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NIA Seminar by Taku Ohwada |
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Date: July 27, 2006
Time: 11:00am
Location: NIA, Rm 137
Kinetic CFD Scheme and Its Application to Deterministic
Hybrid Computation of Rarefied Gas Flows
Prof. Taku Ohwada, Kyoto University
Gas-dynamic problems in aerospace engineering are now expanding from
conventional continuum fluid-dynamic problems to those for wide range of
Knudsen numbers. The idea of coupling CFD solutions in near equilibrium
regions to solutions of the Boltzmann equation in non-equilibrium regions
is quite reasonable and a lot of efforts have been made in
particle-continuum hybrid approach using DSMC and CFD. Because of
stochastic nature of the DSMC, however, the reliable results seem to be
limited to steady case, where the influence of stochastic noise of DSMC
can be effectively reduced by time averaging after the establishment of
steady state.
In this talk, we propose a deterministic hybrid approach employing a
kinetic CFD scheme for compressible Navier-Stokes equations and a
finite-difference method for the Boltzmann equation as an alternative to
the particle-continuum hybrid approach. We will demonstrate the validity
and the simplicity of the proposed deterministic hybrid approach in some
1D and 2D time dependent problems.
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