Second order splitting of a class of fourth order PDEs with point constraints

Elliott, Charles; Herbert, Philip

doi:10.1090/mcom/3556

Second order splitting of a class of fourth order PDEs with point constraints
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by Charles M. Elliott and Philip J. Herbert HTML | PDF

Math. Comp. 89 (2020), 2613-2648 Request permission

Abstract:

We formulate a well-posedness and approximation theory for a class of generalised saddle point problems with a specific form of constraints. In this way we develop an approach to a class of fourth order elliptic partial differential equations with point constraints using the idea of splitting into coupled second order equations. An approach is formulated using a penalty method to impose the constraints. Our main motivation is to treat certain fourth order equations involving the biharmonic operator and point Dirichlet constraints for example arising in the modelling of biomembranes on curved and flat surfaces but the approach may be applied more generally. The theory for well-posedness and approximation is presented in an abstract setting. Several examples are described together with some numerical experiments.

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