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Combined refinement criteria for anisotropic grid refinement in free-surface flow simulation. (English) Zbl 1391.76117

Summary: Anisotropic grid refinement is performed for the simulation of water flow with free-surface waves. For these flows, the refinement criterion must provide refinement at the water surface, to accurately resolve the conservation law which indicates the surface position, and below the surface to resolve the water flow. A combined criterion is presented, based on the free-surface position and on the Hessian of the pressure. Different forms of this criterion are presented, based on least-squares or Gaussian computation of the Hessian, in order to overcome irregularities in the computed pressure. The weighting of the two criteria for their combination is discussed; this weighting can be chosen independently of the Reynolds and Froude number of the flow. It is shown that the criterion creates suitable grids for two- and three-dimensional free-surface flows when starting from uniformly coarse original grids.

MSC:

76D05 Navier-Stokes equations for incompressible viscous fluids
65M50 Mesh generation, refinement, and adaptive methods for the numerical solution of initial value and initial-boundary value problems involving PDEs
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