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December 1, 2008, 12:23 |
FLUENT VOF for ship's hull
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#1 |
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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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December 2, 2008, 05:30 |
Re: FLUENT VOF for ship's hull
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#2 |
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Anyone can help me?? Please i'm in very difficulties....
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December 2, 2008, 07:24 |
Re: FLUENT VOF for ship's hull
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#3 |
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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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December 2, 2008, 07:53 |
Re: FLUENT VOF for ship's hull
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#4 |
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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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December 2, 2008, 14:29 |
Re: FLUENT VOF for ship's hull
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#5 |
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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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December 6, 2008, 08:45 |
Re: FLUENT VOF for ship's hull
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#6 |
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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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