Undular hydraulic jump
 

Hey!
I'm trying to represent an undular hydraulic jump in a circular pipe in 3D.
I found a paper in which this problem is taken care in 2D in an open wide channel.
I've tried applying some of the conditions and characteristics of the problem to mine without any success...
If anybody has some advice, information or anything that could guide me in order to represent this phenomenom in FLUENT it would be very useful.