Preliminary study on CAD-based method of characteristics for neutron transport calculation

Our new method makes use of a CAD-based automatic modeling tool, MCAM, for geometry modeling and ray tracing of particle transport in method of characteristics (MOC). It was found that it could considerably enhance the capability of MOC to deal with more complicated models for neutron transport calculation. In our study, 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 2D MOC code was developed and integrated into the SuperMC system, which 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.     

Preliminary study on CAD-based method of characteristics for neutron transport calculation

Our new method makes use of a CAD-based automatic modeling tool, MCAM, for geometry modeling and ray tracing of particle transport in method of characteristics （MOC）. It was found that it could considerably enhance the capability of MOC to deal with more complicated models for neutron transport calculation. In our study, the diamond-difference scheme was applied to MOC to reduce the spatial discretization errors of the fiat flux approximation. Based on MCAM and MOC, a new 2D MOC code was developed and integrated into the SuperMC system, which 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.     

基于SALOME的蒙卡计算模型CAD反转可视化

基于开源SALOME平台,采用以体代面思想和栅元层次多叉树方法,开展蒙卡计算模型CAD反向转换及三维可视化研究。基于本文方法开发了CAD反转可视化程序模块SALOME-MC,模块可实现蒙卡计算模型几何建模、材料建模和三维可视化等功能。选取三种典型反应堆蒙卡计算模型对本文方法和程序进行测试验证,测试结果表明,本文方法和程序可妥善处理蒙卡计算模型的复杂几何体与大规模重复结构,并精准地实现蒙卡计算模型CAD三维反转可视化,证明SALOME-MC的蒙卡计算模型反转能力和可视化效果的正确性与可靠性,提高了蒙卡计算模型几何建模效率和展示度。