Numerical simulation and verification of the flow around a surface mounted cubic body placed in a fully developed turbulent channel flow

摘要

In the paper detailed investigations of the flow structures around a cubic body in a turbulent channel flow at high Reynolds numbers are carried out by means of a large-eddy-simulation (LES). Special attention is turned to the resolution of secondary structues of the field which up to now could not be resolved by numerical calculations. By simplification of the subgrid energy equation and the development of fast Poission solvers efficient calculation teimes are reached. Due to the correct approximation of the velocity gradients at the sharp edges of the body the shape and the size of the numerical deterined separated flow regions agree very well with corresponding experiments. To resolve the details of the flow in the immediate neighourhodd of the cubic body the implementation of a local mesh refinement procedure in the code was necessary. For this a concept of locally embedded grids was developed. With the code described in the paper the following progress was made: