Hello, Is there a way to set bounds on the solution of a NonLinearProblem instance in dolfinx, that is an equivalent of the set_bounds option in dolfin. The syntax was as follows. problem = NonLinearVariationalProblem(F,u,bc) problem.set_bounds(u_min, u_max) Thank you Krishna

I am no expert on this either but variational inequalities in general are tricky and not as trivial as setting the bounds to what you are getting without any constraints. In particular, you may want to take a look at projected newton methods, e.g. 0307305.pdf 526.37 KB …

Set bounds in a NonLinearProblem

dolfinx

nate April 7, 2022, 1:32am 4

Read up on SNESVISetVariableBounds particularly with regard to the SNESType and Section 2.4.2 of the PETSc Manual.

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Set bounds in a NonLinearProblem

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