Meshing a for CFD Simulation in an air-filled cross-section

Rahul_P1
Rahul_P1
Altair Employee
edited October 2020 in Community Q&A

Hi everyone! icon_smile.gif

I need your help! I designed a CAD model in ProE 5.0 (.asm): It's like a cuboid with an air-filled cross-section. The CAD model is build with 6 assembled plates (.prt). 2 side, 1 back, 1 front, 1 top and 1 bottom plate. Each plate has got 8 mm thickness. The attached image shows you the half 3D-model as a lateral cut.

For a following CFD simulation with AcuSolve I imported the .asm-model-file as geometry into HyperMesh (CFD). Just because the import into AcuConsole failed.
My focus is on the air-filled cross-section inside the 3D-Model. This is what I want to mesh! And define the surfaces as 'walls'.

I tried 2 ways to realize:

1) I did a 2D mesh of the surfaces and afterwards I tried to do a 3D cfd tetramesh. The problem is, HyperMesh doesn't want to mesh the cross-section...he only meshes the Solid between the surfaces of each plate.

2) I defined the plates as solid and HyperMesh meshed them as solid. But afterwards it's impossible to do a 3D cfd tetramesh for the air-filled inside...

Is the .asm-file with 6 parts (.prt) the problem or is there any other possibility to define the air-filled cross-section? Just to pick the inner surfaces is impossible because you'll get some free-edges icon_sad.gif ...

Thank You for your advice!!!
k42xy-CAD_model.jpg

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Answers

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    In method 1 what is the error you get? does it say the mesh is not enclosed?

    You need to make sure the air filled section is enclosed on all sides by a surface mesh, it should not have any gaps or free edges. You can make sure it is fully enclosed by equivalencing the surfaces or toggling the edges from the quick edit panel.

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    Hi,

    thanks a lot for your quick answer!

    Method 1): After 2D Mesh there a still free edges (I checked them with 'Mesh - Check ... edges'), but I don't know where they are from. And I don't know how to eliminate them! I'm a absolute beginner with HyperMesh.

    The point ist, ProE 3D model (-asm-file) is build - as you see in the image - from very simple parts (.prt-files). And their assignment should be without any gaps, because the parts are connected via surfaces, which are located on each other without any space inbetween.

    What does you mean with 'by equivalencing the surfaces or toggling the edges from the quick edit panel'?

  • Rahul_P1
    Rahul_P1
    Altair Employee
    edited May 2015

    In the same panel i.e. from mesh > check > components > edges

    select the components and click on equivalence,

    Tools page--> edges panel--> select elms or comps--> click on 'find edges'.

    This will show if there is a break in node connectivity. The break in connectivity can be equivalenced in the same panel by: selecting elms--> preview equivalence--> equivalence the previewed nodes. Care should be taken while setting the tolerance value, as two components which are too close may get equivalenced.

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