Generalize constant transport coefficient model to be any prescribed form

[jcitrin]

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[demoncoder-crypto]

Is this issue open, i would love to contribute.

[jcitrin]

Thanks for offering! Yes, it is open. Some pointers:

1. The main thing is to change the constant.py RuntimeParams to pydantic input objects corresponding to time varying arrays. Also, chii, chie, and De should always be positive.

2. A new type which does this (including the validation) is being developed now: torax_pydantic.PositiveTimeVaryingArray , see Move validation of profile conditions to pydantic #817 .

3. Once this is done, then the transport model is no longer "constant" since the transport coefficients can change over time and radius, depending on the prescribed user inputs. Therefore the name of the model can change to "prescribed.py"

In general I'd wait a little bit until the new release when all the pydantic stuff will be in. There will be more clear examples to learn from. At the moment the config stuff is a a bit in flux.

[demoncoder-crypto]

I will Start on this issue as soon as tomorrow. Thanks @jcitrin