[snappyHexMesh] Snappy failing at morph iteration

plucas · May 27, 2013, 18:49

I am using openfoam 2.2.0 using Ubuntu 11.10. I just upgraded to 2.2.0 from the last release of openfoam. The case I am working on is similar to one I did on the last openfoam release.

I have meshed around with the snappyhexmesh file for the last week and searching has left me without answers.

This case is an external aerodynamic study with a car. I have attached the snappyhexmesh log file and the snappyhexmeshdict file. Any help on this would be greatly accepted.

If any other files would help, I can upload those also. Thanks in advance for the help!

Haces · May 29, 2013, 17:16

Hi plucas,
If you want to use the explicitFeatureSnap I think you have to add the features before.

plucas · May 29, 2013, 21:47

What do you mean add before?

Haces · May 30, 2013, 04:25

I think that for the explicit features you need the edges. You import this edges in snappyHexMesh in a eMesh archive inside features. You have this part commented

plucas · May 30, 2013, 09:03

Ok, I will try to get the eMesh to work. I was running into problems with that also which is why it is commented out.

Do I have to call out the patches in surfaceFeatureExtract? Right now I just have the stl file called out in the surfaceFeatureExtract.

Haces · May 30, 2013, 11:17

You don't need to call the patches. The command surfaceFeatureExtract extracts the edges of the stl surfaces. To see the result you can create a .obj file and open it with paraview. To filter the edges you can for example eider use includedAngle or minElem. If you have OF 2.1 you can write surfaceFeatureExtract -help to see the different options. In OF 2.2 I don't know how to see the different options because surfaceFeatureExtract is a dictionary. Probably you can search it in the tutorials.

plucas · May 30, 2013, 11:56

Ok I will try this when I get home. Thanks for the help! And I will inform you how it goes.

plucas · May 30, 2013, 23:09

I tried the surfaceFeatureExtract and it failed. Maybe I should make a new thread on this... I have attached the files. I am completely lost of the problem after upgrading to the new release.

Haces · May 31, 2013, 04:03

Have you checked the quality of the surface?I think that the command is surfacecheck. maybe your problems come from this.
You can also try to use the implicit feature instead the explicit one. If you don't get an error you know were is the problem. But I'm still recommending the explicit method.

plucas · May 31, 2013, 06:15

I have tried implicit instead of explicit with no luck also. I have not checked the surface, but I will be trying that. That has to be the issue....

Owais Shabbir · August 8, 2019, 15:52

Hi,

I hope you have already found your solution if yes please share.

For the sake of thread, I think the problem is generated due to the refinement box you have introduced.

BR,
OS

May 30, 2013, 04:25		#4
Haces New Member David Haces Join Date: Mar 2013 Posts: 28 Rep Power: 13	I think that for the explicit features you need the edges. You import this edges in snappyHexMesh in a eMesh archive inside features. You have this part commented Metternich likes this.

August 8, 2019, 15:52	Possible error	#11
Owais Shabbir Member Owais Shabbir Join Date: May 2019 Posts: 48 Rep Power: 6	Hi, I hope you have already found your solution if yes please share. For the sake of thread, I think the problem is generated due to the refinement box you have introduced. BR, OS

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May 29, 2013, 17:16		#2
Haces New Member David Haces Join Date: Mar 2013 Posts: 28 Rep Power: 13	Hi plucas, If you want to use the explicitFeatureSnap I think you have to add the features before.

May 29, 2013, 21:47		#3
plucas Senior Member Anonymous Join Date: Dec 2011 Location: USA Posts: 108 Rep Power: 14	What do you mean add before?

May 30, 2013, 09:03		#5
plucas Senior Member Anonymous Join Date: Dec 2011 Location: USA Posts: 108 Rep Power: 14	Ok, I will try to get the eMesh to work. I was running into problems with that also which is why it is commented out. Do I have to call out the patches in surfaceFeatureExtract? Right now I just have the stl file called out in the surfaceFeatureExtract.

May 30, 2013, 11:17		#6
Haces New Member David Haces Join Date: Mar 2013 Posts: 28 Rep Power: 13	You don't need to call the patches. The command surfaceFeatureExtract extracts the edges of the stl surfaces. To see the result you can create a .obj file and open it with paraview. To filter the edges you can for example eider use includedAngle or minElem. If you have OF 2.1 you can write surfaceFeatureExtract -help to see the different options. In OF 2.2 I don't know how to see the different options because surfaceFeatureExtract is a dictionary. Probably you can search it in the tutorials.

May 30, 2013, 11:56		#7
plucas Senior Member Anonymous Join Date: Dec 2011 Location: USA Posts: 108 Rep Power: 14	Ok I will try this when I get home. Thanks for the help! And I will inform you how it goes.

May 31, 2013, 04:03		#9
Haces New Member David Haces Join Date: Mar 2013 Posts: 28 Rep Power: 13	Have you checked the quality of the surface?I think that the command is surfacecheck. maybe your problems come from this. You can also try to use the implicit feature instead the explicit one. If you don't get an error you know were is the problem. But I'm still recommending the explicit method.

May 31, 2013, 06:15		#10
plucas Senior Member Anonymous Join Date: Dec 2011 Location: USA Posts: 108 Rep Power: 14	I have tried implicit instead of explicit with no luck also. I have not checked the surface, but I will be trying that. That has to be the issue....