Demonstration of Capability to Simulate Particle Irregular Shape and Poly-Disperse Mixtures within Lunar Lander Plume-Surface Interaction
Publication: Earth and Space 2022
ABSTRACT
Plume-surface interaction (PSI) between lander engine plumes and regolith soil creates hazards in obscuration and contamination by particle clouds, high-energy ejecta streams, and landing area cratering damage. The gas-granular flow solver (GGFS) enables coupled gas-particle two-phase flow simulations to predict the range of PSI effects from onset of surface erosion to deep crater formation. GGFS features an Eulerian-Eulerian modeling approach, treating both gas and granular material as interacting continuum phases. Eulerian granular material flow modeling requires closure formulations for the granular material constitutive models (stress, friction, collisional and kinetic energy dissipation, drag, etc.). Modeling the lunar regolith granular characteristics poses special challenges due to complex particle shapes and mixture composition. The integration and maturation of the constitutive model database generation process into the GGFS simulation framework are proceeding under funding by the NASA Game Changing Development program. The status of current capabilities in modeling particle shape and mixture effects is presented in comparisons of crater characteristics predicted in Apollo LM plume-surface interaction simulations.
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Earth and Space 2022
Pages: 64 - 75
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Published online: Jan 5, 2023
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