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[ICEM] meshing-incomplete mesh in part after moving blocks to separate domains

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Old   November 23, 2015, 21:40
Default meshing-incomplete mesh in part after moving blocks to separate domains
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Faizan
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Hi all,

I am trying to move blocks and relevant mesh to respective parts. But I have a problem that I am unable to generate a complete mesh for any of the part. For example, when I moved the nozzle blocks to nozzle part and create the mesh elements, it appeared to be like the image attached. I was unable to generate the complete mesh shape of nozzle, even though the blocks are present.


When I moved the block of HPGAS and created the mesh elements. It was incomplete

And for AIR geometry, a portion of nozzle was absent as per attached image.

Would anybody suggest as where am I making mistake? Am I selecting the wrong blocks or is any mistake in associated of edges? As per my understanding if I separate the blocks and generate the mesh, then mesh should have a complete shape of the geometry. Is it because of coarse mesh?

Please suggest. Your guidance will be much appreciated.

Regards,

Faizan
Attached Images
File Type: jpg Nozzle mesh.JPG (50.8 KB, 16 views)
File Type: jpg HPGas.JPG (38.5 KB, 13 views)
File Type: jpg Air.jpg (139.3 KB, 13 views)
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Old   November 25, 2015, 05:24
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Gwenael H.
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Hi Faizan,

This looks like an association problem to me. It is recommended not to mix geometry and blocking elements within the same part, so you should create a specific part for your nozzle blocking.

Depending on how you associate your vertices/edges/faces, sometimes when you "move" the blocks to a new part the associations can go wrong. The first thing to do is to check the associations, you can update them under Blocking tab > Associate > Update Association (6th icon) > check Vertices, Edges, Faces > Apply

If it didn't fix your problem you need to re-associate your edges/faces and recompute the premesh.

Have a nice day
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Old   November 25, 2015, 22:08
Default Mesh-Lines problems
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Hi Gweher,

Many thanks for your response. I have managed to separate block in one part, then I created a separate topology for desired part and generated the mesh. It works fine with me as long as mesh export is concerned.

But I have another problem just aroused that when I brought the mesh in CFX-Post and sliced all domains from center to visualize the connectivity of nodes and mesh lines. I found some abnormal mesh lines and corrupted nodes. I am unable to understand why is had happened because before mesh export from ICEM I checked the mesh QUALITY and it was excellent.

I am attaching the pics. Please suggest.

Thanks in advance.
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File Type: jpg Mesh lines probelm.jpg (172.8 KB, 9 views)
File Type: jpg Mesh lines probelm_2.jpg (194.3 KB, 8 views)
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Old   November 26, 2015, 03:45
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Hi Faizan,

Happy that it solved your problem. Regarding the export can you describe your procedure ?
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Old   November 26, 2015, 04:24
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Hi Gweher,

In ICEM, I converted the mesh to unstructured. Then in Output menu I chose ANSYS CFX solver and wrote the input file for CFX mesh exported with extension .cfx5.

Pl. suggest.

Faizan
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Old   November 26, 2015, 05:29
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That's correct, I would add the boundary conditions before exporting. Do you mind sharing your .tin and .blk files ?
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Last edited by Gweher; November 30, 2015 at 09:19.
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Old   November 26, 2015, 21:08
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Hi Gweher,

Thanks for your response. Actually I am always confused about the boundary conditions. In fact I wish to ask you about it like as where and which software should I put those boundary conditions. I mean should I put boundary conditions in ICEM? or Should I declare boundary conditions in ANSYS CFX-Pre? which method is suotable and preferable. As you know in CFX-Pre, you can choose boundar conditions by selecting correct faces of your mesh regions. Please suggest.

I tried attaching .tin and .blk files but it is giving me security error. Pl. suggest your email id so that I can forward you my project files.

Thanks in advance,

Faizan
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Old   November 27, 2015, 09:46
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Hi Faizan,

It's easier to assign the boundary conditions within ICEM. Even if you want to change their type in CFX-Pre.

For the .tin and .blk I've send you a private message.
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Old   November 29, 2015, 22:11
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Thanks Gweher- I have sent you the files on email you provided.

Look forward to hear from you,

Faizan
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