Interior Regeneration based on solution gradients, differences and specified ranges of the field variables adds additional elements in regions where the solution data indicates extra points are needed to properly model the flow physics. The solution is analyzed to automatically compute new length scales that are then used to generate a new hybrid mesh.
Many times, the initial grid does not have sufficient resolution to properly resolve all flow features of interest. Regeneration can be used to add additional clustering based on detected flow features so that they are better resolved by the solver. Features can be either detected based on edge gradients and differences of the field variables or based on a user specified range of their values.