Hi @Haris Hameed Mian In a nutshell, For LES (Large Eddy Simulation), the mesh size depends on the size of the eddies you aim to capture. Smaller mesh sizes are needed to resolve smaller eddies. Correspondingly, the time step should be chosen based on the highest frequency of the resolved flow structures. For DES (Detached Eddy Simulation), the mesh and time step requirements are less stringent than LES, as DES blends RANS and LES approaches, reducing the computational demand compared to pure LES. However, the mesh should still be fine enough in regions where LES is applied.

Hello Everyone! It is a great initiative such a community. I am a MSc in mechanical engineer focus on CFD. In the past 17 years, I worked with many different industries and CFD applications. Currently, I am the CAE manager of FS Dynamics in Hamburg. My interest in the group is to learn new things and eventually help people by sharing my experience from the practical side of CFD. Cheers, José