Multigrid - gridtransfers
I'm working with multigrid in finite differences and finite volume colocated cartesian discretisations. Now I'm migrating to general (curvilinear) colocated grids with finite differences. However, I am having many dificulties in finding the restriction and prolongation operators for such situation. I have read dozens of references but I did not find it. Many people talks about but I never found it published. Could you please give me a reference where I can find it? High order operators (3rd and 4th) will be welcome too.
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