# Washing machine simulation using VOF

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 March 24, 2009, 16:04 Washing machine simulation using VOF #1 Member   Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 9 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.

 March 25, 2009, 13:33 #2 Member   zhao peng Join Date: Mar 2009 Posts: 41 Rep Power: 9 Did you patch the water/air volume fraction? the water phase also need to define a swirl velocity.

 March 25, 2009, 19:37 #3 Member   Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 9 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.

 March 26, 2009, 01:08 #4 Member   zhao peng Join Date: Mar 2009 Posts: 41 Rep Power: 9 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.

 March 27, 2009, 04:46 #5 New Member   Zamir Rashid Join Date: Mar 2009 Posts: 1 Rep Power: 0 Are you doing a steady state or transient case? Can you try using the rotating reference frames rather then just wall rotating velocity?

 April 1, 2009, 16:03 #6 Member   Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 9 I´ve done a initial swirl function, but stil doesn´t work

 April 1, 2009, 16:06 #7 Member   Felipe Gutiérrez Donoso Join Date: Mar 2009 Posts: 31 Rep Power: 9 i´m running the transient case to see how is the behaviour of the simulation, because the steady one didn´t converge.

 April 1, 2009, 16:08 #8 Senior Member   Join Date: Mar 2009 Posts: 225 Rep Power: 10 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.

 September 20, 2010, 02:03 #9 New Member   Rana Join Date: Apr 2010 Posts: 10 Rep Power: 8 Felipe,do u have any materials or literature regarding the washing machine simulation?

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