CANDU慢化剂排管容器贴体网格生成技术

Body-fitted grid generation technology for CANDU moderator calandria

为了对CANDU核反应堆慢化剂排管容器的计算流体力学进行分析,在比较Laplace方程、Poisson方程和Helgenstock网格法的基础上,分析了慢化剂排管容器生成二维计算网格的结构贴体网格生成技术.采用系数法和Helgenstock方法调节网格位置和正交性,编制相关的计算程序,采用该方法和计算程序生成了描述慢化剂排管容器的结构贴体网格.实验结果表明,该网格既能准确描述圆形边界,又适合对中心正方形棒束区采用多孔介质法开展数值计算.

Body-fitted grid generation technology of moderator calandria was discussed based on the comparison of Laplace, Poisson and Helgenstock grid generation methods in order to analyze the flow and heat transfer in the moderator calandria of the CANDU nuclear reactor by the computational fluid dynamics （CFD） calculation. The large-parameter method and Helgenstock method were used to adjust the location and orthogonality of the grid. The computer codes were developed. The body-fitted grid was generated by these methods for the CANDU moderator calandria. The experimental results show that the grid can exactly describe the boundary of the moderator calandria and is suitable for simulating the quadra-lattice bundles in the center of the moderator calandria by the porous media method.