Two-dimensional Delaunay-based anisotropic mesh adaptation |
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Authors: | Doug Pagnutti Carl Ollivier-Gooch |
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Affiliation: | (1) Advanced Numerical Simulation Laboratory, Department of Mechanical Engineering, The University of British Columbia, Vancouver, BC, V6T 1Z4, Cananda;; |
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Abstract: | Science and engineering applications often have anisotropic physics and therefore require anisotropic mesh adaptation. In
common with previous researchers on this topic, we use metrics to specify the desired mesh. Where previous approaches are
typically heuristic and sometimes require expensive optimization steps, our approach is an extension of isotropic Delaunay
meshing methods and requires only occasional, relatively inexpensive optimization operations. We use a discrete metric formulation,
with the metric defined at vertices. To map a local sub-mesh to the metric space, we compute metric lengths for edges, and
use those lengths to construct a triangulation in the metric space. Based on the metric edge lengths, we define a quality
measure in the metric space similar to the well-known shortest-edge to circumradius ratio for isotropic meshes. We extend
the common mesh swapping, Delaunay insertion, and vertex removal primitives for use in the metric space. We give examples
demonstrating our scheme’s ability to produce a mesh consistent with a discontinuous, anisotropic mesh metric and the use
of our scheme in solution adaptive refinement. |
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Keywords: | |
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