Question on KINSOL::SUNDIALS

[rru]

Dear dealii developers,

I have a quick question on non-linear solvers in dealii.

As far as I could gather, the only option for a newton solver is the wrapper SUNDIALS::KINSOL, and for DAE the wrapper SUNDIALS::IDA. Is that correct ?

In that event, is it possible to set up inequality constraints. In the documentation it is mentioned that the following "optional" functions can be supplied but syntax or description for them is not provided :

• get_lower_than_zero_constrained_entries()
• get_greater_than_zero_constrained_entries()
• get_lower_equal_than_zero_constrained_entries()
• get_greater_or_equal_than_zero_constrained_entries()

Regards,

Rochan

 

[Daniel Arndt]

Rochan,

there is Algorithms::Newton that can be used to set up a Newton method and there are multiple tutorial examples that deal with nonlinear problems. Have a look at step-15, step-25, step-44 and in particular step-42.

Best,

Daniel

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