Verification of GAMMA+ for Multi-Dimensional Heat Transfer in a Prismatic Core

The recent research for the GAMMA+ development is focusing on the verification and validation study. In 2016, an official report on the verification and validation of GAMMA+ for conceptual problems was issued. The conceptual problems consist of fluid flow problems, heat conduction problems, thermo-fluid conjugated problems, and thermo-fluid transient problems. The verification and validation of GAMMA+ for integrated problems are under progress. One of main concerns of the present work is to verify the application of hybrid grids (i.e, mixture of hexagonal, triangular and cylindrical grids) for a prismatic core. A commercial computational fluid dynamics code (CFD) has been used to verify the results of the GAMMA+ code. In this work, in order to verify the GAMMA+ capability for multi-dimensional heat transfer in a prismatic core, a simplified benchmark was proposed and the GAMMA+ and CFX calculations were conducted. The results of the calculation show that the data calculated by GAMMA+ agree well with the data obtained by CFX. It is concluded, therefore, that the GAMMA+ code can reliably simulate multi-dimensional heat transfer in a prismatic core.