Ansys Meshing – Parallel Meshing

Written by cfd.ninja

March 13, 2020

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Source: Ansys

You can control three mechanisms in ANSYS Workbench that operate in a parallelized manner:

  • Remote Solve Manager Design Point updates. Refer to RSM Configuration.

  • Parallel Part meshing: Tools> Options> Number of CPUs for Parallel Part Meshing

  • Individual mesh methods (MultiZone Quad/Tri, Patch Independent Tetra, and MultiZone only): Tools> Options> Number of CPUs for Meshing Methods

For the most efficient use of machine resources, it is important that the running processes do not over-saturate the processing cores or the available memory. You must allocate processing cores to each of these mechanisms in a way that provides the most benefit for your workflow. When parallel part meshing is invoked with the default number of CPUs, it automatically uses the cores of all available CPUs with the inherent limitation of 2 gigabytes per CPU core.

Parallel Part Meshing Best Practices

Best practices include:

  • Know how many physical processing cores are available.

  • If you are using Remote Solve Manager (RSM), meshing is done serially. This option cannot be overridden.

  • For non-RSM Design Point updates, meshing is done serially by default. You can override this option by setting the option Number of CPUs for Parallel Part Meshing explicitly under Meshing>Advanced Options.

  • If you are using more than one processor for individual meshing methods, be sure to set a balance between the two meshing options if you are using methods that support the Number of CPUs for Meshing Methods option (MultiZone Quad/Tri, Patch Independent Tetra, and MultiZone).  They should be set to an explicit value greater than 0.

    For example, if you are using an 8 core system, setting Number of CPUs for Parallel Part Meshing to 3 and Number of CPUs for Mesh Methods to 3 will provide a good balance. If the mesh methods that you typically use support the Number of CPUs for Meshing Methods option, setting the Number of CPUs for Parallel Part Meshing to 2 and the Number of CPUs for Meshing Methods to 4 or 5 may potentially provide more benefit.

  • If you are using parallel part meshing only, you can set the Number of CPUs for Parallel Part Meshing to 0.  In such cases, the software uses as many cores as possible.

  • For Parallel Part meshing we recommend turning off hyper-threading as this may lead to degradation of parallel performance.

  • Note that Parallel Part meshing does not support the following mesh controls:

    • Assembly meshing

    • Contact Sizing

    • Fracture

    • Mesh Match via Symmetry

    • Morph Service/Morphing

    • Pinch

    • Post Connection

    • Post-Inflation

    • Preview Surface Mesh/Preview Inflation

    • Retry

    • Refinement

In this tutorial, you will learn how to do a parallel mesh using Ansys Meshing. In this video we show the configuration to customize the number of cores of your processor.

 

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