2D-meshing in cfd

[oliveroxtoby]

gmsh: works fine
cfmesh: meshing error at front-window
snappyhexmesh: gives allways a 3D-mesh (?)

Should be fixed.

[julieng]

Hello,

After compute a 3D case, in which I have boundary layers sub mesh regions, I have only access after Extract Block command to "multiblock datatest and internal mesh". I cannot choose the boundaries of interest like in the tutorial you show me.
What should I do in FreeCAD to have access to the boundaries groups in Paraview ?

Best regards

Julien

[julieng]

I do slightly differently, I don't know why:
I can have access to the boundaries directly in the first node of Paraview Openfoam reader.
After I do the same operation than in the tutorial and finally I integrate over the surface of interest the lift and drag forces, but I think that I have to multiply the pressure calculated by Openfoam by the volumic mass of my fluid [kg/m^3] ? Right?

Best regards

Julien

[thschrader]

... but I think that I have to multiply the pressure calculated by Openfoam by the volumic mass of my fluid [kg/m^3] ? Right?

Right. See unit-definition in p dict after writing the case.

[julieng]

Hello,

I have a geometry that can be solved in 2D.

I try the 2Dboudingplane condition (try to assign the 2 planes in the same node or 2 nodes with 1 plane in each) but it doesn't work for the 3 meshers.



Is this option is still supported ?

Julien

[thschrader]

assign each face as a separate BC.

naca2412.FCStd

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[julieng]

Yes I have already done this

[oliveroxtoby]

Yes I have already done this

Please upload your case, otherwise it's pure guesswork.

[julieng]

The file is attached.

With the native geometry drawn with partdesign, I have several errors telling that I have to add 2Dbounding BC.

I have exported the geometry in step file and import it. I am able to run the snappyHexMesh in 2D but the result is completly wrong.

Someone can try to mesh this case in 2D please?

[oliveroxtoby]

The file is attached.

With the native geometry drawn with partdesign, I have several errors telling that I have to add 2Dbounding BC.

I have exported the geometry in step file and import it. I am able to run the snappyHexMesh in 2D but the result is completly wrong.

Someone can try to mesh this case in 2D please?

Works for me with all three meshers if I use a base element size of 4mm. If you made the slab thicker, you could use a larger element size.