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[ICEM] Skewed element - Radiused surface -fillet

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Old   August 13, 2013, 15:30
Default Skewed element - Radiused surface -fillet
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Luca
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Dear all,

I have some skewed elements because of a fillet. I have attached the CAD model, blocks strategy and mesh result. Have you ever dealt with this kind of problem? Do you think that I have to change my blocks strategy? thank you in advance

best regards
Luca Metelli
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File Type: jpg fillet.jpg (35.3 KB, 26 views)
File Type: jpg fillet2.jpg (74.5 KB, 26 views)
File Type: jpg fillet3.jpg (95.5 KB, 24 views)
File Type: jpg fillet4.jpg (32.7 KB, 17 views)
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Old   August 14, 2013, 03:14
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I can't think of any way to get around this except for making the block follow around the surface of the diffuser inlet, and then create an unstructured swept block on the adjacent edge of the diffuser wall.

Nothing else springs to mind right now, maybe someone else may have a useful topology.

Stu
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Old   August 14, 2013, 10:36
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Two thoughts...

1) If your solver doesn't mind prism elements, you could use a collapsed block or a swept block instead of the quarter ogrid block...

2) you could deflect that wedge down into the space below it... Those blocks would get compressed a bit, but it would open up the angle and give your elements more space.
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Old   August 14, 2013, 10:47
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Dear Stuart and Simon,

thanks a lot for your replies. I will try to follow your suggestion and I will let you know.

best regards,

Luca Metelli
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Old   August 14, 2013, 13:02
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Quote:
Originally Posted by PSYMN View Post
Two thoughts...

1) If your solver doesn't mind prism elements, you could use a collapsed block or a swept block instead of the quarter ogrid block...

2) you could deflect that wedge down into the space below it... Those blocks would get compressed a bit, but it would open up the angle and give your elements more space.

Dear Simon,

I have tried your second option but I'm not sure if I have understood properly what you mean. The solution that I have tried in shown in the first image attached; this strategy solves the problem on the "blue" plane but not on the side plate (yellow) as I can't deform the edge down in that way without altering the geometry of the model.

Can you please tell me the steps to follow in your first solution? (collapsed or swept) thank you

best regards
Luca
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Old   August 14, 2013, 14:36
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Oh, sorry, I didn't realize that ledge was there preventing you from deforming...

The other solution (collapsed block) is just to create a wedge block (with a row of prisms on the sharp end).

How did you create your Y-Block? A collapsed block is easier.

You can merge pairs of verts or create it bottom up from 6 verts...
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Old   August 14, 2013, 15:02
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Actually I was trying to have a first row of prisms elements but I don't know how to do that. I think that I know how to create an edge block, the problem is how to generate prisms. Am I supposed to convert it in a free block or swept block? After that how I can create a mesh of prisms elements and merge it with the structured grid? Than you

When I created the blocks I deleted the block under the diffuser and then I created a wedge block manually. After that I just used "create Y-grid".

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