Gas-Kinetic Computational Algorithms for Hypersonic Flows in Continuum and Transitional Regimes

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$99,992.00
Award Year:
2008
Program:
SBIR
Phase:
Phase I
Contract:
NNX08CC63P
Award Id:
88108
Agency Tracking Number:
074789
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
3409 N. 42nd Place, Phoenix, AZ, 85018
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
781820258
Principal Investigator:
Lei Tang
Principal Investigator
(480) 518-0981
tanglei@d-p-llc.com
Business Contact:
Lei Tang
President
(480) 518-0981
tanglei@d-p-llc.com
Research Institution:
n/a
Abstract
This SBIR Phase I project explores two gas-kinetic computational algorithms for simulation of hypersonic flows in both continuum and transitional regimes. One is the gas-kinetic BGK-Burnett solver and the other is the gas-kinetic BGK solver with the regulated particle collision time. Different from the macroscopic Burnett approach, the proposed gas-kinetic BGK-Burnett solver is unconditionally stable for all Knudsen numbers. Whereas it is almost impossible to correctly set up boundary condition for the Burnett equations, this can be easily done in the proposed BGK-Burnett solver with the Maxwell boundary condition, re-emitting the particles from the boundary according to the accommodation coefficient. More importantly, this BGK-Burnett solver not only allows a single algorithm for both continuum and transitional flow regimes but also is more suitable for integration with either DSMC or direct Boltzmann solver in the rarefied flow regime. The gas-kinetic BGK solver with the regulated particle collision time can further reduce the computational costs over the BGK-Burnett solver. The focus of Phase I work is to determine the validity Knudsen number range of these two algorithms.

* information listed above is at the time of submission.

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