A regularized model for wetting/dewetting problems: positivity and asymptotic analysis. (English) Zbl 07828068
Summary: We consider a general regularized variational model for simulating wetting/dewetting phenomena arising from solids or fluids. The regularized model leads to the appearance of a precursor layer which covers the bare substrate, with the precursor height depending on the regularization parameter \(\varepsilon \). This model enjoys lots of advantages in analysis and simulations. With the help of the precursor layer, the spatial domain is naturally extended to a larger fixed one in the regularized model, which leads to both analytical and computational eases. There is no need to explicitly track the contact line motion, and difficulties arising from free boundary problems can be avoided. In addition, topological change events can be automatically captured. Under some mild and physically meaningful conditions, we show the positivity-preserving property of the minimizers of the regularized model. By using formal asymptotic analysis and \(\Gamma \)-limit analysis, we investigate the convergence relations between the regularized model and the classical sharp-interface model. Finally, numerical results are provided to validate our theoretical analysis, as well as the accuracy and efficiency of the regularized model.
MSC:
| 76T30 | Three or more component flows |
| 76M45 | Asymptotic methods, singular perturbations applied to problems in fluid mechanics |
| 76M30 | Variational methods applied to problems in fluid mechanics |
| 76A20 | Thin fluid films |
| 35Q35 | PDEs in connection with fluid mechanics |
Keywords:
gamma-limit; contact line; sharp-interface model; vapour-fluid film-solid system; interfacial energy functional; equilibrium problemReferences:
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