Numerical simulation of high entalpy gas flows
- Paper number
IAC-06-C4.P.5.02
- Author
Dr. Sergio Elaskar, Universidad Nacional de Córdoba and CONICET, Argentina
- Coauthor
Mr. Oscar Falcinelli, Universidad Nacional de Córdoba and CONICET, Argentina
- Coauthor
Dr. José Tamagno, Instituto Universitario Aeronautico, Argentina
- Year
2006
- Abstract
Numerical results obtained using two software packages developed by the authors for solving inviscid, high enthalpy gas dynamics flow equations are presented in this paper. The first of the packages can simulate high enthalpy gas flows considering chemical equilibrium compositions. Its numerical approach is based on a finite-volume technique for solving the Euler equations, and on the evaluation of the numerical fluxes using the Harten-Yee TVD scheme and the flux vector splitting method. This software works on non-structured meshes and a locally aligned coordinated system is used for solving Riemann problems in a direction normal to cell interfaces. To show the capability of the numerical scheme it has been applied first, to the 3D Takayama test, and second, to a blunt body-cylinder configuration immerse in hypersonic flows. The second software package solves the 1D, non-steady gas dynamics Euler equations coupled with finite rate chemistry. The numerical approach uses a finite-volume Harten–Yee TVD scheme, also. To track gas interfaces a Riemann solver is implemented and to reduce the number of computing nodes without smearing the interfaces, a moving mesh is used. The source terms arising from the finite-rate chemical kinetics and vibrational relaxations, make the algorithm too stiff to be advanced explicitly. To avoid this stiffness an implicit treatment of these source terms is considered. Numerical simulations showing the potential of the computer code for the prediction of fluid mechanic properties and the chemical composition of the flow inside pulse facilities are presented.
- Abstract document