hi im modeling a floodplain with dry initial condition. to many cells the flag value(=2) shows the solution is diverging. i set the perimeter of 2D area to floodplain with 200x200m cell sizeand also have a refinement region in channel with 50×50 cell size. computational time is 5 mins and using diffusion wave equation with default max iterations of 20. kindly recommend some troubleshooting.
Your computational time (time step) is to large. Follow the guidance in the manual that discusses selecting the correct time step based on the Courant criteria.