Moment equations and gas-kinetic scheme application to numerical simulation of gas flows in micro scale devices

2014 ◽  
Author(s):  
M. Yu. Timokhin ◽  
I. E. Ivanov ◽  
I. A. Kryukov
Keyword(s):  
Numerical Simulation ◽  
Kinetic Scheme ◽  
Gas Flows ◽  
Moment Equations ◽  
Micro Scale

Non-stationary process characteristics of the gas outflow into a liquid

2019 ◽  
Vol 14 (2) ◽  
pp. 82-88
Author(s):  
M.V. Alekseev ◽  
I.S. Vozhakov ◽  
S.I. Lezhnin
Keyword(s):  
Numerical Simulation ◽  
Liquid Column ◽  
Gas Content ◽  
Liquid Lead ◽  
Gas Flows ◽  
Asymptotic Model ◽  
Process Characteristics ◽  
Significant Difference ◽  
Order Of Magnitude ◽  
Volume Method

A numerical simulation of the process of the outflow of gas under pressure into a closed container partially filled with liquid was carried out. For comparative theoretical analysis, an asymptotic model was used with assumptions about the adiabaticity of the gas outflow process and the ideality of the liquid during the oscillatory one-dimensional motion of the liquid column. In this case, the motion of the liquid column and the evolution of pressure in the gas are determined by the equation of dynamics and the balance of enthalpy. Numerical simulation was performed in the OpenFOAM package using the fluid volume method (VOF method) and the standard k-e turbulence model. The evolution of the fields of volumetric gas content, velocity, and pressure during the flow of gas from the high-pressure chamber into a closed channel filled with liquid in the presence of a ”gas blanket“ at the upper end of the channel is obtained. It was shown that the dynamics of pulsations in the gas cavity that occurs when the gas flows into the closed region substantially depends on the physical properties of the liquid in the volume, especially the density. Numerical modeling showed that the injection of gas into water occurs in the form of a jet outflow of gas, and for the outflow into liquid lead, a gas slug is formed at the bottom of the channel. Satisfactory agreement was obtained between the numerical calculation and the calculation according to the asymptotic model for pressure pulsations in a gas projectile in liquid lead. For water, the results of calculations using the asymptotic model give a significant difference from the results of numerical calculations. In all cases, the velocity of the medium obtained by numerical simulation and when using the asymptotic model differ by an order of magnitude or more.

Huff and puff process optimization in micro scale by coupling laboratory experiment and numerical simulation

Fuel ◽  
2018 ◽  
Vol 224 ◽  
pp. 289-301 ◽  
Author(s):  
Damian Janiga ◽  
Robert Czarnota ◽  
Jerzy Stopa ◽  
Paweł Wojnarowski
Keyword(s):  
Numerical Simulation ◽  
Laboratory Experiment ◽  
Process Optimization ◽  
Micro Scale

Reduced order modeling-based discrete unified gas kinetic scheme for rarefied gas flows

2020 ◽  
Vol 32 (6) ◽  
pp. 067108 ◽  
Author(s):  
Xiang Zhao ◽  
Chen Wu ◽  
Zhen Chen ◽  
Liming Yang ◽  
Chang Shu
Keyword(s):  
Rarefied Gas ◽  
Kinetic Scheme ◽  
Reduced Order Modeling ◽  
Gas Flows ◽  
Reduced Order ◽  
Rarefied Gas Flows ◽  
Unified Gas Kinetic Scheme

scholarly journals Modelling of textile composite reinforcements on the micro-scale

2014 ◽  
Vol 14 (1) ◽  
pp. 28-33 ◽  
Author(s):  
Oliver Döbrich ◽  
Thomas Gereke ◽  
Chokri Cherif
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Computational Cost ◽  
Textile Composite ◽  
Element Analysis ◽  
Simulation Tools ◽  
Micro Scale ◽  
Generating Method ◽  
Geometrical Effects ◽  
Composite Reinforcements

Abstract Numerical simulation tools are increasingly used for developing novel composites and composite reinforcements. The aim of this paper is the application of digital elements for the simulation of the mechanical behaviour of textile reinforcement structures by means of a finite element analysis. The beneficial computational cost of these elements makes them applicable for the use in large models with a solution on near micro-scale. The representation of multifilament yarn models by a large number of element-chains is highly suitable for the analysis of structural and geometrical effects. In this paper, a unit cell generating method for technical reinforcement textiles, using digital elements for the discretization, is introduced.

Numerical simulation of gas flows around aircraft with allowance for the flow/exhaust jet interaction

2015 ◽  
Vol 55 (4) ◽  
pp. 677-689
Author(s):  
D. A. Zabarko ◽  
V. I. Zubov ◽  
V. P. Kotenev ◽  
V. M. Krivtsov ◽  
Yu. A. Polezhaev
Keyword(s):  
Numerical Simulation ◽  
Gas Flows ◽  
Jet Interaction ◽  
Exhaust Jet

Aspects of self-similar diffraction gas flows and their numerical simulation

1987 ◽  
Vol 21 (4) ◽  
pp. 632-638
Author(s):  
A. Yu. Dem'yanov ◽  
A. V. Panasenko
Keyword(s):  
Numerical Simulation ◽  
Gas Flows ◽  
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