backflow volume fraction

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 August 29, 2002, 03:33 backflow volume fraction #1 fei Guest   Posts: n/a I use the multiphase model,in the pressure outlet boundary condition,there is a "backflow volume fraction",i don't understand what's these means,maybe you can help me.Thanks for your help!!!

 September 1, 2002, 10:47 Re: backflow volume fraction #2 sri Guest   Posts: n/a the backflow vof is used only when there is a reverse flow at the outlet.your convergence would be faster if you give a reasonable value.

 September 1, 2002, 20:09 Re: backflow volume fraction #3 fei Guest   Posts: n/a thank you very much!another thing is how can get the backflow vof,may through the experiment?

 September 2, 2002, 03:40 Re: backflow volume fraction #4 sri Guest   Posts: n/a this value has to be intutively.when reverse flow is expected in your domain,then the value has to come from experiments

 September 2, 2002, 18:44 Re: backflow volume fraction #5 fei Guest   Posts: n/a your help is very useful,thank you very much.

 February 19, 2011, 07:29 #6 Senior Member     Join Date: Jan 2010 Posts: 347 Blog Entries: 2 Rep Power: 10 Hi, how can i set outlet volume fraction when set pressure outlet? is it related to backflow? regards.

 February 19, 2011, 12:53 #7 New Member   Michael Join Date: Nov 2010 Posts: 23 Rep Power: 8 In regards to this.. could the backflow volume fraction be used to restrict the seondary phase from leaving the system at a pressure outlet?

 February 19, 2011, 14:32 #8 Senior Member     Join Date: Jan 2010 Posts: 347 Blog Entries: 2 Rep Power: 10 Thanks, So you mean if back flow volume fraction set to 1 only that phase can exit from that patch? What's your idea about above comments about backflow?

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