180 Degree Bend Duct Flow in FLUENT

John222 · July 25, 2012, 08:49

I'm simulating a 2D U-bend duct using FLUENT.

Properties from experimental case are;

U= 31.1m/s.
Mach= 0.1.
Operating Pressure= 12atm.
Re=10^6.

What are the boundary conditions at inlet and outlet?

flotus1 · July 25, 2012, 09:10

If you don't know where and how the values were measured, I would try a velocity inlet with a bulk velocity of U and a pressure outlet at the operating pressure.

John222 · July 25, 2012, 09:11

Quote:

Originally Posted by flotus1

If you don't know where and how the values were measured, I would try a velocity inlet with a bulk velocity of U and a pressure outlet at the operating pressure.

So you mean at inlet I should have 31.1 with 0 pressure, and at outlet 12atm operating pressure?

flotus1 · July 25, 2012, 10:23

As far as I know you do not need to specify a value for pressure at a velocity inlet.
The pressure at the inlet will be a result of your simulation.

July 25, 2012, 08:49	180 Degree Bend Duct Flow in FLUENT	#1
John222 Member John Join Date: Jan 2011 Posts: 58 Rep Power: 4	I'm simulating a 2D U-bend duct using FLUENT. Properties from experimental case are; U= 31.1m/s. Mach= 0.1. Operating Pressure= 12atm. Re=10^6. What are the boundary conditions at inlet and outlet?

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July 25, 2012, 09:10		#2
flotus1 Senior Member Alex S. Join Date: Jun 2012 Location: Germany Posts: 479 Rep Power: 10	If you don't know where and how the values were measured, I would try a velocity inlet with a bulk velocity of U and a pressure outlet at the operating pressure.

July 25, 2012, 10:23		#4
flotus1 Senior Member Alex S. Join Date: Jun 2012 Location: Germany Posts: 479 Rep Power: 10	As far as I know you do not need to specify a value for pressure at a velocity inlet. The pressure at the inlet will be a result of your simulation.