An extended finite element method for a diffuse-interface model

• Autores: Jang Min Park, Martien Hulsen, Patrick D. Anderson
• Localización: Journal of computational and applied mathematics, ISSN 0377-0427, Vol. 272, Nº 1, 2014, págs. 25-40
• Idioma: inglés
• DOI: 10.1016/j.cam.2014.04.025
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• Resumen

  • This work presents an extended finite element method (XFEM) for a diffuse-interface model, which describes interfacial phenomena of multi-phase flow. The diffuse interface has a non-zero thickness over which the phase field variable changes continuously. The diffuse-interface thickness is typically very small compared to the observed domain size, resulting in a high-gradient solution. In this work, the finite element approximation of the phase field variable is locally enriched with a tangent hyperbolic function which characterizes a high-gradient solution of the diffuse-interface model. We study a one-dimensional advection and two diffusion problems, and demonstrate the remarkable improvement of the solution by the local enrichment.