WALEモデルを用いた円管内乱流のラージ・エディ・シミュレーションにおける格子解像度の影響

抄録

For large-eddy simulation (LES) of turbulent flow within a realistic computational time, assessment of the accuracy of subgrid scale model, especially in the case where the computational grid is very coarse is of significant importance. We perform a comprehensive grid resolution study of the WALE model in a turbulent pipe flow. The LES is performed under a constant flow rate at the bulk Reynolds number of 5300. The results show that the turbulent statistics such as the mean velocity profiles and the second order moments significantly depend on the spanwise grid resolution, while less sensitive to the streamwise grid resolution. Moreover, the statistics are reasonably well reproduced using only 6 computational points in the radial direction if only the first computational point is located within 5 wall units from the wall.