Assessment of dynamic adaptive grids in Volume-Of-Fluid simulations of oblique drop impacts onto liquid films

• P. Brambilla ^[1] ; A. Guardone ^[1]
  1. [1] Polytechnic University of Milan

     Polytechnic University of Milan

     Milán, Italia

     
• Localización: Journal of computational and applied mathematics, ISSN 0377-0427, Vol. 281, Nº 1 (June 2015), 2015, págs. 277-283
• Idioma: inglés
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• Resumen

  • Grid spacing dependence in three-dimensional numerical simulations of non-normal drop impact onto thin liquid films is assessed for different impingement angles and grid refinement levels. To describe the liquid phase dynamics, the Navier–Stokes equations are coupled to a Volume-Of-Fluid (VOF) model. Numerical simulations are performed with a modified version software OpenFOAM over a structured grid of hexaedra. Grid adaptation is carried out using an edge subdivision technique which results in non-conformal meshes. Grid convergence is assessed by monitoring integral parameters describing the dynamics of the post-impact free-surface waves. Starting from an initial grid spacing between D/8D/8 and D/5D/5, with DD drop diameter, a refinement level of three is found to be sufficient to describe the diverse flow feature and to identify the splashing regime.