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放气污染对航天器造成的有害影响需要定量评估。放气产物分子的输运过程可以采用Monte-Carlo方法模拟,并用射线表示放气分子输运轨迹。如此一来,即转换为射线追踪问题。由于航天器构型复杂,射线追踪的计算很耗时,所以有必要研究其加速算法。文章将复杂构型航天器表面用三角形非结构网格表示,利用八叉树划分技术开展分子运动轨迹与表面相交的加速模拟计算。同时,在基于共享内存多核计算平台,利用OpenMPAPI软件实现了计算的并行化。该方法在对空间站的实例计算中显著提高了运算速度,并对空间站的污染情况进行了初步评价分析。
The detrimental impact of detonation pollution on spacecraft requires a quantitative assessment. The transport process of deflated product molecules can be simulated by Monte-Carlo method, and the ray is used to indicate the transport path of deflated molecules. This translates into ray tracing issues. Due to the complex configuration of spacecraft, ray tracing calculation is time-consuming, so it is necessary to study its acceleration algorithm. In this paper, the surface of the complex configuration spacecraft is represented by a triangular unstructured grid. The octree partitioning technique is used to carry out the accelerated simulation of the intersection of the molecular motion trajectory and the surface. At the same time, based on the shared memory multi-core computing platform, the use of OpenMPAPI software to achieve the parallelization of computing. The method significantly improves the calculation speed in the instance calculation of the space station and carries out a preliminary evaluation and analysis on the pollution of the space station.