Abstract
In this work a wall-modeled LES is developed to solve the basic flow character over rough wall on high Reynolds number without resolving the details of the roughness elements. The averaged roughness shear stress can be combined with the smooth wall shear stress in the inner layer wall-model. The instantaneous shear stress caused by the roughness elements are calculated by the pressure projection and the elevation fields. The total shear stress is given back to the outer layer LES mesh as a new boundary condition. The comparison between simulation and the experiment reveals that the wall-modeled LES approach in this research is capable to predict the flow in rough wall boundary layer without resolving the detailed roughness element geometries.
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