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Sharp edges not being refined properly

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Old   September 10, 2013, 14:16
Default Sharp edges not being refined properly
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Eli Baldwin
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Hello,

I'm new to snappyHexMesh and I've read through the snappy user guide as well as all relevant cfd-online posts. I am trying to make a mesh for a two nozzle impinging spray. The mesh will include one of the nozzles and a symmetric boundary on the plane where the jets collide. There is a second symmetric plane through the nozzle to minimize cell count. For now I am working with a single refinement cylinder of level 4 around the nozzle.

I am using explicit edge / feature snapping with surfaceFeatureExtract. The two primary problems that I am observing are,
1. Rounding of some sharp edges
2. Disruption of the symmetric plane

Attached are some screenshots of the current mesh snappyHexMesh is generating. There is a refinement cylinder with a refinement level of 4 around the nozzle. The snappyHexMeshDict is also attached. Any help is welcome!

Thanks,
Eli
Attached Images
File Type: jpg NozzlePic1.jpg (79.2 KB, 31 views)
File Type: jpg NozzlePic2.jpg (8.5 KB, 26 views)
File Type: jpg SymDisruption.jpg (47.5 KB, 23 views)
Attached Files
File Type: txt snappHexMeshDict.txt (11.1 KB, 8 views)

Last edited by ebaldwin; September 10, 2013 at 16:38.
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Old   September 11, 2013, 05:28
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Artur
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I must say that edge problem looks like nothing I've seen before. Have you tried previewing the extracted feature lines and checking that they are correct?

(use
Code:
surfaceFeatureConvert constant/triSurface/ImpingingJet0.eMesh ImpingingJet0.obj
and open the .obj file in paraview).
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Old   September 11, 2013, 09:59
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Eli Baldwin
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Yes, the extracted lines look to be right on.
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Old   September 11, 2013, 10:07
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Hmmm.. Any chance of you uploading your geometry then?
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