A Computationally Efficient Framework for Modeling Microscale and Rarefied Gas Flows Based on New Constitutive Relations

2010 ◽  
Author(s):  
Rho Shin Myong
Keyword(s):  
Rarefied Gas ◽  
Constitutive Relations ◽  
Gas Flows ◽  
Computationally Efficient ◽  
Rarefied Gas Flows

Multiscale Simulation of Internal Rarefied Gas Flows

2013 ◽  
Author(s):  
Duncan A. Lockerby ◽  
Alexander Patronis ◽  
Matthew K. Borg ◽  
Jason M. Reese
Keyword(s):  
Rarefied Gas ◽  
Direct Simulation Monte Carlo ◽  
Internal Flow ◽  
Multiscale Simulation ◽  
Full Scale ◽  
Test Case ◽  
Gas Flows ◽  
Computationally Efficient ◽  
Rarefied Gas Flows ◽  
Diverging Channel

This paper describes the development and application of a multiscale method for the efficient simulation of a large class of low-speed internal rarefied gas flows. The method is an extension of the hybrid atomistic-continuum approach recently proposed by Borg et al (2013) [J. Comp. Phys., 233, pp 400–413] for the simulation of micro/nano flows of high-aspect ratio. The extension is twofold: 1) a modification to accommodate fluid compressibility; and 2) implementation using a direct simulation Monte Carlo (DSMC) method for the treatment of dilute rarefied gas flows. The method is applied to a pair of internal-flow configurations: flow through a converging-diverging channel and eccentric cylindrical Couette flow. For validation/verification purposes, the multiscale simulation results are compared to those obtained from a full-scale DSMC simulation: very close agreement is obtained in all cases. The multiscale simulation is an order of magnitude more computationally efficient than the full-scale DSMC for the first test case, and two orders of magnitude more efficient for the second case.

Shock polar investigation in supersonic rarefied gas flows over a circular cylinder

2021 ◽  
Vol 33 (5) ◽  
pp. 052006
Author(s):  
Hassan Akhlaghi ◽  
Ehsan Roohi ◽  
Abbas Daliri ◽  
Mohammad-Reza Soltani
Keyword(s):  
Circular Cylinder ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows

scholarly journals Rarefied gas flows through meshes and implications for atmospheric measurements

2001 ◽  
Vol 19 (5) ◽  
pp. 563-569 ◽  
Author(s):  
J. Gumbel
Keyword(s):  
Middle Atmosphere ◽  
Rarefied Gas ◽  
Direct Simulation Monte Carlo ◽  
Atmospheric Composition ◽  
Gas Flows ◽  
Atmospheric Measurements ◽  
Rarefied Gas Flows ◽  
Flow Disturbances ◽  
Composition And Structure ◽  
Compression Effects

Abstract. Meshes are commonly used as part of instruments for in situ atmospheric measurements. This study analyses the aerodynamic effect of meshes by means of wind tunnel experiments and numerical simulations. Based on the Direct Simulation Monte Carlo method, a simple mesh parameterisation is described and applied to a number of representative flow conditions. For open meshes freely exposed to the flow, substantial compression effects are found both upstream and downstream of the mesh. Meshes attached to close instrument structures, on the other hand, cause only minor flow disturbances. In an accompanying paper, the approach developed here is applied to the quantitative analysis of rocket-borne density measurements in the middle atmosphere.Key words. Atmospheric composition and structure (instruments and techniques; middle atmosphere – composition and chemistry)

scholarly journals An open source, parallel DSMC code for rarefied gas flows in arbitrary geometries

2010 ◽  
Vol 39 (10) ◽  
pp. 2078-2089 ◽  
Author(s):  
T.J. Scanlon ◽  
E. Roohi ◽  
C. White ◽  
M. Darbandi ◽  
J.M. Reese
Keyword(s):  
Open Source ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows ◽  
Arbitrary Geometries

Reconsideration of the implicit boundary conditions in pressure driven rarefied gas flows through capillaries

Vacuum ◽  
2019 ◽  
Vol 160 ◽  
pp. 114-122 ◽  
Author(s):  
Giorgos Tatsios ◽  
Dimitris Valougeorgis ◽  
Stefan K. Stefanov
Keyword(s):  
Boundary Conditions ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows ◽  
Pressure Driven
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