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[ICEM] Prism layers distorted near trailing edge of blade-Unstructured Mesh

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Old   June 25, 2015, 17:24
Default Prism layers distorted near trailing edge of blade-Unstructured Mesh
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Rohith Giridhar
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Hi All,

I wish to create 20 prism layers with an initial height of 1e-5 around a blade. I have a 3D geometry that I am working with.
I tried to create 4 prism layers first and split each prism layers into 5 layers to obtain 20 layers and then I redistributed the same.
When I do this, the prism layers that I get after redistribution is distorted near the trailing edge of the blade and I am not sure how to correct this.
Could anybody please help me regarding this on how I should go about to correct the same.

I have attached below the pictures of the prism layers around the blade when I had created the 4 prism layers first and the distorted prism layers near the trailing edge of the blade.

Thank you!
Attached Images
File Type: png 4 Prism layers created.PNG (37.4 KB, 44 views)
File Type: png When Prsim layers are split.PNG (28.8 KB, 49 views)
File Type: png Prism layers after redistribution.PNG (39.0 KB, 41 views)
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Old   June 25, 2015, 17:47
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Rohith Giridhar
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Regarding mesh creation:
I created a patch dependent surface mesh first and then used Quick (Delauney) for the volume mesh before creating the prism layers.
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Old   June 26, 2015, 10:01
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Sebastian Engel
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There are no hanging nodes with the settings you used to split the BL. That's why your trail elements collapse into the corresponding parent element before splitting. With hanging nodes your mesh would "look" better... whether your CFD code supports hanging nodes... well, not many codes like to deal with such nodes.

Anyway...

Is there a reason for not creating the 20 boundary layers on the first mesh run (when you created just 4 layers)? I believe, when you do so you should also be able to put the wanted growth rate, instead of redistributing.
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Old   June 29, 2015, 18:52
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Rohith Giridhar
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Dear sir,

Thank you very much for your reply.As you had suggested, I tried to create the 20 prism layers with suitable growth ratio and intial height in my first mesh run itself. However, the prism layers did not get created and I got errors that said that cells near "certain co-ordinates" occupy the same volume cells.

So now, I tried to create one prism layer and then split the same till I got 20 prism layers and then redistributed the same. The prism layers now look better than the first time and I have attached a picture of the same.

Then I smoothed the tetras freezing everything else with an upto value of 0.4 and then smoothed everything with an upto value of 0.01. I have attached a picture of the prism layers near the trailing edge that I obtained after this.

I have mentioned all the steps that I used because I am new to ICEM and if there is any mistake in the steps that I have followed, please let me know sir. Or could you please let me know, if the prism layers that I have got this time are acceptable.
Thank you sir!
Attached Images
File Type: png near trailing edge of blade.PNG (48.6 KB, 35 views)
File Type: png after smoothing.PNG (37.3 KB, 25 views)
File Type: png prism layers near trailing edge.PNG (31.7 KB, 23 views)

Last edited by Rohith Giridhar; June 29, 2015 at 19:16. Reason: attaching another picture to illustrate the prism layers
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