Abstract
The Dirichlet problems discussed in this paper arise when implicit time approximation methods are employed in perturbed two-phase Stefan problems. The discontinuity in the enthalpy h across the free boundary interface of the two phases appears in the Dirichlet problems as a term $h(U)$, where h is discontinuous at 0. Two major results are presented, viz., an existence theorem, making use of pseudomonotone operators, and an approximation theorem, utilizing solutions $U_\varepsilon $ of appropriately smoothed Dirichlet problems corresponding to smoothings $h_\varepsilon $ of h. In the special case of homogeneous boundary conditions, an alternative approach, making use of results of Brezis–Strauss together with “a priori” estimates and Leray–Schauder degree theory, gives existence of solutions.
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