A Hybrid BGK Scheme for Rarefied Gas Flow Computations
Abstract
A hybrid BGK scheme is investigated and developed in this paper. The computational domain is divided into two different types of domains based on the gradient-length based Kn number, and then the direct BGK solver is used to solve the region for the high Kn number region and the BGKX solver is applied to the lower Kn number region. The information between the two flow solver is transferred through ghost cells. The hybrid scheme is applied to the rarefied flow around a cylinder at different Mach numbers. The computational results agrees well with the full direct BGK solver and the computational efficiency has been improved.
- Publication:
-
American Institute of Physics Conference Series
- Pub Date:
- May 2011
- DOI:
- 10.1063/1.3562708
- Bibcode:
- 2011AIPC.1333..569Y
- Keywords:
-
- rarefied gas dynamics;
- integro-differential equations;
- nonequilibrium flow;
- hypersonic flow;
- 47.45.Dt;
- 02.60.Nm;
- 47.70.Nd;
- 47.40.Ki;
- Free molecular flows;
- Integral and integrodifferential equations;
- Nonequilibrium gas dynamics;
- Supersonic and hypersonic flows