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Old   April 7, 2008, 04:15
Default VOF model
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heri
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I'm a spanish engineer student and I've some problems with development of VOF model in Fluent (3Ddp) and I need some help. I'm trying to simulate the free surface behaviour in a mold containning liquid steel, i.e., two different phases (air and steel) are required. The steel jets into the mould cavity througha nozzle. I chose liquid steel as phase1 and air as phase2. Previously, I selected VOF model with Geo-Reconstruct Scheme such as an unsteady problem. Then I adapted the region and I patch it as phase2. When I start the iteration process divergences occur at few iterations. Other settings:

Unstructural mesh with tetraedral cells ( Max Skew: 0.84, 132295 cells) Energy Equation (marked) Boundary conditions: Velocity Inlet Pressure outlet Walls Viscous model: k-epsilon standard Discretization: Pressure-Velocity Coupling: PISO Pressure: Body Force Weighted

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Old   April 7, 2008, 14:36
Default Re: VOF model
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Renato Pacheco
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divergence in VOF models happened to me with poor mesh or with not so small time step size.
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Old   April 8, 2008, 02:08
Default Re: VOF model
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sudhir
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change the phases.give air as primary phase and liquid iron as secondary phase.
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Old   April 9, 2008, 05:03
Default Re: VOF model
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heri
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I've tried what you posted, but the solution still diverge. Fluent shows me the follow warning: ''Error: Floating point error: overflow''.
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Old   April 9, 2008, 18:09
Default Re: VOF model
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samnetmoon
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hi, me too i am a student engineer, i am working on the same work, if you would like to help you send me you gambit and mesh file, and tutorial if you have i will help you if god willing...
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Old   April 21, 2008, 06:02
Default Re: VOF model
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Gaurav Mehra
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Hi. Samentmoon and heri! I am exactly stuck in the same problem. tracking the same free surface of fluid inside a cylinder with air water being two phases and injecting water from bottom inlet. My cylinder is submerged in the water (80 cm cylinder , 50 cm inside water) I am giving velocity or pressure at the bottom water particles and trying to see the effects on the free surface of it.Kindly tell me if you have got any solution of the problem. I am facing the same error when I try to iterate- " fatal floating point error" I think we are making some value either too small or two big. and by the way we can personally mail each other and chat on some messenger. my email id is NA04B011@smail.iitm.ac.in
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Old   April 22, 2008, 11:02
Default Re: VOF model
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heri
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Hi Gaurav, I've been studied some VOF examples and I think we could try to add a dynamic grid adaptation. This option could be razonable for control volumes. Regards.
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