[petsc-users] Nonlinear solver for non-smooth jacobian

[Jed Brown]

Que Cat <quecat001 at gmail.com> writes:

> Hello Jed,
>
> Thank for the information. I would take your first advise. Does SNESVI have
> the same functionality as TAO complementary solver? 

They are related, but not the same.  SNESVI problems do not have to
correspond to energy minimization, but it does need a well-posed
variational inequality.  Note that you can't simply take PDE +
constraints and assume that it corresponds to a well-posed VI.  There
are examples of SNESVI.
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