Timo,

> So, what are you using and do you have any advice for me? Surely,
> someone had a similar problem already? :-)

GridRefinement::refine_and_coarsen_fixed_{number,fraction} have a trailing 
defaulted argument that specifies a maximum number of cells. It doesn't 
always hit the target exactly but at least it allows you to specify that it 
shouldn't refine cells above just because they are above a certain threshold. 
It stops when the number of projected cells is above the given maximum.

Best
 W.

-------------------------------------------------------------------------
Wolfgang Bangerth                email:            [email protected]
                                 www: http://www.math.tamu.edu/~bangerth/

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