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Washing machine simulation using VOF

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Old   March 24, 2009, 16:04
Default Washing machine simulation using VOF
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Felipe Gutiérrez Donoso
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Hi Fluent experts,

I´m trying to simulate a vertical washing machine using VOF.

I´ve done a cylinder with it´s side face rotating at 5 rad/s, created two phases (air and water), I´m using k-e NRG turbulent model, but when I´m solving, it doesn´t converge.

Any tips?? does anyone did something like this?? It´s just a rotating fluid in a cilinder with two phases, but can´t get it to work.
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Old   March 25, 2009, 13:33
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zhao peng
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Did you patch the water/air volume fraction? the water phase also need to define a swirl velocity.
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Old   March 25, 2009, 19:37
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Felipe Gutiérrez Donoso
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yes, I´ve patched the water fraction, the swirl velocity is defined as a boundary condition in the outer face, rotating around a central axis.
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Old   March 26, 2009, 01:08
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zhao peng
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only define a velocity boundary is not enough.I advise you define a custom field function about the initial swirl velocity for the water phase,that is good for the convergence.
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Old   March 27, 2009, 04:46
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Zamir Rashid
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Are you doing a steady state or transient case? Can you try using the rotating reference frames rather then just wall rotating velocity?
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Old   April 1, 2009, 16:03
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Felipe Gutiérrez Donoso
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I´ve done a initial swirl function, but stil doesn´t work
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Old   April 1, 2009, 16:06
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Felipe Gutiérrez Donoso
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i´m running the transient case to see how is the behaviour of the simulation, because the steady one didn´t converge.
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Old   April 1, 2009, 16:08
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My suggestion, check your mesh. Do not necessarily increase cell numbers, but check its structure, how well it is made. In my past, what I figured out if mesh looks "nasty" then sometimes often simulation might not even start.
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Old   September 20, 2010, 02:03
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Rana
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Felipe,do u have any materials or literature regarding the washing machine simulation?
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