TY - JOUR
T1 - A methodology for hybrid simulation of rarefield and continuum flow regimes
AU - Ladeinde, Foluso
AU - Cai, Xiaodan
AU - Agarwal, Ramesh
N1 - Funding Information:
The work reported in this paper is supported by the United States Air Force Research Laboratory. We appreciate the support provided by Dr. Peter Gnoffo of NASA Langley Research Center. Peter developed the original LAURA code.
Publisher Copyright:
© 2018 Elsevier Masson SAS
PY - 2018/4
Y1 - 2018/4
N2 - A hybrid procedure consisting of a high order continuum (HOC) model and the direct simulation Monte-Carlo (DSMC) solver is proposed in this paper, as it represents a promising approach for seamless computation of hypersonic flows in all regimes. This approach also allows the effects of thermophysics (thermal and chemical non-equilibrium) and turbulence to be included so that gas interactions can be modeled much more easily than in other approaches. Such hybrid procedures can also be developed into robust and efficient parallel computing tools for practical 3D computations. The main idea behind the proposed HOC/DSMC methodology consists of incorporating the physically realizable and computationally stable version of the Burnett equations into hypersonic codes that have the capability for calculating non-equilibrium chemistry and temperature. We explore the feasibility of simplified, yet accurate and numerically stable, versions of the Burnett equations. We discuss such a model in detail, providing an analysis of its stability and performance for Alsmeyer's shock wave problem and hypersonic flow over a sphere. We also report on the performance of the DSMC component of the proposed hybrid scheme.
AB - A hybrid procedure consisting of a high order continuum (HOC) model and the direct simulation Monte-Carlo (DSMC) solver is proposed in this paper, as it represents a promising approach for seamless computation of hypersonic flows in all regimes. This approach also allows the effects of thermophysics (thermal and chemical non-equilibrium) and turbulence to be included so that gas interactions can be modeled much more easily than in other approaches. Such hybrid procedures can also be developed into robust and efficient parallel computing tools for practical 3D computations. The main idea behind the proposed HOC/DSMC methodology consists of incorporating the physically realizable and computationally stable version of the Burnett equations into hypersonic codes that have the capability for calculating non-equilibrium chemistry and temperature. We explore the feasibility of simplified, yet accurate and numerically stable, versions of the Burnett equations. We discuss such a model in detail, providing an analysis of its stability and performance for Alsmeyer's shock wave problem and hypersonic flow over a sphere. We also report on the performance of the DSMC component of the proposed hybrid scheme.
UR - http://www.scopus.com/inward/record.url?scp=85043517827&partnerID=8YFLogxK
U2 - 10.1016/j.ast.2017.12.036
DO - 10.1016/j.ast.2017.12.036
M3 - Article
AN - SCOPUS:85043517827
SN - 1270-9638
VL - 75
SP - 115
EP - 127
JO - Aerospace Science and Technology
JF - Aerospace Science and Technology
ER -