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Community Computational Fluid Dynamics Pointwise Grid Sensitivity Analysis on Pointwise

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Grid Sensitivity Analysis on Pointwise

Jmendez
Jmendez over 1 year ago

Dear #CFD community;


I want to do a grid sensitivity analysis in #pointwise, but I do not want to manually go connector by connector and increase / decrease each connector. I heard that there is a Glyph script that does all that. Is that available for that?

Is there any other way to use a factor to increase/reduce the mesh density globally, either at the block or domain level?

What is the most efficient alternative to run a grid sensitivity here on Pointwise so I can increase or reduce my mesh size by factors? Ideally, it should be done without messing up with the height of the first cell to keep y+ "constant" or fairly constant. #GCI

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  • Claudio M Pita
    0 Claudio M Pita over 1 year ago

    Hello, 

    Thank you very much for your question. 

    In Fidelity Pointwise, you can use the Automatic Surface Mesh (ASM) functionality to easily and efficiently create a surface grid. Note that this tool has a Refinement Factor option that you can use to create a grid family. 

    Once you have created the surface grid, I would recommend using the Automatic Volume Mesh tool to quickly create the volume grid (i.e., blocks).

    If you are somewhat unfamiliar with Fidelity Pointwise, I would recommend reviewing the following video tutorials:

    • Fidelity Pointwise -Basic Concepts: https://youtu.be/7ynTrsuG80I?si=UFZPNw2GSXWs-P-a
    • Fidelity Pointwise - ASM: https://youtu.be/VmAYwRbChMk?si=CdbkyTcbYyDt47B_
    • Fidelity Pointwise - AVM: https://youtu.be/EU1Cb2KeK-U?si=OhTc8ktIXXbRACyB

    If needed, I would also recommend checking the User Manual: 

    • Help, User Manual
    • Create, Automatic Surface Mesh
      • Here you will find detailed explanation of all the available options in ASM as well as images and short videos showing how to use each one of them.
    • In the User Manual, Create, Automatic Volume Mesh
      • Here you will find detailed explanation of all the available options in AVM as well as images and short videos showing how to use each one of them. 

    Note: The Pointwise files used in these tutorials are available in the Cadence Online Support (COS) platform. 

    I hope this helps!

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  • Jmendez
    0 Jmendez over 1 year ago in reply to Claudio M Pita

    Thanks, Claudio, for your help. What if I already have my surface and block ready? I already built my surface mesh, made some changes, and built my block, and I'm happy. However, I'd like to refine and coarsen that final mesh without going back to the beginning of the process.

    I tried that avenue but must delete my block and domains and start again from the ASM with different sizes; I do not want that avenue.

    Is there any other alternative?

    Thanks again, Claudio !!

    thanks

    JM

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  • Claudio M Pita
    +1 Claudio M Pita over 1 year ago in reply to Jmendez

    Hi Julio, 

    Thank you very much for the additional information. 

    In that case, I would recommend using the GridRefine script that we have available in GitHub: https://github.com/pointwise/GridRefine

    As always, please keep in mind that these scripts are intended to be a starting point and they are indeed unsupported. 

    Hope this helps!

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  • Jmendez
    0 Jmendez over 1 year ago in reply to Claudio M Pita

    Claudio that is what I was looking for ! Thanks !! I really appreciate your continuous support !!

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  • Jmendez
    0 Jmendez over 1 year ago in reply to Claudio M Pita

    Claudio that is what I was looking for ! Thanks !! I really appreciate your continuous support !!

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  • Claudio M Pita
    0 Claudio M Pita over 1 year ago in reply to Jmendez

    Hi Julio, 

    Awesome! Glad that we have a script that will offer a strong starting point for what you are looking to accomplish. 

    Thank you very much for being an excellent Fidelity Pointwise user over the years.

    Have a great weekend! 

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