自适应网格加密在热工水力系统程序中的应用

The Application of the Adaptive Mesh Refinement to the Thermal Hydraulic Program

反应堆热工水力系统程序对核电站设计与安全分析有着重要的意义。尽管这些程序发展多年已经相当成熟,但依旧存在由各个方面引入的误差。自适应网格已经在各种工程问题与物理问题中广泛应用,而在现有的热工水力系统程序中依旧少见。在某些瞬态,计算过程中网格尺度对于计算精度与计算效率有严重的影响,而自适应网格能在一定程度上降低网格分布不当带来的影响。本文初步将局部网格加密技术应用到了热工水力系统程序中,优化计算结果。以faucet flow问题为例验证了自适应网格加密技术的可行性与有效性。与均匀网格相比,使用自适应网格加密算法显著地提高了计算精度与效率。

The adaptive mesh method has been widely used in solving engineering problems to improve the computational accuracy.But it’s still rarely applied in existing thermal hydraulic system codes.The mesh distribution would i MPact the calculation accuracy and efficiency when solving some two phase flow problems.The adaptive mesh method would reduce the i MPact of the mesh distribution to some degree.In this paper,a local mesh refinement method is applied to a thermal hydraulic program of a system code to optimize the simulation result.The faucet flow problem is carried out to verify the effect of the mesh refinement.The adaptive mesh refinement method improves the computation accuracy and efficiency compared with result of the uniform mesh.