VECTORIZATION OF A MONTE-CARLO SIMULATION SCHEME FOR NONEQUILIBRIUM GAS-DYNAMICS

The numerical performance of a Monte Carlo scheme used in the analysis of non-equilibrium gas dynamics has been greatly improved. This improvement is attained by careful implementation of the algorithm in order to take advantage of the vector hardware of supercomputers. The performance of the modified implementation is demonstrated by application to three different flow problems. First, the one-dimensional standing shock wave is considered. Due to the relative simplicity of this example, it is shown that an adequate solution is obtained in a very small computational time. The second problem considered is the flow of an expanding gas through an axisymmetric nozzle. Lastly, the hypersonic flow of argon over a three-dimensional wedge is computed. This problem illustrates the increase in the number of molecules which may be employed in the simulation due to the improved performance of the algorithm. In fact, over 10 million particles are employed which is the largest number reported in the literature for the simulation scheme considered. © 1991.