> But when I refine (uniformly) the mesh, then the new mesh generated has
> not exactly a cylinder shape (see the figure in attachment).
> Is there a way to solve my mesh adaptation problem ?
> Thank you very much

The picture looks to me like not every face and edge of the input mesh has the 
boundary indicator set properly. Note that it is important that the edges 
that lie on the inner and outer cylinders also have the boundary indicator 
correctly -- it is not enough to just specify them for the faces!

Best
 W.

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

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