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Consistent dirichlet boundary conditions for numerical\ud solution of moving boundary problems

By M.E. Hubbard, M.J. Baines and P.K. Jimack


We consider the imposition of Dirichlet boundary conditions in the finite element mod-elling of moving boundary problems in one and two dimensions for which the total mass is prescribed. A modification of the standard linear finite element test space allows the boundary conditions to be imposed strongly whilst simultaneously conserving a discrete mass. The validity of the technique is assessed for a specific moving mesh finite element method,\ud although the approach is more general. Numerical comparisons are carried out for mass-conserving solutions of the porous medium equation with Dirichlet boundary conditions and for a moving boundary problem with a source term and time-varying mass

Publisher: Elsevier
Year: 2009
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