Reply To: Problem in Simulation with higher Reynolds number in Cylinder3d
You need to adjust the resolution depending on the Reynolds number to keep the simulation stable. In this particular example you want to ensure that the lattice velocity doesn’t exceed ~0.1. You can adjust the resolution right above the line where you changed the Reynolds number. For more details on stability and other LBM basics you can check out e.g. the book by Krüger et al.
Using a LES model may also be of interest in your case (if you want to target even higher Reynolds numbers).