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Bugfix/talamini/thermomechanics with state #1181

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@btalamini btalamini commented Jul 20, 2024

Note: this PR contains a breaking change. I'm not sure if we should merge or not. Please help in evaluating that, and please don't merge this until we come to a decision.

Our thermomechanics physics module did not account for self-heating due to internal dissipation. The material model interface does return the internal dissipation, but it had nowhere to go in the heat transfer residual. This PR adds in this missing effect.

The breaking change is that the heat transfer module now has internal state variables (that is, quadrature point data). The mechanics module has this design, but the heat transfer currently does not. Should the this facet of design be symmetric between physics modules? If so, should it be moved into the base class, to avoid manual repetition?

btalamini and others added 30 commits July 19, 2024 21:57
…r internal heat source

Using a material doesn't work, because the source term contribution
is meant to be the heat capacity, and hence gets multiplied by the
temperature rate in the residual. With a custom integral, we can
hopefully plug the internal heat source into the appropriate slot
in functional and get the right result.
…om:LLNL/serac into bugfix/talamini/thermomechanics_with_state
I moved the update of the plastic work before the plasticity
solve. This makes the logic of the model simpler.
Temeprature change test with thermoelastic Green-St Venant material.
Dummy material with constant heat source.
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