基于复杂接续面的蒙特卡罗接续计算方法研究

为了提高大型复杂问题的计算效率，提出一种适用于具有多个空间区域表面与复杂曲面型表面结构体的蒙特卡罗接续计算方法。该方法以结构体外边界面作为接续面源进行接续计算，将写源过程的计算结果与接续过程的计算结果之和作为计算的最终结果；该方法通过一次写源计算与多次接续计算，避免直接计算过程中对相同结构的重复计算，大大提升了计算效率。以MCNP程序建立典型反应堆结构计算模型，以该接续计算方法进行4种结构方案的计算，并与直接计算方法的计算结果进行对比。结果表明，该接续计算方法的计算结果与直接计算的计算结果一致，且使用该方法比直接计算方法在效率上取得了约3倍的提升效果。因此，本研究提出的蒙特卡罗接续计算方法对于涉及大量重复计算的大型复杂问题可以取得显著的效率提升。

Monte Carlo continuation calculation method based on complex intermediate surfaces

In order to improve computational efficiency of large and complex problems, a Monte Carlo Continuation Calculation method is proposed for structures with multiple spatial surfaces and complex curved surfaces. In this method, the external boundary of the structure is used as the source for the continuation calculation, and the sum of the calculation results of the source writing process and the continuation calculation process is taken as the final result. In terms of efficiency improvement, the method can avoid repeated calculation of the same structure in the process of direct calculation by means of one source writing process and several continuation calculation processes, which greatly improves the computational efficiency. A typical reactor structure calculation model is established by MCNP, and the continuation calculation results of four structural schemes are compared with those of direct calculation method. The results show that the calculation of the continuation method is consistent with those of the direct method, and the efficiency of the continuation calculation method is about three times higher than that of the direct calculation method. Therefore, the Monte Carlo continuation Calculation method proposed in this study can achieve significant efficiency improvement for large and complex problems involving a large number of repeated calculations.