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Numerical Modeling of Nonequilibrium Driven Cavity Gas Flow with a High-Order Moment Approach

X.-J. GU, D. R. EMERSON, G.-H. TANG, C. MOULINEC

Abstract


A high-order moment approach is employed to model gas flow in a driven cavity under nonequilibrium conditions. To apply the moment method to low speed flow, the higher moments are decomposed into components representing their gradient (hydrodynamic) and nongradient (non-hydrodynamic) parts. As a result, the moment equations can be expressed in a convection-diffusion form and traditional CFD techniques for low speed flow can be used. The moment equations have been implemented in our in-house parallel CFD code, THOR. The validity of the moment method for nonequilibrium gas flow in the transition regime is assessed and the parallel performance of the code is measured on different computer platforms.

Keywords


nonequilibrium flow, driven cavity, moment method, Knudsen numberText

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