General Reynolds analogy on curved surfaces in hypersonic rarefied gas flows with non-equilibrium chemical reactions

2016 ◽  
Author(s):  
Chen Xingxing ◽  
Wang Zhihui ◽  
Yu Yongliang
Keyword(s):  
Chemical Reactions ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Curved Surfaces ◽  
Reynolds Analogy ◽  
Rarefied Gas Flows ◽  
Equilibrium Chemical ◽  
Non Equilibrium

Analysis of Rotational Non-equilibrium in Rarefied Gas Flows by REMPI

2004 ◽  
Vol 2004.7 (0) ◽  
pp. 35-36
Author(s):  
Hideo MORI ◽  
Tomohide NIIMI ◽  
Isao AKIYAMA ◽  
Takumi TSUZUKI
Keyword(s):  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows ◽  
Non Equilibrium

scholarly journals Analysis of the Moment Method and the Discrete Velocity Method in Modeling Non-Equilibrium Rarefied Gas Flows: A Comparative Study

2019 ◽  
Vol 9 (13) ◽  
pp. 2733
Author(s):  
Weiqi Yang ◽  
Shuo Tang ◽  
Hui Yang
Keyword(s):  
Moment Method ◽  
Rarefied Gas ◽  
Hermite Polynomials ◽  
Distribution Functions ◽  
Gas Flows ◽  
Thermally Induced ◽  
Rarefied Gas Flows ◽  
Discrete Velocity Method ◽  
The Moment ◽  
Non Equilibrium

In the present study, the performance of the moment method, in terms of accuracy and computational efficiency, was evaluated at both the macro- and microscopic levels. Three different types of non-equilibrium gas flows, including the force-driven Poiseuille flow, lid-driven and thermally induced cavity flows, were simulated in the slip and transition regimes. Choosing the flow fields obtained from the Boltzmann model equation as the benchmark, the accuracy and validation of Navier–Stokes–Fourier (NSF), regularized 13 (R13) and regularized 26 (R26) equations were explored at the macroscopic level. Meanwhile, we reconstructed the velocity distribution functions (VDFs) using the Hermite polynomials with different-order of molecular velocity moments, and compared them with the Boltzmann solutions at the microscopic level. Moreover, we developed a kinetic criterion to indirectly assess the errors of the reconstructed VDFs. The results have shown that the R13 and R26 moment methods can be faithfully used for non-equilibrium rarefied gas flows in the slip and transition regimes. However, as indicated from the thermally induced case, all of the reconstructed VDFs are still very close to the equilibrium state, and none of them can reproduce the accurate VDF profile when the Knudsen number is above 0.5.

Analysis of non-equilibrium rarefied gas flows induced by evaporation from nanoporous membranes

2021 ◽  
Vol 2021.27 (0) ◽  
pp. 10C03
Author(s):  
Hiroki IMAI ◽  
Yuta SASAKI ◽  
Hiroshi MATSUMOTO ◽  
Yuta YOSHIMOTO ◽  
Shu TAKAGI ◽  
...  
Keyword(s):  
Rarefied Gas ◽  
Gas Flows ◽  
Nanoporous Membranes ◽  
Rarefied Gas Flows ◽  
Non Equilibrium

Parallel Computing of Non-equilibrium Hypersonic Rarefied Gas Flows

2001 ◽  
pp. 53-63
Author(s):  
Yoichiro Matsumoto ◽  
Hiroki Yamaguchi ◽  
Nobuyuki Tsuboi
Keyword(s):  
Parallel Computing ◽  
Rarefied Gas ◽  
Gas Flows ◽  
Rarefied Gas Flows ◽  
Non Equilibrium

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)

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