Hi,

I would like to solve a Stokes problem with a viscosity which is not constant and could be high in some parts of the domain (as in sinker problem). The solvers that I want to use are in this article:

http://dx.doi.org.ezproxy.math.cnrs.fr/10.1016/j.cam.2013.10.016

I would like to use a P0 interpolation for the viscosity function.

Could you tell me how can I set this function into my variational formulation ?

The other question is to construct the S matrix when you use the Schur complement as a preconditioner. I have to set the pressure mass matrix for S and scale it with the inverse of the viscosity. How can I do that ?

Thanks,
Loic

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