# Grid Independence Study

Is the change in time step necessary for the grid independent study? As the CFL is based on the relation between dt and dx. In mesh independent study, only change should be mesh i.e, dx isn't it so?

• If you are using an explicit scheme, then you have to reduce the time step size whenever you refine the mesh. Otherwise, the solution will blow up due to instabilities. This is not necessary for an implicit scheme. Aug 13 '20 at 20:39
• Oh yeah, understood. An explicit scheme is used. Thanks a lot. Aug 14 '20 at 8:27