Modeling of Processes in Gases in Shock Tubes with Consideration for Internal Degrees of Freedom by Using the Direct Simulation Monte Carlo Method

摘要

Parallel calculations within the framework of the direct simulation Monte Carlo method were performed on multiprocessor computers using the block decomposition of the simulation region. At the initial moment, the driver section of the shock was filled with a gas with a molecular mass identical to that of H-2 while the driven section was filled with a mixture of gases with molecular masses identical to those of Xe, O-2, He, and H-2 and a ratio of molar concentrations of 1 : 10 : 169 : 20. Simulations were performed using a simplified description of the rotational and vibrational degrees of freedom of the molecules. A model with energy sink was used. The width of smearing of the post-shock flow boundary adjacent to contact surface was determined and shown be to time-independent within the statistical scatter over the entire duration of simulations. It was revealed that the concentrations of O-2, Xe, and He in the post-shock flow region adjacent to the contact surface were substantially higher over the entire time of flow existence. This effect was not observed when the internal degrees of freedom were disregarded.