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A Geometry-aware Data Partitioning Algorithm for Parallel Quad Mesh Generation on Large-scale 2D Regions

Yu, Wuyi, Xin Li

24th International Meshing Roundtable, Elsevier Ltd., October 12-14 2015

IMR
PROCEEDINGS

24th International Meshing Roundtable
Austin, TX
October 12-14,2014

School of Electrical Engineering and Computer Science, Louisiana State University
Email: xinli@lsu.edu

Abstract
We develop a partitioning algorithm to decompose complex 2D data into small simple subregions for effective parallel quad meshing. We formulate the partitioning problem for effective parallel quad meshing as a quadratic integer optimization problem with linear constraints. Directly solving this problem is expensive for large-scale data partitioning. Hence, we suggest a more efficient two-step algorithm to obtain an approximate solution. First, we partition the region into a set of cells using L-infinity Centroidal Voronoi Tessellation (CVT), then we solve a graph partitioning on the dual graph of this CVT to minimize the total partitioning boundary length, while enforcing the load balancing and each subregion's connectivity. With this decomposition, subregions are distributed to multiple processors for parallel quadrilateral mesh generation. We demonstrate that our decomposition algorithm outperforms existing approaches by offering a higher-quality partitioning, and therefore, improved performance and quality in mesh generation.

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