Improvement of sub-grid model in large eddy simulation and applications in turbulent channel flow

If large eddy simulation method is used to calculate the turbulent channel flow with strong shear, the commonly used sub-grid stress models, including wall modification model, will generate excessively high mean velocity profiles. It indicates that sub-grid stress model cannot describe the situation nearby the wall. To this end, the wall function of the sub-grid Reynolds stress model was modified to obtain a better result. The mean velocity profiles, the RMS(root-mean-square) velocity profiles and Reynolds stress profiles calculated by the modified model are consistent with the results of DNS.