On the convergence of entropy consistent schemes for lubrication type equations in multiple space dimensions. (English) Zbl 1084.65093
Summary: We present nonnegativity-preserving finite element schemes for a general class of thin film equations in multiple space dimensions. The equations are fourth order degenerate parabolic, and may contain singular terms of second order which are to model van der Waals interactions. A subtle discretization of the arising nonlinearities allows us to prove discrete counterparts of the essential estimates found in the continuous setting. By use of the entropy estimate, strong convergence results for discrete solutions are obtained. In particular, the limit of discrete fluxes \(M_h(U_h)\nabla P_h\) will be identified with the flux \(\mathcal M(u)\nabla(W'(u)-\Delta u)\) in the continuous setting. As a by-product, first results on existence and positivity almost everywhere of solutions to equations with singular lower order terms can be established in the continuous setting.
MSC:
| 65M60 | Finite element, Rayleigh-Ritz and Galerkin methods for initial value and initial-boundary value problems involving PDEs |
| 35Q35 | PDEs in connection with fluid mechanics |
| 65M12 | Stability and convergence of numerical methods for initial value and initial-boundary value problems involving PDEs |
| 76A20 | Thin fluid films |
| 76D08 | Lubrication theory |
| 76M10 | Finite element methods applied to problems in fluid mechanics |
Keywords:
Lubrication approximation; fourth order degenerate parabolic equations; nonnegativity preserving; finite elementsReferences:
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