Hello everyone! I used the matrixfree to solve a solidificatio phase field problem. I think I have no way to change the value in the local matrix and right hand side. And I'm trying to use a variable substitution. ie .the old numerical solutiuon(phi) is in the range of [-1,1]. I used psi(x) = sqrt(2.0) * atanh(phi(x)) to replace the old value phi. the solution will become linear in the hole domain , psi will be very large when the point is far away from liquid/solid interface . So I want to limit psi in a range .for example[-10,10]
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