TWO DIMENSIONAL NUMERICAL SIMULATIONS FOR COMPRESSIBLE FLOW IN THERMO-CHEMICAL EQUILIBRIUM

SALDÍA, JUAN; ELASKAR, SERGIO; TAMAGNO, JOSÉ

Mendoza

Congreso; ENIEF 2013; 2013

Asociación Argentina de Mecánica Computacional

In this paper, a finite difference scheme for the solution of the unsteady and steady, twodimensional Euler equations, considering working gas in thermo-chemical equilibrium, is presented.Three variations of the Total Variation Diminishing (TVD) Harten-Yee scheme are implemented. Oneof them is a technique based on the adaptive use of different limiter functions in each wave of the Rie-mann problem. With this technique, the undesired effects of the artificial viscosity on the capture ofcontact discontinuities are reduced, however without losing robustness in the non-linear waves resolu-tion. Therefore, this work is an extension of this adaptive scheme including gas in thermo-chemicalequilibrium. In order to verify the accuracy of the proposed scheme in the bidimensional case, resultsof the unsteady flows in cylindrical Riemann problems, and of the steady state solutions of hypersonicflow over a blunt body, are presented. Comparisons, considering the accuracy of the results and theconvergence properties, between the three Harten-Yee schemes are carried out.