Abstract
We present a parallel mesh generator called PMSH that is developed as a wrapper code around the open source sequential Netgen mesh generator. Parallelization of the mesh generator is carried out in five stages: (i) generation of a coarse volume mesh; (ii) partitioning of the coarse mesh; (iii) refinement of coarse surface mesh to produce fine surface submeshes; (iv) remeshing of each fine surface submesh to get a final fine mesh; (v) matching of partition boundary vertices followed by global vertex numbering. A new integer based barycentric coordinate method is developed for matching distributed partition boundary vertices. This method does not have precision related problems of floating point coordinate based vertex matching. Test results obtained on an SGI Altix ICE X system with 8192 cores confirm that our approach does indeed enable us to generate multibillion element meshes in a scalable way.
Highlights
We developed a tool called PMSH for facilitating fast generation of unstructured multibillion element tetrahedral meshes on complex geometries for the OpenFOAM computational fluid dynamics (CFD) package [1]
The snappyHexMesh utility works more like a mesh sculptor rather than a generator. It takes an existing mesh such as the one produced by blockMesh and chisels out a mesh on a complex geometry that is given in Standard Template Library (STL) format
We have developed a wrapper tool called PMSH around the existing sequential Netgen mesh generator that enabled us to generate multibillion element tetrahedral meshes for the OpenFOAM applications
Summary
We developed a tool called PMSH for facilitating fast generation of unstructured multibillion element tetrahedral meshes (grids) on complex geometries for the OpenFOAM computational fluid dynamics (CFD) package [1]. The snappyHexMesh utility works more like a mesh sculptor rather than a generator It takes an existing mesh such as the one produced by blockMesh and chisels out a mesh on a complex geometry that is given in STL format. The snappyHexMesh utility has advanced features like the ability to run in parallel and being able to redistribute the mesh so as to perform automatic load balancing. Both utilities, snappyHexMesh and blockMesh, are not as advanced as other commercial or open source mesh generator packages for producing quality tetrahedral meshes on complex geometries.
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