Two Fluids Flow

Y_G · August 8, 2011, 02:23

Hi everybody
I'm trying to model a flip-bucket with two fluids (air and water). simulation solves the flow on chute but when the flow reaches to the lip of the flip-bucket, simulation can not solve the pressure (pressure iteration did not converge at ITMAX). I've totally tried lot's of conditions for example VOF method, different mesh size, turbulence model, number of iteration, time step, but didn't work. does anybody have an Idea?
thanks.

nirajshah85 · September 19, 2011, 05:40

Hello Yaser,
I think you can model a Flip-bucket with one fluid free surface flow in F3D. You can use the air entrainment model alongwith the simulation to check on the air entrained in the water.

If for the simulation you believe that there is a large amount of air entrainment to have density change then you can also activate the density model and in case if you are also modelling the downstream area then you can also have the drift flux model activated to allow the trapped/entrained air to escape to the surface.

mf_emp · November 13, 2012, 07:35

Hi, did you find what was the problem??
I had this problem too!
I also tried density evaluation and drift flux model but no correct answers!!
I'm working on U-shaped spillway.

August 8, 2011, 02:23	Two Fluids Flow	#1
Y_G New Member yaser geraili Join Date: Feb 2011 Posts: 5 Rep Power: 15	Hi everybody I'm trying to model a flip-bucket with two fluids (air and water). simulation solves the flow on chute but when the flow reaches to the lip of the flip-bucket, simulation can not solve the pressure (pressure iteration did not converge at ITMAX). I've totally tried lot's of conditions for example VOF method, different mesh size, turbulence model, number of iteration, time step, but didn't work. does anybody have an Idea? thanks.

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September 19, 2011, 05:40		#2
nirajshah85 New Member Niraj Shah Join Date: Nov 2010 Posts: 3 Rep Power: 15	Hello Yaser, I think you can model a Flip-bucket with one fluid free surface flow in F3D. You can use the air entrainment model alongwith the simulation to check on the air entrained in the water. If for the simulation you believe that there is a large amount of air entrainment to have density change then you can also activate the density model and in case if you are also modelling the downstream area then you can also have the drift flux model activated to allow the trapped/entrained air to escape to the surface.

November 13, 2012, 07:35		#3
mf_emp New Member Mahdiar Farhoudi Join Date: Feb 2012 Location: Tehran, Iran Posts: 17 Rep Power: 14	Hi, did you find what was the problem?? I had this problem too! I also tried density evaluation and drift flux model but no correct answers!! I'm working on U-shaped spillway.