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Hello everyone, I would like to ask if there is any special requirement in order to determine the proper timestep for simulation that use ALE Mesh + Free surface. Usually, i calculate my timestep using Courant number = 0.5, but still after sometimes the simulation crash with error: Severe mesh distortion; must reduce time increment. Is there any proper/correct formula to calculate timestep size for these condition? *I am simulating a vibrating cylinder. free stream velocity: X-direction active cylinder motion: Y-direction