DSMC-IP 방법을 이용한 삼차원 희박기체 유동 해석

Abstract

In the present study, the information preservation(IP) method was employed to the three dimensional direct simulation Monte-Carlo(DSMC) solver to simulate the low-speed rarefied gas flows efficiently. It was known that the IP method can reduce the statistical scatter problems of the DSMC method. Firstly, the verification of the DSMC solver was conducted to compare with the results of the DSMC-IP solver. After that, two cases of flow problems were simulated by the developed DSMC-IP solver. One is the thermal diffusion flows, and the other is the low-speed flows around the sphere. To find the effects of the IP method, the both cases were calculated by the pure DSMC method using same number of sampling of particles. Through the results of the thermal diffusion flows, it was found that the temperature scatters were reduced in the results of the DSMC-IP solver by comparing with the results of the pure DSMC solver. It was also shown that the velocity scatters decreased in the results of the IP method from the sphere problems. In addition, it was observed that the IP method gets the reasonable results using a relatively less number of sampling of particles than the pure DSMC method. As a result, it was obtained that the developed DSMC-IP solver is a more efficient method for the low-speed rarefied gas flows than the pure DSMC solver.