5 votes
Accepted

Why FEM for incompressible materials is ill-posed?

For incompressible materials, as the extent of incompressibility increases, the bulk modulus approaches infinity (for the isotropic case). This is what causes ill-conditioning. Consider the case of ...
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1 vote

ON the Kronecker product form of the laplacian matrix

I think your question is too general. In 1D the discrete linear FE operator often recovers the linear centered FD one, however this is not always the case. For DG you additionally have consider the ...

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