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[snappyHexMesh] Coarse mesh

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Old   June 1, 2023, 10:55
Default Coarse mesh
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Hi there,

This is Julio. I am new to OpenFoam and CFD. I have a very basic question but I am having a hard time trying to fix it.
I have a very basic space I want to analyze the temperature and air speed variations within. I have inlet boundaries and some other interior features. The problem occurs when generating the main boundary of the space the shape is similar to a semicircle but I simplified it with straight lines. However, when I run the OpenFOAM meshing it generates a mesh with very coarse edges and this gives me very strange results.
I have marked in red how I think it should be to obtain more realistic results.
Does anybody know why is this happening? which parameters should I modify to obtain a straight mesh? which is the right settings so all the inlets work as they should? which is the right boundary type for a AC system, inlet boundary or inlet flow-rate boundary?

Thanks in advance.
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File Type: jpg Open Foam HVAC inlets Atrium.jpg (57.8 KB, 12 views)
File Type: jpg Refined edges.jpg (72.6 KB, 13 views)
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Old   June 19, 2023, 09:10
Vinzenz Götz
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Hello Julio,

please upload a picture of your mesh and post your sHMDict.

Why do you use straight lines and not just a semicircle?

Where are your inlets and where are your outlets?

What solver are you using?

What boundary conditions are you using right now?

Best regards,
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