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some problem on using turbogrid.

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Old   September 20, 2003, 09:10
Default some problem on using turbogrid.
  #1
Darcy Jiang
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Dear all Does somebody have some experience using TURBOGRID to construct grids(structured grid) arround a propeller on boat? I'm suffering the twisting and poor quality grids near the tip of propeller. Please give some subgestion to overcome the problem. Thx. Darcy
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Old   October 5, 2003, 18:43
Default Re: some problem on using turbogrid.
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Martin Bowers
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Either stop worrying about the quality of your mesh, which is usually a bad idea, or drop Turbogrid and use ICEMCFD HEXA.
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Old   October 6, 2003, 09:28
Default Re: some problem on using turbogrid.
  #3
Darcy Jiang
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yeah, I think so. My co-worker used icem and constructed an unstructured grid with very good quality around the same geometry.
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Old   October 8, 2003, 15:37
Default Re: some problem on using turbogrid.
  #4
Martin Bowers
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Turbogrid 1.x is good at creating a decent quality coarse mesh, but unfortunately it doesn't automatically give a high-quality fine grid, and it doesn't give the user enough control to manually make one. So you're stuck with some relatively low-quality fine grid, that takes EONS to generate.

There's Turbogrid 2.x, which is unstructured, but I haven't seen that yet so I can't offer an opinion. But I will say that unstructured and high-quality are two words for a mesh that don't often go together in my experience.
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Old   October 10, 2003, 12:43
Default Re: some problem on using turbogrid.
  #5
Robin
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Hi Martin,

Perhaps you should try using TurboGrid 2 before commenting!

TurboGrid 2 is not unstructured! It generates high quality HEX grids which can be exported to CFX-5 (without structure) or CFX-TASCflow (block strucutured).

Regards, Robin
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Old   December 25, 2003, 01:14
Default Geomerty and meshing with CFX
  #6
Bob Crad
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Dear Robin,

Merry Christmas to you!

I am in choosing a CFD package for a coming task where centripetal body forces will be considerable. To my knowledge, SSG model is the best one for rotating domains. That is, particularly, why, CFX seems to be suitable for me.

My concern is, however, the rumours are CFX geometry builder is not very strong and even unstable for real geometries (even if they are not extremely complicated).

Another issue is CFX Build generates only unstructured TET-grid (and prisms for boundary layer), I was told. Well, I would prefer to have a HEX generator.

There is a wide-spread opinion it is impractical to take GEOM-, MESH-, SOLVER and POST from different sources.

That is why, I would like to get you opinion on using BladeGen to make, say, a blade similar to that off a turbocharger blower wheel and then to use TurboGrid to create a good mesh.

Other words, what sort of pre-processor(s) CFX users employ in practice?

Thank you and cordial regards

Bob Crad
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Old   January 4, 2004, 18:23
Default Re: Geomerty and meshing with CFX
  #7
Glenn Horrocks
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Hi Bob,

Robin has disappeared from this discussion group. A sad loss. You can find him on the CFX community discussion group if you want him specifically.

In the meantime I hope the rest of us can give you some useful comments. You can find my reply to your post in your other thread.

Glenn
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