Free Falling Fluid Flow
 

Hi All,

I am trying to model water curtain (rain curtain; free falling flow on a wire) and trying to calculate mass transfer between environment. So I have used every multiphase model available in Fluent and all in all I have the same problem.
Some how (instead of choosing open channel flow, bottom and top level) there has been back flow at the bottem which is outlet. I can not solve out this problem, I have attached a video, I will appreciate for any replies,

http://hizliresim.com/W2mXbQ

Thanks in Advance,
Boreas