Hybrid DSMC-CFD Simulations of Hypersonic Flow over

A hybrid particle-continuum computational frame-work is developed and presented for simulating hyper-sonic interacting flows, aimed to be faster and more accurate than conventional numerical methods. The framework consists of the direct simulation Monte Carlo-Information Preservation (DSMC-IP) method coupled with a Navier-Stokes solver. Since the DSMC-IP method provides the macroscopic information in each time step, determination of the continuum fluxes across the interface between the particle and contin-uum domains becomes straightforward. Numerical experiments of hypersonic flows over a simple blunted cone and a much more complex hollow cylinder-flare are conducted. The solutions for the two geometries considered from the hybrid framework are compared in detail with pure particle calculations. It is con-cluded that the hybrid method basically works very well. Numerical accuracy improvement is achieved in simple flows but unclear in complex flows. It is also concluded that the numerical efficiency obtained with the hybrid method is far from satisfactory. Overall, the hybrid framework provides a foundation for future development