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FLUENT VOF for ship's hull

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Old   December 1, 2008, 12:23
Default FLUENT VOF for ship's hull
  #1
simone b.
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Hi everyone, I'm trying to simulate the flow around ship and I use multiphase flow VOF in FLUENT for analize this type of problem. I use a fully hexa mesh with high qualty ( determinant 3x3 from 0.6 to 1) generated with ICEM CFD

My setting is Reynolds Stress Model, VOF Implicit with open channell formulation, seady state I've tryied a k-w SST viscous model too.

I have some problem about this simulation:

1) My simulation diverge with k-w SST, and with the RSM i need to decrease more the under relaxation factor (0.15 max)

2) If i try to simulate a case with y+=50 or less, after 200 iteration the simulation diverge.

What can i do?? What type of setting is required??

If someone have any information or solution fot this type of problem please send me at my email : simone.bartesaghi@alice.it

Thank's for attention.

regards, simone
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Old   December 2, 2008, 05:30
Default Re: FLUENT VOF for ship's hull
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simone b.
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Anyone can help me?? Please i'm in very difficulties....
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Old   December 2, 2008, 07:24
Default Re: FLUENT VOF for ship's hull
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Bikini Girl with Machinegun
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1. Nobody will be able to help you when you give very few details about your problem.

2. People help when they can. You can't hurry them because you have a deadline.

3. You are using CFD on ship problems. Haha! Which idiot talked you into doing that?

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Old   December 2, 2008, 07:53
Default Re: FLUENT VOF for ship's hull
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Julien
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A little harsh, don't you think Bikini Girl?

The guy is desperate and needs help. Plus, he did a reasonable job of explaining his problem, at least enough to get a discussion going. Unfortunately, I do not use Fluent, so I can't help.

I'm guessing the Fluent tech support was of no use?
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Old   December 2, 2008, 14:29
Default Re: FLUENT VOF for ship's hull
  #5
Charles
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The most helpful answer I can give you is to underrelax the solution dramatically until it has stabilised. When I say dramatically, I mean that for the segregated solver you would be looking at relaxation factors of 0.05 or so, and for the coupled solver a CFL < 0.2. Some solutions will only work with the coupled solver. If you are desperate, give me some money and I will do it for you

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Old   December 6, 2008, 08:45
Default Re: FLUENT VOF for ship's hull
  #6
Ranga
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Its seems to be tough in fluent using VOF. I think you may switch over to ANSYS CFX 11.0. Robust solver.
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