CFD simulation of Flow Turbulence and Routine Analysis of a Split Type Spacers Grid Mixing Vanes in A 5X5 PWR Rod Bundle Using ANSYS CFX

Abstract

Spacer grids are essential for mechanical performance along the rods of the core. Spacer grids are always in a systematic square shape. It is significant to enhance the features of the grid with the vanes since the sublime coolant mixing and less pressure drop and must be permitted to the thermal hydraulic model. Researchers have used Computational Fluid Dynamics (CFD) in 3D Reynolds Averaged Navier-Stokes (RANS) and k-ε turbulence model study with ascendable wall function skillfully as a supporting means in the evolution of spacer grids along the rods. Korean Atomic Energy Research Institute (KAERI) MATiS-H facility performed CFD evaluation of a (5x5) bundle of rods experiment which is submitted. Simulations were made in OECD/NEA CFD Standard application. The effect of turbulence in spacer grid geometries in a PWR (pressurized water reactor) is offered and also the impacts of results are evaluated. At reactor stream features and reactor close power three dissimilar vane arrangements are simulated and average thermo-fluid dynamic parameters are assessed. To simulate the characteristics of the flow among the rods and vanes, a tetragonal mesh is created. The simulations are performed with the CFD code of CFX 15.