Is it possible to initialize a transient simulation in Acusolve from CGNS file?

Mahdi_22303
Mahdi_22303 Altair Community Member
edited September 2023 in Community Q&A

Hi,

I would like to import mesh, and data from Fluent to Acusolve, and conitnue simulation inside Acusolve. I could not import a .cas file, but I could import the mesh file to Acusolve. Is it possible to import the data from Fluent and interpolate it on the imported mesh and continue a transient run in Acusolve?

 

Thank you,

Mahdi.

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Best Answer

  • acupro
    acupro
    Altair Employee
    edited August 2023 Answer ✓

    While I wouldn't necessarily recommend it - as a setup/mesh for Fluent isn't always a good setup/mesh for AcuSolve - you may be able to map as Initial Conditions in SimLab if you can get the mesh there also.  But it wouldn't handle CGNS.  It would need text files - x y z pressure, x y z temperature, x y z x-vel y-vel z-vel, etc.  Maybe you can export those from Fluent.

     

     

Answers

  • acupro
    acupro
    Altair Employee
    edited August 2023 Answer ✓

    While I wouldn't necessarily recommend it - as a setup/mesh for Fluent isn't always a good setup/mesh for AcuSolve - you may be able to map as Initial Conditions in SimLab if you can get the mesh there also.  But it wouldn't handle CGNS.  It would need text files - x y z pressure, x y z temperature, x y z x-vel y-vel z-vel, etc.  Maybe you can export those from Fluent.

     

     

  • Mahdi_22303
    Mahdi_22303 Altair Community Member
    edited July 2023
    acupro_21778 said:

    While I wouldn't necessarily recommend it - as a setup/mesh for Fluent isn't always a good setup/mesh for AcuSolve - you may be able to map as Initial Conditions in SimLab if you can get the mesh there also.  But it wouldn't handle CGNS.  It would need text files - x y z pressure, x y z temperature, x y z x-vel y-vel z-vel, etc.  Maybe you can export those from Fluent.

     

     

    Thank you very much acupro for your reply. The reason that I need to bring the data is because it is an unsteady flow and it is time consuming to start it over, but I will try the solution from Acusolve too to see how they compare. 

    Thank you,

    Mahdi.

     

  • ydigit
    ydigit
    Altair Employee
    edited August 2023

    It seems that CGNS cannot be read into SimLab. So as suggested above if you can get CSV format data, it can be read/mapped in SL. 

    A long shot might be converting CGNS to OpenFOAM to VTK. The VTK could be read by SL. 

    [CGNS] CGNS converters available -- CFD Online Discussion Forums (cfd-online.com)

     

  • Mahdi_22303
    Mahdi_22303 Altair Community Member
    edited August 2023
    ydigit_21275 said:

    It seems that CGNS cannot be read into SimLab. So as suggested above if you can get CSV format data, it can be read/mapped in SL. 

    A long shot might be converting CGNS to OpenFOAM to VTK. The VTK could be read by SL. 

    [CGNS] CGNS converters available -- CFD Online Discussion Forums (cfd-online.com)

     

    Thank you for your comment ydigit. One problem that I have with imprting the mesh and data from Fluent is that when I import the mesh in CGNS format to hyperwork CFD, and then I want to assign periodic boundary condition to two parallel surfaces, it says, "cannot use periodic for FE geometry" Is this something that can be solved? Because I have created hex mesh for my geometry, I want to preserve the element structure in hyperwork as I am not familiar with making mesh in Hypermesh. 

     

    Thank you,

    Mahdi. 

  • acupro
    acupro
    Altair Employee
    edited August 2023
    Mahdi_22303 said:

    Thank you for your comment ydigit. One problem that I have with imprting the mesh and data from Fluent is that when I import the mesh in CGNS format to hyperwork CFD, and then I want to assign periodic boundary condition to two parallel surfaces, it says, "cannot use periodic for FE geometry" Is this something that can be solved? Because I have created hex mesh for my geometry, I want to preserve the element structure in hyperwork as I am not familiar with making mesh in Hypermesh. 

     

    Thank you,

    Mahdi. 

    I would suggest at this point it's probably more efficient to do everything in SimLab or HyperWorks CFD and not use the Fluent mesh/results.  There really is no benefit to using hex mesh with Altair CFD (AcuSolve).

    General tutorials for SimLab:
    https://web.altair.com/altair-for-simlab-learning-center-trls

    General tutorials - covering SimLab and HyperWorks CFD:
    https://help.altair.com/hwcfdsolvers/acusolve/topics/chapter_heads/tutorials_r.htm

  • Dustin Weaver
    Dustin Weaver Altair Community Member
    edited September 2023

    Hi,

    I'm currently trying to import a Fluent Mesh into AcuSolve GUI. Is this possible? When I open the Fluid mesh in the GUI all I see is a surface mesh. Is it really a volume mesh? I also tried to use acuImport to convert the mesh that way but was unable to import the produced mesh into the GUI.

  • acupro
    acupro
    Altair Employee
    edited September 2023
    Dustin Weaver said:

    Hi,

    I'm currently trying to import a Fluent Mesh into AcuSolve GUI. Is this possible? When I open the Fluid mesh in the GUI all I see is a surface mesh. Is it really a volume mesh? I also tried to use acuImport to convert the mesh that way but was unable to import the produced mesh into the GUI.

    Assuming you're meaning HyperWorks CFD here.  Have you tried creating a section cut (in the set of tools at the bottom of the display window) to see the interior?  Also if you hover over the Measure tool in the main icon set at the top, at the lower right of that you can click on the little 'table' icon to get information.  That will give you 2D and 3D element counts.

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