open channel flow: pressure-inlet

jack1980 · March 2, 2010, 08:32

Hi,

For open channel flow, concerning a ship in a towing tank, I have set pressure-inlet and pressure-outlet. I have specified free-surface levels and inflow velocity. The problem is: at the inlet, the water has the correct velocity, but the air does not. This leads to reverse flow, unrealistically high velocities, and unexpected turbulence. I can 'solve' this by increasing the air viscosity such that it is dragged along by the water, but of course this is not a very nice option.

How can I set the correct inflow velocity for the air as well?

I'm working in Fluent 6.3.26

Thanks!

siamakghh2000 · October 21, 2012, 15:15

hey, a question. how do u calculate the velocity in one pf the phases, such as air?

March 2, 2010, 08:32	open channel flow: pressure-inlet	#1
jack1980 Senior Member Jouke de Baar Join Date: Oct 2009 Posts: 127 Rep Power: 17	Hi, For open channel flow, concerning a ship in a towing tank, I have set pressure-inlet and pressure-outlet. I have specified free-surface levels and inflow velocity. The problem is: at the inlet, the water has the correct velocity, but the air does not. This leads to reverse flow, unrealistically high velocities, and unexpected turbulence. I can 'solve' this by increasing the air viscosity such that it is dragged along by the water, but of course this is not a very nice option. How can I set the correct inflow velocity for the air as well? I'm working in Fluent 6.3.26 Thanks!

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October 21, 2012, 15:15		#2
siamakghh2000 New Member Siamak Gharahjeh Join Date: Aug 2012 Posts: 27 Rep Power: 14	hey, a question. how do u calculate the velocity in one pf the phases, such as air?