Second order temperature jump boundary condition for nano/microscale and hypersonic rarefied gas flow simulations

2014 ◽  
Author(s):  
Nam T. P. Le ◽  
Ehsan Roohi
Keyword(s):  
Boundary Condition ◽  
Gas Flow ◽  
Temperature Jump ◽  
Rarefied Gas ◽  
Second Order ◽  
Rarefied Gas Flow ◽  
Flow Simulations

scholarly journals New temperature jump boundary condition in high-speed rarefied gas flow simulations

2017 ◽  
Vol 39 (2) ◽  
pp. 165-176
Author(s):  
Nam Tuan Phuong Le ◽  
Ngoc Anh Vu ◽  
Le Tan Loc ◽  
Tran Ngoc Thoai
Keyword(s):  
High Speed ◽  
Gas Flow ◽  
Sliding Friction ◽  
Temperature Jump ◽  
Stokes Equations ◽  
Rarefied Gas ◽  
Jump Condition ◽  
Rarefied Gas Flow ◽  
Flow Simulations ◽  
Knudsen Numbers

The effect of the sliding friction has been important in calculating the heat flux of gas flow from the surface since there is some slip over the surface. There has not been any the temperature jump condition including the sliding friction part so far. In this paper, we will propose a new temperature jump condition that includes the sliding friction. Our new temperature jump condition will be evaluated for NACA0012 micro-airfoil in high-speed rarefied gas flow simulations using the CFD method, which solves the Navier-Stokes equations within the OpenFOAM framework with working gas as air. The airfoil case is simulated with various Knudsen numbers from 0.026 to 0.26, and the angles-of-attack (AOAs) from 0-deg to 20-deg. The surface gas temperatures predicting by our new temperature jump condition give good agreements with the DSMC data, especially the NACA0012 micro-airfoil cases with the high Knudsen numbers, Kn = 0.1, and Kn = 0.26 with AOA = 20-deg. for the lower surface.

Data-based modeling of gas-surface interaction in rarefied gas flow simulations

2019 ◽  
Vol 31 (6) ◽  
pp. 067109 ◽  
Author(s):  
Nemanja Andric ◽  
Daniel W. Meyer ◽  
Patrick Jenny
Keyword(s):  
Gas Flow ◽  
Rarefied Gas ◽  
Surface Interaction ◽  
Rarefied Gas Flow ◽  
Flow Simulations
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