velocity profile
 

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.

Dear friends,
is there no one who is able to help me?

It is an easy problem.
Which boundary conditions have you use? There is no need to enable energy equation.

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.

in open channels you should use outflow instead of pressure outlet.

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.

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.