Thermodynamically consistent hydrodynamic computational models for high-Knudsen-number gas flows

1999 ◽  
Vol 11 (9) ◽  
pp. 2788-2802 ◽  
Author(s):  
R. S. Myong
Keyword(s):  
Knudsen Number ◽  
Computational Models ◽  
Gas Flows

Simulation of High Knudsen Number Gas Flows in Nanochannels via the Lattice Boltzmann Method

2011 ◽  
Vol 403-408 ◽  
pp. 5318-5323
Author(s):  
A.H. Meghdadi Isfahani ◽  
A. Soleimani ◽  
A. Homayoon
Keyword(s):  
Lattice Boltzmann Method ◽  
Knudsen Number ◽  
Lattice Boltzmann ◽  
Numerical Data ◽  
Gas Flows ◽  
Wide Range ◽  
Flow Through ◽  
Boltzmann Method ◽  
Slip Transition ◽  
Pressure Driven Flow

Using a modified Lattice Boltzmann Method (LBM), pressure driven flow through micro and nano channels has been modeled. Based on the improving of the dynamic viscosity, an effective relaxation time formulation is proposed which is able to simulate wide range of Knudsen number, Kn, covering the slip, transition and to some extend the free molecular regimes. The results agree very well with exiting empirical and numerical data.

Numerical Simulation on Computational Model of Hypersonic Slip Flow

2014 ◽  
Vol 563 ◽  
pp. 241-244
Author(s):  
Xue Wei Liu ◽  
Kai Luo ◽  
Lei Ming ◽  
Li Min Song ◽  
Jun Jin
Keyword(s):  
Numerical Simulation ◽  
Mach Number ◽  
Computational Model ◽  
Knudsen Number ◽  
Computational Models ◽  
Slip Flow ◽  
Slip Model

Three main computational models in hypersonic slip flow are derived and analyzed in detail and then compared by numerical simulation in which 2D cylinder hypersonic slip flow with Mach number 10 and Knudsen number 0.002, 0.01, 0.05, 0.25 are examined, results come out that the improved Maxwell slip model shows better applicability.

Flow and thermal field investigation of rarefied gas in a trapezoidal micro/nano-cavity using DSMC

2021 ◽  
pp. 2150162
Author(s):  
Mostafa Zakeri ◽  
Ehsan Roohi
Keyword(s):  
Knudsen Number ◽  
Thermal Field ◽  
Rarefied Gas ◽  
Direct Simulation Monte Carlo ◽  
Field Investigation ◽  
Gas Flows ◽  
Fourier Law ◽  
Rarefied Gas Flows ◽  
Knudsen Numbers ◽  
Simulation Monte Carlo

The impetus of the this study is to investigate flow and thermal field in rarefied gas flows inside a trapezoidal micro/nano-cavity using the direct simulation Monte Carlo (DSMC) technique. The investigation covers the hydrodynamic properties and thermal behavior of the flow. The selected Knudsen numbers for this study are arranged in the slip and transition regimes. The results show the center of the vortex location moves by variation in the Knudsen numbers. Also, as the Knudsen number increases, the non-dimensional shear stress increases, but the distribution deviates from a symmetrical profile. The cold to hot transfer, which is in contrast with the conventional Fourier law, is observed. We show that the heat transfer is affected by the second derivative of the velocity. By increasing the Knudsen number, the transferred heat through the walls decreases, but the contraction/expansion effects on the temperature in the corner of the cavity become higher.

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