Adjustments to ExtendableFEMBase 1.0 and new example on coupled Stokes-Darcy #49
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chmerdon
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pjaap
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Apr 10, 2025
…iginal equation This enables us to use initial values for itearative solvers
…ecks the errors for some default values
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Operators are adjusted to ExtendableFEMBase 1.0 (use new xgrid argument in FEBasisEvaluator constructors).
The new example solves the coupled Stokes-Darcy problem in a monolithic fashion having one cell regions for the Stokes equation and one region for the Darcy equation and both are coupled via interface conditions. One of them is realised via a Lagrange multiplier. Each cellregion and the interface region hosts finite element spaces that live on sub-entities of the full mesh. An analytic benchmark problem is solved to confirm convergence rates.