# simulation of liquid thin film

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 February 10, 2011, 20:35 simulation of liquid thin film #1 New Member   Samanjoy Barua Join Date: Feb 2011 Posts: 1 Rep Power: 0 Hi, I am using vof method to analyzing of liquid thin film, When i am using two phase flow, unsteady, and implicit body force. When simulation running its showing reverse flow in diffferent phases. I am confused i am correct way or not. any body can help me pls. My 2d model geometry is 40mm inclined plate, geometry made in Gambit, where two phase liquid and Gas which are flowing parallel flow, Boundary condition are liquid inlet( velocity inlet) gas inlet (pressure inlet), mass flow(Pressure Outlet) I have considered low Reynolds number, Surface Tension, Gravitational force. Is there any which I have to consider, and any necessary information please give details. I dont want to heat transfer effect. thank you very much Saman Last edited by Saman; February 11, 2011 at 18:41.

 February 11, 2011, 02:26 #2 Senior Member   Nima Samkhaniani Join Date: Sep 2009 Location: Tehran, Iran Posts: 1,266 Blog Entries: 1 Rep Power: 24 ur information is so few at least you should talk about geometry, boundary condition and so on ....

March 10, 2018, 21:33
#3
Member

wan zhihua
Join Date: Dec 2017
Posts: 67
Rep Power: 8
Quote:
 Originally Posted by Saman Hi, I am using vof method to analyzing of liquid thin film, When i am using two phase flow, unsteady, and implicit body force. When simulation running its showing reverse flow in diffferent phases. I am confused i am correct way or not. any body can help me pls. My 2d model geometry is 40mm inclined plate, geometry made in Gambit, where two phase liquid and Gas which are flowing parallel flow, Boundary condition are liquid inlet( velocity inlet) gas inlet (pressure inlet), mass flow(Pressure Outlet) I have considered low Reynolds number, Surface Tension, Gravitational force. Is there any which I have to consider, and any necessary information please give details. I dont want to heat transfer effect. thank you very much Saman
my problem is the same to you ,what is the other condition other than you have discussed?

March 10, 2018, 21:48
I meet the same problem about the reverse flow.
#4
Member

wan zhihua
Join Date: Dec 2017
Posts: 67
Rep Power: 8
Quote:
 Originally Posted by nimasam ur information is so few at least you should talk about geometry, boundary condition and so on ....
Hi,I am glad to find you answer the question,I have the same problem,I want to put the image of my model to this forum,but when I try klick the icon upside, it cannot ,I do not know what is the reason ,if you are convinent,I can send to your e-mail.My model is a 2-dimension rectangle channel,the water film falls from upside by one wall, it's condition sets a constant velocity,the gas inlet and the wall sets as a no slip wall.The side contrary to the wall and the outlet sets as a pressure outlet conditon with a default setting.I use the VOF model ,the velocity -pressure equation use the PISO method ,Geo-reconstruction is used,I monitor the mass flow rate of the outlet ,the average mass flow rate is equally to the inlet,but in the simulation,the reverse flow always exists anytime.After I analysis , I think it is not reasonable ,can you help me find the problem,thank you very much.my e-mail is hitzhwan@163.com

 March 11, 2018, 00:55 #5 Senior Member     Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 744 Rep Power: 15 I recommen: - simplify your case to the point where it ist simplest but shows your isue. - after allclear zip the case and store it togehther with some explaining pictures at an internet store - link it here. __________________ Uwe Pilz -- Die der Hauptbewegung überlagerte Schwankungsbewegung ist in ihren Einzelheiten so hoffnungslos kompliziert, daß ihre theoretische Berechnung aussichtslos erscheint. (Hermann Schlichting, 1950)

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