A Scalable Gas-Particle Flow Simulation Tool for Lander Plume-Surface Interaction and Debris Prediction

Spacecraft propulsive landings on unprepared regolith present in extra-terrestrial environments pose a high risk for space exploration missions. Plume/regolith interaction results in (1) the liberation of dust and debris particles that may collide with the landing vehicle and (2) craters whose shape itself can influence vehicle dynamics. To investigate such gas-granular interactions for large-scale problems using standard Lagrangian approach, particles on the order of billions would need to be modelled to account for large landing areas, making the approach impractical. An effective alternative is to use an Eulerian-Eulerian approach where the granular mixture is represented using a two-fluid model and the granular material physics are considered using constituent relations. This effort aims to provide a state-of-the-art Eulerian-Eulerian approach with novel granular material models in the highly scalable computational framework Loci used by NASA engineers. At the end of Phase I, a massively parallel Loci-based version of a gas-granular flow solver featuring compressible flow, single gas species, and novel granular material models for spherical and irregular (single-component) particle mixture will be developed and demonstrated, with a TRL starting at 2 and ending at 4. Phase II effort will add higher model fidelity to the gas phase with a multi-component approach, an extension of the granular models for poly-disperse mixtures, overset-mesh with six degrees-of-freedom for lander vehicle motion, and compatibility to other Loci-based tools and modules such as CHEM.