基于CAD的中子输运计算特征线法初探
Preliminary study on CAD-based method of characteristics for neutron transport calculation
摘要：
近几十年来，特征线法（MOC）被广泛应用于中子输运计算。然而，如何将有效的几何建模方法与MOC相结合，是决定MOC能否应用于高度异构几何的关键问题。这就给复杂几何体的几何建模和光线跟踪带来了困难。本文介绍了一种新的粒子输运几何建模和射线追迹方法，该方法利用FDS团队开发的基于CAD/图像的中子学和辐射输运自动建模工具MCAM，克服了上述局限性。将菱形差分格式应用于MOC中，以减小平面通量近似的空间离散误差。在MCAM和MOC的基础上开发了新的MOC代码，并将其集成到SuperMC系统中，SuperMC系统是一个用于中子学和辐射模拟的超级多功能计算系统。计算结果表明了该方法在MOC中子输运计算中的可行性和有效性。
英文摘要：
The method of characteristics (MOC) is widely used for neutron transport calculation in recent decades. However, the key problem determining whether MOC can be applied in highly heterogeneous geometry is how to combine an effective geometry modeling method with it. Most of the existing MOC codes conventionally describe the geometry model just by lines and arcs with extensive input data. Thus they have difficulty in geometry modeling and ray tracing for complicated geometries. In this study, a new method making use of a CAD-based automatic modeling tool MCAM which is a CAD/Image-based Automatic Modeling Program for Neutronics and Radiation Transport developed by FDS Team in China was introduced for geometry modeling and ray tracing of particle transport to remove those limitations. The diamond -difference scheme was applied to MOC to reduce the spatial discretization errors of the flat flux approximation. Based on MCAM and MOC, a new MOC code was developed and integrated into SuperMC system, whic h is a Super Multi-function Computational system for neutronics and radiation simulation. The numerical results demonstrated the feasibility and effectiveness of the new method for neutron transport calculation in MOC.
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