan intensifikasi aktivitas pembakaran, memiliki dampak langsung pada kestabilan suhu manifold. Analisis tekanan gas buang menyoroti peningkatan tekanan seiring dengan peningkatan putaran mesin. Lonjakan tekanan pada putaran mesin tinggi mengindikasikan intensifikasi dalam volume dan kecepatan aliran gas buang selama fase pembakaran. Profil kecepatan aliran gas buang menunjukkan peningkatan sejalan dengan pertambahan putaran mesin.
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SEVERINA, Natalia S. "SOFTWARE COMPLEX FOR SOLVING THE DIFFERENT TASKS OF PHYSICAL GAS DYNAMICS." Periódico Tchê Química 16, no. 32 (2019): 424–36. http://dx.doi.org/10.52571/ptq.v16.n32.2019.442_periodico32_pgs_424_436.pdf.

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This article is relevant due to the fact that The complexity of scientific problems solved by the methods of physical and mathematical modeling, the increasing requirements for the accuracy of their solution leads to an increase in the volume of data processed during the computational experiments. The aim of the work is to reduce the monetary and time costs for the work of scientific personnel which arise when using the weakly structured software that requires a large number of secondary activities not related to the activity on the performance of calculations, as well as providing the means of data exchange between the related research areas. This article discusses a computational algorithm and a set of software tools for modeling the fine structure of non-stationary multicomponent reactive gas flows and provides the structure of the complex, as well as the description of individual elements, and examples. A set of software tools for providing the numerical modeling of problems in the physical gas dynamics, including the graphic and information components supporting the resource-intensive stages of computational experiments is described. The complex of software tools consists of a graphical shell of control elements of the system; database of thermodynamic properties of substances and kinetic mechanisms, and the graphical interface for controlling it; module visualization of the results of solving computational problems; software components of the automated preparation of input data for the problem of modeling unsteady flows of the reacting gas. The developed set of programs can be used to solve the problems of the reacting gas dynamics, which are of practical importance, as well as the illustrator of training courses in the physical gas dynamics.
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