Simulatling Two-fluid models..?

mf_emp · May 27, 2012, 11:04

I wanna simulate 3-sided spillway (U-shaped spillway) model using two-fluid.
Due to the Help menu:
CUSTOM TUTORIALS > Hydraulics Tutorial > Variation: Run as a Two-Fluid Problem
that say's when the two fluid densities vary by a significant amount, a two-fluid model is not accurate!
so how can i simulate my problem?!

Note: The model is highly turbulent.

MuxaB · May 27, 2012, 19:03

Should be ok - have you tried already?

mf_emp · May 28, 2012, 07:48

yes i tried it, but i didn't get correct outputs.
as it say, densities vary by a significant amount.
The primary problem here is that there is only one (mixture) velocity calculated at each cell face. In reality, because the densities are so different for the two different fluids, there is significant discrepancy between the velocity of the air and the velocity of the water. When the densities of the two fluids differ greatly, i.e., roughly by more than a factor of 10, this mixture velocity may not adequately represent the flow, since velocities of each of the fluids in the same cell can be very different.

did anyone Run such a two-fluid case with air & water??

May 27, 2012, 11:04	Simulatling Two-fluid models..?	#1
mf_emp New Member Mahdiar Farhoudi Join Date: Feb 2012 Location: Tehran, Iran Posts: 17 Rep Power: 14	I wanna simulate 3-sided spillway (U-shaped spillway) model using two-fluid. Due to the Help menu: CUSTOM TUTORIALS > Hydraulics Tutorial > Variation: Run as a Two-Fluid Problem that say's when the two fluid densities vary by a significant amount, a two-fluid model is not accurate! so how can i simulate my problem?! Note: The model is highly turbulent.

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May 27, 2012, 19:03		#2
MuxaB Senior Member michael barkhudarov Join Date: Mar 2009 Location: Sante Fe, New Mexico, USA Posts: 337 Rep Power: 18	Should be ok - have you tried already?

May 28, 2012, 07:48		#3
mf_emp New Member Mahdiar Farhoudi Join Date: Feb 2012 Location: Tehran, Iran Posts: 17 Rep Power: 14	yes i tried it, but i didn't get correct outputs. as it say, densities vary by a significant amount. The primary problem here is that there is only one (mixture) velocity calculated at each cell face. In reality, because the densities are so different for the two different fluids, there is significant discrepancy between the velocity of the air and the velocity of the water. When the densities of the two fluids differ greatly, i.e., roughly by more than a factor of 10, this mixture velocity may not adequately represent the flow, since velocities of each of the fluids in the same cell can be very different. did anyone Run such a two-fluid case with air & water??