Flow in an Orifice Meter

Ftaiv · December 9, 2014, 20:48

Hi!

I am running a 2D steady turbulent simulation for a flow through an orifice (D=90mm, Beta=0.35, V_in=1.01m/s), I am quite unclear as to which solver to use between coupled and segregated? Should I use pressure-based or density-based?

Thanks in advance y'all !

LuckyTran · December 10, 2014, 10:58

Assuming the fluid is air-like, the throat Mach number seems low for an orifice (M~0.03). Since it seems the flow is incompressible, I think you can get away with using the pressure based solver.

The continuity, momentum, and energy equation, if used, are always coupled in the density based solver.

Any of the P-V coupling in the pressure-based solver can be used: SIMPLE or PISO if segregated or coupled. The difference in the P-V coupling schemes mostly affects the number of iterations until convergence.

Ftaiv · December 10, 2014, 12:40

Thanks for the tips, much appreciated

December 9, 2014, 20:48	Flow in an Orifice Meter	#1
Ftaiv New Member Join Date: Oct 2014 Posts: 3 Rep Power: 11	Hi! I am running a 2D steady turbulent simulation for a flow through an orifice (D=90mm, Beta=0.35, V_in=1.01m/s), I am quite unclear as to which solver to use between coupled and segregated? Should I use pressure-based or density-based? Thanks in advance y'all !

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December 10, 2014, 10:58		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,674 Rep Power: 66	Assuming the fluid is air-like, the throat Mach number seems low for an orifice (M~0.03). Since it seems the flow is incompressible, I think you can get away with using the pressure based solver. The continuity, momentum, and energy equation, if used, are always coupled in the density based solver. Any of the P-V coupling in the pressure-based solver can be used: SIMPLE or PISO if segregated or coupled. The difference in the P-V coupling schemes mostly affects the number of iterations until convergence.

December 10, 2014, 12:40		#3
Ftaiv New Member Join Date: Oct 2014 Posts: 3 Rep Power: 11	Thanks for the tips, much appreciated