Accession Number : AD1051372

Title :   Demonstration of Hybrid DSMC-CFD Capability for Nonequilibrium Reacting Flow

Descriptive Note : Technical Report

Corporate Author : University of Minnesota Minneapolis United States

Personal Author(s) : Schwartzentruber,Thomas E

Full Text :

Report Date : 09 Feb 2018

Pagination or Media Count : 28

Abstract : New direct simulation Monte-Carlo (DSMC) and computational fluid dynamic (CFD) models were developed for integration into MGDS and US3D simulation codes. The models are based on new ab-intio rate data obtained using state-of-the-art potential energy surfaces for air species. A probability model (cross-section model) is developed for use in DSMC, and the model analytically integrates to a closed-form model for use in CFD. The model includes the coupling between nonequilibrium (non-Boltzmann) internal energy distributions and dissociation. CFD simulations of the Hollow Cylinder Flare geometry were performed, which involves high-enthalpy flow over a sharp leading edge. Conditions matched recent experiments performed in the CUBRC Lens-XX facility. This flow was chosen since a recent blind-code validation exercise revealed differences in CFD predictions and experimental data that could be due to rarefied flow effects. The CFD solutions (using the US3D code) were run with no-slip boundary conditions and with slip boundary conditions.

Descriptors :   computational fluid dynamics , PROBABILISTIC MODELS , geometry , enthalpy , BOLTZMANN EQUATION

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE