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2
votes
1answer
143 views

Singular matrix for 2D stokes flow in finite differences

I have a problem by solving stokes flow in 2D by finite differences. I am using a marker and cell method, my scheme is o-------vx1.1-------o-------vx1.2-------o | | ...
5
votes
1answer
111 views

Are serendipity elements still polynomially complete when the quadrilateral is skewed?

I have not implemented these elements before, but I like their reduced cardinality compared to (e.g.) a tensor product of lagrange interpolants, which is very "overcomplete" (especially for orders>2) ...