I am trying to use STAR-CCM+ to compute the flow-induced vibration problem of a bent pipe and hope to capture the pulsating forces of turbulence on the pipe structure. The entire model consists of a simple elongated bent pipe with conventional mass flow inlet and pressure outlet. However, on one hand, I understand that the results of LES are closely related to the mesh. The advice I found in the documentation suggests constraining the mesh size using the Taylor scale and Kolmogorov scale. In this case, the calculated mesh size should be on the order of 10 to the power of negative six. Such a fine mesh exceeds the computational capabilities of my device. But since the structure is relatively simple, do I still need such a fine mesh to support my calculations? On the other hand, I am not very familiar with the actual role of the CFL condition and WALE subgrid scale in the solver. It seems that in STAR-CCM+, I can independently set the CFL condition and solve the time step. Is this reasonable? And can the WALE subgrid scale help relax the requirements on the mesh size?