Spherical harmonic coupling in BallBasis

[Andrey Kononov]

Hi! 

I am trying to perturb helmholtz equation with ncc term dependent on theta angle (or on phi). But this error occurs: TypeError: bad operand type for abs(): 'NoneType'

So m = None?!

My motivation is to find eigenmodes in rotating stars, so I have read related discussions: 

https://groups.google.com/g/dedalus-users/c/DfpDUJ4Yk3w/m/I02MgDryAgAJ

https://groups.google.com/g/dedalus-users/c/L5Cwd492hfU/m/2m4pb6xPAAAJ

And as I understand, this sort of coupling is resolved in ShellBasis, and not in BallBasis? Or perhaps my basis for ncc is wrong? 

Any contribution would be very appreciated!! Including possible workarounds

[Keaton Burns]

Hi Andrey,

At this point, the shell supports NCCs that depend on radius and latitude, but not azimuth, and the ball only supports NCCs that depend on radius.

Best,

-Keaton

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