[WIP] add python script for prefactor scaling

[naliboff]

A python script to correctly convert viscous flow prefactor terms from experimental studies such that they are internally consistent with ASPECT's rheological conventions and assumptions.

@bobmyhill @jdannberg @anne-glerum @cedrict - Is this worth adding in, and if yes does the current structure make sense?

FYI, I am going to add a more detailed description of how the scaling works in #5576, but can also do that here as well. For now, I cited the grain size paper, which provides a description of the conventions in an Appendix.

For all pull requests:

• I have followed the instructions for indenting my code.

For new features/models or changes of existing features:

• I have tested my new feature locally to ensure it is correct.
• I have created a testcase for the new feature/benchmark in the tests/ directory.
• I have added a changelog entry in the doc/modules/changes directory that will inform other users of my change.

[bobmyhill]

Hi @naliboff, I think this would be really useful. Would you be willing to make this into a function that people can easily use to scale their own flow law parameters?

[naliboff]

Hi @naliboff, I think this would be really useful. Would you be willing to make this into a function that people can easily use to scale their own flow law parameters?

Sure thing, I'll organize this into some type of function for the part that can be generalized. Suggestions for how to handle the unit conversion portions? That is a bit unique to each reported study. Should I keep the current structure as is?

[bobmyhill]

Would unum be of any use for unit conversions? https://github.com/trzemecki/Unum