Aerodynamic and Aerothermal Simulations of Mars Concept Vehicles Using Overset DPLR

[摘要] NASA's Descent System Studies (DSS) Program is studying various concept vehicles to enable landing of heavy payloads on the surface of Mars. While it is desirable to run high-fidelity CFD simulations to accurately assess the aerodynamic and aerothermal effects of various design changes during EDL, it is usually difficult to quickly generate high-quality grids suitable for such analyses. One approach to address this bottleneck in mesh generation is through the use oversetting grids. Although the overset approach is efficient and powerful in solving partial differential equations on complex geometries, new users often find it challenging to apply overset concepts for their simulations. For example, generating hyperbolic grids with sufficient overlap; priority in hole-cutting on multiple overlapping grids; and fixes to assemble overlapping viscous grids at the body surface. The objective of this presentation is to introduce a simple process that combines the advantages of near-body, point-matched, structured grids with oversetting background grids suitable for grid alignment. This approach allows for grids that can be sequenced, reclustering of mesh spacing at the wall, and grid alignment with the bow shock. The current methodology is tested on a Mid-L/D configuration using the overset DPLR code.

[发布日期] 2019-08-26

[学科分类] 力学，机械学

[关键词] AEROTHERMODYNAMICS;ALIGNMENT;COMPUTATIONAL FLUID DYNAMICS;DESCENT;PARTIAL DIFFERENTIAL EQUATIONS;FINITE VOLUME METHOD;NAVIER-STOKES EQUATION;PAYLOADS;COMPUTERIZED SIMULATION;GRID GENERATION (MATHEMATICS);STRUCTURED GRIDS (MATHEMATICS)