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Consistent Continuum-Particle Modeling of Hypersonic Flows and Development of Hybrid Simulation Capability

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Technical Report

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University of Minnesota Minneapolis United States

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Space vehicles re-entering the atmosphere generate flow conditions that range from highly rarefied to fully continuum. However, even within a continuum flow, there may exist regions of flow that are locally rarefied leading to strong non-equilibrium. These local areas of non-equilibrium are generated around sharp leading edges, within shock waves, wake regions, and boundary layers or are exhibited in rocket plumes in space. For accurate simulation of such flows, a hybrid CFD-DSMC technique is required. While great strides have been made in developing a robust hybrid method, further work is necessary before a single hybrid hypersonic tool capable of 3D, parallel simulations, employing high fidelity chemistry models can be completed. In particular, two advancements are necessary the hybrid method must be extended to fully 3D complex geometries with scalable parallel performance, and vibrational, chemical, and ultimately weak ionization models must not only be incorporated but also made physically consistent between the CFD and DSMC components. The current proposal focuses mainly on the second advancement, demonstrating full consistency between CFD and DSMC solutions for chemically reacting flows in the near-continuum regime. The proposed work will demonstrate such consistency for the first time and demonstrate preliminary de-coupled hybrid CFD-DSMC solutions for challenging flows.

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  • Fluid Mechanics

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