InterFoam and boundary conditions

matejmuller · October 5, 2011, 16:07

Hello!

I'm new in CFD so please excuse my ignorance. I want to simulate a 3D flow in a channel with free surface and an inflow and outflow boundary. I'm using interFoam to do this, but i can't get the boundary conditions right. I have tried on the inlet boundary to use a fixed value for U, zerogradient for p and fixed value for alpha, but i don't know what to prescribe on the outlet boundary (inletOutlet for U and totalPressure for p?). Please help me on this, Thanks, Matej

ata · October 6, 2011, 13:58

Hi
You can use totalPressure for p_rgh and pressureInletOutletVelocity for U and zeroGradient for alpha1
Good luck

matejmuller · October 7, 2011, 08:46

Thank you for your answer...I don't know if i understand this totalPressure boundary, does this mean than you prescribe a constant total energy and the water surface then adjusts itself according to the calculated velocity? Is the pressureInletOutletVelocity boundary for U as a zerogradient for the outflow? thanks

ata · October 7, 2011, 12:28

Hi
Not exactly. You can see the source code for details.
Good luck
Ata

October 5, 2011, 16:07	InterFoam and boundary conditions	#1
matejmuller New Member Matej Muller Join Date: Oct 2011 Location: Slovenia Posts: 25 Rep Power: 14	Hello! I'm new in CFD so please excuse my ignorance. I want to simulate a 3D flow in a channel with free surface and an inflow and outflow boundary. I'm using interFoam to do this, but i can't get the boundary conditions right. I have tried on the inlet boundary to use a fixed value for U, zerogradient for p and fixed value for alpha, but i don't know what to prescribe on the outlet boundary (inletOutlet for U and totalPressure for p?). Please help me on this, Thanks, Matej

October 6, 2011, 13:58	InterFoam and boundary conditions	#2
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 17	Hi You can use totalPressure for p_rgh and pressureInletOutletVelocity for U and zeroGradient for alpha1 Good luck

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October 7, 2011, 08:46		#3
matejmuller New Member Matej Muller Join Date: Oct 2011 Location: Slovenia Posts: 25 Rep Power: 14	Thank you for your answer...I don't know if i understand this totalPressure boundary, does this mean than you prescribe a constant total energy and the water surface then adjusts itself according to the calculated velocity? Is the pressureInletOutletVelocity boundary for U as a zerogradient for the outflow? thanks

October 7, 2011, 12:28		#4
ata Senior Member ata kamyabi Join Date: Aug 2009 Location: Kerman Posts: 323 Rep Power: 17	Hi Not exactly. You can see the source code for details. Good luck Ata