[firedrake] galerkin coarse grid operators

[Heldman, Max]

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Hi,

I’m working on a multigrid code and I’m wondering if there’s any way to get Galerkin coarse grid operators. The context is that I’m writing a Newton-multigrid type method, so I’m linearizing my PDE around the current iterate using automatic differentiation and then building the levels. I saw a 2016 paper which uses the coarsen_form function to get the coarse grid form, but that doesn’t seem to work anymore (and I’m not sure exactly what it does).

Sincerely,

Max Heldman