In this paper, the coupling of fine-mesh computational fluid dynamics (CFD) thermal-hydraulics (TH) code and neutronics code is achieved using the Ansys Fluent User Defined Function (UDF) for code development, including parallel meshing mapping, data computation, and data transfer. Also, some CFD schemes are designed for mesh mapping and data transfer to guarantee physical conservation in the coupling computation. Because there is no rigorous research that gives robust guidance on the various CFD schemes that must be obtained before the fine-mesh coupling computation, this work presents a quantitative analysis of the CFD meshing and mapping schemes to improve the accuracy of the value and location of key physical prediction. Furthermore, the effect of the sub-pin scale coupling computation is also studied. It is observed that even the pin-resolved coupling computation can also create a large deviation in the maximum value and spatial locations, which also proves the significance of the research on mesh mapping and data transfer for CFD code in a coupling computation.

在本文中，使用 Ansys Fluent User Defined Function (UDF) 实现了精细网格计算流体动力学 (CFD) 热工液压 (TH) 代码和中子学代码的耦合，用于代码开发，包括并行网格映射、数据计算、和数据传输。此外，一些 CFD 方案设计用于网格映射和数据传输，以保证耦合计算中的物理守恒。由于没有严格的研究对精细网格耦合计算之前必须获得的各种 CFD 方案给出强有力的指导，因此本工作对 CFD 网格划分和映射方案进行了定量分析，以提高数值和位置的准确性。关键物理预测。此外，还研究了子引脚尺度耦合计算的影响。