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[ICEM] Geometry Repair to Delanuay Meshing of a Nacelle Body in a Duct

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Old   May 26, 2015, 14:08
Default Geometry Repair to Delanuay Meshing of a Nacelle Body in a Duct
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Maverick Zawislak
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Hello fellow ICEM users,

My geometry is a nacelle shaped body supported my a strut inside of a square duct. It was created in CAD and exported to ICEM 15.0 as a STEP file. I then repaired the geometry using build topology by filtering curves, creating single curves and used a 0.01mm tolerance. The result showing color by count is Image1.

I then specified surface and edge meshing parameters and computed an Octree volume mesh. I needed to use visible geometry and not all geometry to mesh. Meshing with all geometry I was told I needed ~17M cells for some reason when the final mesh was ~3M?

I then deleted the volume mesh in order to smooth the surface mesh for eventual Delanuay and prism layer creation similar to this process from Simon *PYSMN: http://www.cfd-online.com/Forums/ans...mesh-icem.html

Problem 1: When I zoom in to the rounded trialing edge and external body part the mesh is not respecting the defining curve. The created mesh also has many added faces and missing internal faces along the curves that connect the body parts. See Image2.

Problem 2: The Delanuay mesh I compute using the smoothed surface mesh (from existing mesh option) gives a completely garbage result even though it runs to completion, see Image 3.

I apologize for the monster post but I wanted to provide enough info to start a conversation. I've been stuck on this for sometime now. Does anyone notice anything I've done wrong and need to change? More info required?

Thank you for your time,

Maverick
Attached Images
File Type: jpg Image1.jpg (40.4 KB, 32 views)
File Type: jpg Image2.jpg (99.3 KB, 29 views)
File Type: jpg Image3.jpg (79.1 KB, 30 views)
File Type: jpg OctreeMesh-cutplane.jpg (97.6 KB, 31 views)
File Type: jpg AddedFaces-TE.jpg (18.2 KB, 21 views)
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Old   June 3, 2015, 10:19
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Farhan Ahmed Manegar
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Hello Maverick,

I have faced similar problems in the past.. I solved problem 1 by defining a curve mesh parameter. But I see from your post that you have already defined them. And for problem 2, I am not sure, but I tried to keep a closed geometry and I got rid of problem 2. Anyways, if you can send me your ICEM geometry (.tin) file, I will have a look on why the problem occurs.

Farhan
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Old   June 3, 2015, 11:44
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Maverick Zawislak
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Hello Farhan,

I'm unable to attach the .tin file directly on the forum (invalid file error). Email me at 9msz@queensu.ca and I will send you the .tin that way you don't have to share your email publicly.

Having spent more time on the project I've discovered that generating a patch dependent surface mesh, saving the mesh then re opening just the mesh without the geometry. I was able to create a Delaunay volume but without the geometry I lose control over the prism layer step. So clearly my geometry is the issue for both the Octree mesh expecting to create far too many cells and the Delaunay mesh exploding out of my geometry.

I've added a few more pictures:
1) patch dependent surface mesh (after smoothing) created from the geometry file I've attached.
2) reasonable Delaunay mesh generated without the geometry and just the surface mesh (side view 20deg AoA)


Thank you for your interest,

Maverick
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File Type: jpg SurfaceMeshSmoothed_20AoA.jpg (96.5 KB, 25 views)
File Type: jpg DelaunaySide_20AoA.jpg (93.6 KB, 28 views)
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Old   June 4, 2015, 07:48
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Farhan Ahmed Manegar
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Hello Maverick,

I have emailed you.

Regards,

Farhan
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