Leo BASOV, Martin GRABE

DOI Number: N/A

Conference number: HiSST-2025-133

In this work we present a numerical analysis of a nitrogen plume impinging on a flat plat via the Direct Simulation Monte Carlo (DSMC), Fokker–Planck (FP), as well as hybrid FP–DSMC methods. We show that the hybrid–FP approach can produce numerical results very close to the DSMC solution while having a computational cost close to that of a FP only simulation. In the hybrid simulation the maximal deviation to DSMC results in the temperature plume center line profile is reduced from 49.1 % to 7.3 % while the deviation in the surface heat flux could be reduced from 14.2 % to 3.9 % when compared to an FP only simulation. This was achieved with a minimal increase of computational time of 13.4 %
when compared to pure FP simulation. The hybrid simulation only took 16.1 % of computational time when compared to DSMC simulation showing that hybrid–FP simulation can be qualitatively high with a relatively low computational cost for certain test cases. These results could be achieved without additional speed up measures like variable particle weights, model specific grid refinement or local time stepping.

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In Categories: 1.Events, 1.HiSST 2025, High-Speed Aerodynamics and Aerothermodynamics with application to hypersonic regimes
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