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-   -   [ICEM] Tetra + prism turbine blade (http://www.cfd-online.com/Forums/ansys-meshing/103614-tetra-prism-turbine-blade.html)

sarah4 June 21, 2012 10:07

Tetra + prism turbine blade
 
3 Attachment(s)
Hello, I am using Tetra + prism method to mesh fluid domain around a turbine blade.I have got good elements except around the tip and the root(see pics). I tried to smooth(first tetra then prism and tetra together),but even worse quality appeared.

Can anybody share any experience about this kind of cases? What is the difference between tick on and tick off the Laplace smooth function?I always got worse quality with it on.

Or the bad elements could be due to other factors?

Any advice is welcome.

Far June 21, 2012 11:28

For these type of cases ICEM Hexa is the best choice...

sarah4 July 1, 2012 06:41

1 Attachment(s)
Quote:

Originally Posted by Far (Post 367681)
For these type of cases ICEM Hexa is the best choice...

Hello Far,

Thanks for your reply.

It is difficult to get a good quality using tetra+prisms while the boundary layer mesh goes too fine.

I have also tried ICEM hexa, using o block +split at the trailing edge, but resulted bad cells again around the sharp trailing edge .I have seen your video on youtube"wing with sharp trailing edge". I must missed something. I do not know if you could look at my problem here.

Far July 1, 2012 06:59

Ya you missed the o-grid in front half of leading block (inside) and Y block in aft tip block

sarah4 July 1, 2012 08:43

Quote:

Originally Posted by Far (Post 369079)
Ya you missed the o-grid in front half of leading block (inside) and Y block in aft tip block

Is this what you mean? but i still got bad cells...

Far July 1, 2012 08:45

Quote:

Originally Posted by sarah4 (Post 369111)
Is this what you mean? but i still got bad cells...

I didn't get you. Could you please elaborate more?

sarah4 July 1, 2012 08:45

1 Attachment(s)
Sorry pic here

Far July 1, 2012 08:46

did you convert the wedge block into yblock?

sarah4 July 1, 2012 08:49

Yes tried
but it seemed that it cannot be converted. "number of degenerate corner !=2"

Far July 1, 2012 08:50

send files at turboenginner@gmail.com and/or attach to this forum.

sarah4 July 1, 2012 08:59

I realised that this is not a wedge block. ..it has 8 corners so cannot be converted

Far July 1, 2012 09:00

merge vertices at trailing edge (i hope you have sharp trailing edge)

sarah4 July 1, 2012 09:11

Thanks for your video and quick reply here.


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