[snappyHexMesh] snappyHexMesh for "Ahmed body"

eddykendo · January 9, 2019, 00:49

Hi, Foamers

I am trying to generate the mesh for "Ahmed body" LES simulation.
However, as attached pictures, after I generated the mesh, the front and the rear slant parts of the ahmed body were crushed even though I adjusted several parameters in snappyHexMeshDict a lot of times.
I hope you can give me any comment to fix this problem.
Otherwise, if you have a snappyHexMesh file which can generate nicely the mesh for the ahmed body without that problem, and can share it with me, I will appreciate you.

Thank you.

Lorena2fdez · January 9, 2019, 05:32

If you want the edges of the surfaces (slant parts) are well meshed, you can try to differentiate each surface, with different names, in the geometry loaded in snappyHexMesh.

eddykendo · January 9, 2019, 06:31

Thank you for your comment.
However, unfortunately, I am not able to differentiate an original file for ahmed body, say, xx.stl
Do you have a stl file made by each separated part for ahmed body?

Lorena2fdez · January 9, 2019, 06:46

Sorry, I don't have any file for "Ahmed body".

simrego · January 9, 2019, 10:05

Quote:

Originally Posted by eddykendo

Hi, Foamers

I am trying to generate the mesh for "Ahmed body" LES simulation.
However, as attached pictures, after I generated the mesh, the front and the rear slant parts of the ahmed body were crushed even though I adjusted several parameters in snappyHexMeshDict a lot of times.
I hope you can give me any comment to fix this problem.
Otherwise, if you have a snappyHexMesh file which can generate nicely the mesh for the ahmed body without that problem, and can share it with me, I will appreciate you.

Thank you.

Hi!

Can you share your snappyHexMeshDict file?
Then it will be easier to help you.

eddykendo · January 13, 2019, 20:33

I have attached a snappyHexMeshDict file.
I will appreciate you if you can take a look at them.

Thank you.

schuyler · February 15, 2019, 15:26

What angle are you using when you extract the feature edges to create your eMesh file? If you lower it, you will extract more edges, which snappy will try to resolve.

Alternatively, you could try cfMesh. See this blog post:

https://curiosityfluids.com/2016/09/07/the-ahmed-body/

Cheers.

Farakay41 · March 22, 2021, 04:10

Quote:

Originally Posted by eddykendo

I have attached a snappyHexMeshDict file.
I will appreciate you if you can take a look at them.

Thank you.

Sorry for reviving the post. I would like to know how large your bounding box domain was. I would be happy if you can share the blockMesh Dict

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January 9, 2019, 05:32		#2
Lorena2fdez New Member Lorena Fernández Fernández Join Date: May 2016 Location: Spain Posts: 21 Rep Power: 9	If you want the edges of the surfaces (slant parts) are well meshed, you can try to differentiate each surface, with different names, in the geometry loaded in snappyHexMesh.

January 9, 2019, 06:31		#3
eddykendo Member DongHo Join Date: Jul 2013 Posts: 51 Rep Power: 12	Thank you for your comment. However, unfortunately, I am not able to differentiate an original file for ahmed body, say, xx.stl Do you have a stl file made by each separated part for ahmed body?

January 9, 2019, 06:46		#4
Lorena2fdez New Member Lorena Fernández Fernández Join Date: May 2016 Location: Spain Posts: 21 Rep Power: 9	Sorry, I don't have any file for "Ahmed body".

February 15, 2019, 15:26		#7
schuyler Member W. Schuyler Hinman Join Date: Apr 2013 Location: Calgary, Alberta, Canada Posts: 38 Rep Power: 13	What angle are you using when you extract the feature edges to create your eMesh file? If you lower it, you will extract more edges, which snappy will try to resolve. Alternatively, you could try cfMesh. See this blog post: https://curiosityfluids.com/2016/09/07/the-ahmed-body/ Cheers.