Nonequilibrium Flows
A Methodology for Hybrid Simulation of Rarefied and Continuum Flow Regimes
Ladeinde, F., Cai, X. and Agarwal, R., Aerospace Science and Technology 75, pp. 115-127
(2018);
https://doi:10.1016/j.ast.2017.12.036
Abstract
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.
Fig. 12. Translational temperature for hypersonic flow over a sphere. (For interpretation
of the references to color in this figure legend, the reader is referred to the web
version of this article.)
Related Papers
- Ladeinde, F., Cai, X., and Agarwal, R., “A Methodology for Hybrid Simulation of Rarefied and Continuum Flow Regimes,” Aerospace Science and Technology (Journal), Vol. 75, pp. 115-127, (2018), https://doi:10.1016/j.ast.2017.12.036
- Wenhai Li and F. Ladeinde. “Analysis of Interacting, Under-Expanded, Rarefied Jets,” AIAA Journal, Vol. 49, No. 11, pp. 2581, (2011), https://doi10.2514/1.J050860
- Ladeinde, F., Cai, X., and Agarwal, R., "On the Stability of Higher‐Order Continuum (HOC) Equations for Hybrid HOC/DSMC Solvers," AIP Proceedings, Vol. 762, no. 1, pp. 535-540, (2005), http://dx.doi.org/10.1063/1.1941591
