[snappyHexMesh] Sharp edges not being refined properly

ebaldwin · September 10, 2013, 15:16

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

Artur · September 11, 2013, 06:28

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).

ebaldwin · September 11, 2013, 10:59

Yes, the extracted lines look to be right on.

Artur · September 11, 2013, 11:07

Hmmm.. Any chance of you uploading your geometry then?

September 11, 2013, 06:28		#2
Artur Senior Member Artur Join Date: May 2013 Location: Southampton, UK Posts: 372 Rep Power: 20	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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September 11, 2013, 10:59		#3
ebaldwin New Member Eli Baldwin Join Date: Aug 2013 Posts: 9 Rep Power: 13	Yes, the extracted lines look to be right on.

September 11, 2013, 11:07		#4
Artur Senior Member Artur Join Date: May 2013 Location: Southampton, UK Posts: 372 Rep Power: 20	Hmmm.. Any chance of you uploading your geometry then?