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Old   March 28, 2014, 20:47
Default Meshing a sharp tip of an engine spinner
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Hi guys!

Could you please advise as how to mesh the sharp tip of an engine spinner? My first attachment shows what I've got. Don't bother with element sizes, I've set a course mesh indeed.

I reckon I should not split the block as I did in the 1st image and put the 4 vertices in a single point, that is, the tip. This would give me quite skewed elements, not good.

A way out is to do something similar to my 2nd attachment.

Now the question, how I make it? It's not mine and I can't quite figure his blocking strategy and how he managed to do it. I've been trying not successfully as my 3rd attachment shows.

So, any ideas?!

Cheers
Attached Images
File Type: jpg spinner_issue.jpg (65.2 KB, 27 views)
File Type: jpg how should be.jpg (71.5 KB, 24 views)
File Type: jpg detail.jpg (40.5 KB, 24 views)
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Old   March 31, 2014, 12:19
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Ghazlani M. Ali
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Have you solved your problem ?
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New to ICEM CFD, try this document --> http://goo.gl/G2gkE
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Old   April 1, 2014, 09:06
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Hi Ghazlani,

Well, sort of, I've actualy done something to avoid this situation. I modified the CAD geometry and made the tip flat near the leading point so that I can simply mesh this new surface.

I'm having some other issues though.

Can I ask which is the right approach when performing a fully structured multi block mesh? My farfield is a semisphere, but my pre-mesh gets me overlapping and negative volume elements in the first o-grid (from the central block edges up to the outer bounday of the semisphere). Why does it happen? I mean, it's just a semisphere, shouldn't be a big deal. All the remaining looks fine when I check it, but the simpler part gets messed up. I realized that if I smooth the mesh, it takes me hours but gets me the farfield fixed. However, it messes with the geometry surface mesh (negative volume).

Should I smooth the farfield o-grid first before keeping on with the blocking? Is it the usual approach?
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Old   April 1, 2014, 13:25
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Sijal Ahmed Memon (turboenginner@gmail.com)
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you can follow steps in tutorial "hexa meshing around a cone" on ansys portal
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Old   April 1, 2014, 14:11
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Sijal Ahmed Memon (turboenginner@gmail.com)
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here is the snapshot for the type1 blocking (total 3 blocking methods are shown in tut)

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Last edited by Far; April 1, 2014 at 15:29.
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