A Vectorized Particle Simulation for Study of Modeling of Collisional Energy Transfer

摘要

In this paper, a vectorized particle simulation for study of modeling of collisonal energy transfer in a hypersonic reacting flow is developed to analyze the michanism and effects of thermochemical nonequilibrium in the mecroscope view. A modified modeling of molecular collisional energy transfer is presented to simulate chemical kinetic processes in high temperature air flow for a SIMD supercomputer to demonstrate the greatly improved computational efficiency of DSMC method. The work focused on finding a collision - selection rule for a better balance between algorithmic complexity and total number of particles employed in simulation processes, which is used to statistically control the selection of both the chemical reaction modes and number of colliding particle pairs. Effective collisional energy transfer models suited for the vectorized particle simulation are dealed with attention to internal energy modes contribution for relaxation processes. Verification of the models is made throgh calculating the hypersonic stagnation stramline flow in thermochemical nonequilibrium.