PERFORMANCE OF POLYHEDRAL MESH IN LARGE-EDDY SIMULATION OF FLOW AND TEMPERATURE FIELDS WITHIN A CUBIC ARRAY IN UNSTABLE BOUNDARY LAYER

抄録

The wind and temperature fields around a cubic array in unstable boundary layer were simulated by large-eddy simulation. This study aimed to evaluate the performance of polyhedral meshes with local mesh refinement andthe effect of boundarylayer meshes on the characteristics of wind velocity and temperature fields within a focused area. A precursor simulation was conducted to obtain wind and temperature fluctuations for the inflow boundary conditionin the unstable boundary layer. After validation,four cases with differentpolyhedral mesh arrangements were compared. The polyhedral cases with local meshrefinement showed comparable accuracy with the orthogonal case. The boundarylayer meshes on the groundand surfaces of cubic building models improved the accuracy of the wind and temperature fields near the surfaces.