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Allow use of SUPG for mixed function spaces #579

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@atb1995 atb1995 commented Nov 26, 2024

Currently SUPG does not work for mixed function spaces. Here I have allowed for the altering of multiple test functions.

Note that MixedFSWrapper is not used, as altering a single test function in the tuple of test functions for a MixedFunctionSpace was difficult to do.

There is scope in future to not use SUPG as a wrapper, but this is not addressed in this pull request.
moist_bf_theta_e_-1
moist_bf_theta_e_supg3_-1

@atb1995 atb1995 self-assigned this Nov 26, 2024
@atb1995 atb1995 linked an issue Nov 26, 2024 that may be closed by this pull request
self.wrapper.setup(field_name)
new_test = self.wrapper.test
self.residual = self.residual.label_map(
lambda t: t.get(prognostic) == field_name and t.has_label(transport),
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can we change this so that we are testing whether the label is not time_derivative? I think it's better if the time discretisation to not know what terms it contains

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If we apply it to the momentum eq, then it will try to replace the test function for all terms with u in, which will be problematic..

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SUPG for MixedFunction Spaces
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