You can deal with dynamic mesh adaption to just refine based on flow solution the regions of mesh of interest. If you are working with PBS and not using a SRS method for turbulence modeling in Fluent there is no courant number limitation (implicit solver) so that a moderate value larger than 1 but still fair enough to resolve the transient effects and reduce the stiffness of matrix solution.
You can restart from any backup file if you have one stored. If not then please always let Fluent make an autosave for future runs.
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