Since anisotropic adaption is available only for specific cell types, the following limitations exist:
It is only available in 3D.
It only works for hexahedral cells or prism cells.
Each cell can only be split into two, with a given splitting ratio in the normal direction of the boundary face. Multiple layers can be achieved by multiple refinement.
Each cell to be split can only be reached once from any of the boundary faces, otherwise, the refinement will not be processed.
Unlike other adaption functionalities, the subdivided cells cannot be coarsened again, because all the cells that are adjacent to the refined cells are converted into polyhedral cells.
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