# velocity profile

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 January 14, 2013, 08:21 velocity profile #1 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 6 Dear friends, i am trying to plot the velocity profile for a flowing fluid at cross section of open channel using fluent. I have done modelling as well as meshing. Beside these in fluent, i have switched on gravity, in models, i have chosen volume of fluid model>open channel flow, checked energy equation and used k-epsilon (2 eqn.). I have given water as primary and air as secondary phases. Besides these all are set as default. Still i am not getting the correct velocity profile. please help me. I got stuck since a long time.

 January 18, 2013, 17:16 #2 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 6 Dear friends, is there no one who is able to help me?

 January 19, 2013, 05:31 #3 Senior Member   SSL Join Date: Oct 2012 Posts: 227 Rep Power: 6 It is an easy problem. Which boundary conditions have you use? There is no need to enable energy equation.

 January 19, 2013, 06:29 #4 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 6 Sir, boundary conditions are as follows: (1)At velocity inlet- v=0 at inlet initial gauge pressure= 0 turbulence specification method- Intensity and hydraulic diameter temperature= 300K (2)At pressure outlet- back-flow direction specification method- Normal to boundary turbulence specification method- Intensity and hydraulic diameter temperature= 300K checked the open channel in multiphase tab where- pressure specification method- from neighbouring cell bottom level i selected which is at outlet side. (3)Stationary walls- wall motion- stationary wall shear condition- no shear wall roughness- roughness constant= 0.5 roughness height = 0 wall adhesion- contact angle(air-water)= 90 degree All remaining conditions are default.

 January 19, 2013, 06:55 #5 Senior Member   SSL Join Date: Oct 2012 Posts: 227 Rep Power: 6 in open channels you should use outflow instead of pressure outlet.

 January 20, 2013, 09:02 #6 Member   Rohit kumar Mittal Join Date: Sep 2012 Posts: 41 Rep Power: 6 As per your saying, i used outflow instead of pressure outlet. What is flow rate weighting? Although i took its value equal to one. But still i am not getting the correct velocity profile. Sir, if you have already done it before, kindly mail me the way in which i should proceed at rkmittal1108@gmail.com I will be very thankful to you.

 January 20, 2013, 10:08 #7 Senior Member   SSL Join Date: Oct 2012 Posts: 227 Rep Power: 6 Set it 1 if you have just one outlet. Else you should define fraction of flow that gets out of the domain from each outlet.

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