Wind Thermo-Chemical Models and Recent Improvements

Abstract

The thermochemical and transport models contained in the Wind computational fluid dynamic (CFD) code have been modified and extended over the last several years. This paper documents these updates; included are improvements to thermodynamics models, the addition of an effective binary diffusion model, and improved numerical solution of the chemical source terms. Implementation of the newest NASA thermodynamic curve fits is described including computation of multicomponent properties derived from these functions. Computation of transport properties from the Lennard-Jones parameters and the subsequent computation of the multicomponent effective binary diffusion coefficient are presented. Implementation of the parasol method for solving the species conservation equations with chemical source terms is described. Speciesdependent, third-body efficiency that previously has been available in only one reaction model has been included in all the reaction models. The influence of third-body efficiency is investigated for supersonic reacting flow over a Mach 4.0 wedge. Computational results comparing the effective binary diffusion model and the Wilke model are presented. Nomenclature