1D flow

canopus · July 18, 2011, 06:23

I am solving pressure poisson eqn for N-S eqns for unconfined flow.
I want to solve a laminar 1D flow with that by using
1 cell in x & y axis and 300 cells in z dir.
I am specifying a velocity at inlet and neuman BC for outlet.

Is this approach correct?

What should be my BCs with respect to pressure for?
x-y(inlet & outlet)
x-z(top & bottom)
y-z(side faces)

What should be my BCs with respect to velocity for?
x-z(top & bottom)
y-z(side faces)

Thanks in advance

nimasam · July 18, 2011, 06:40

use empty patch for top and bottom and side faces
for pressure u can use zeroGradient in inlet and fixedPressure at outlet

canopus · July 18, 2011, 06:50

Thank you for the reply.
Can you please explain what empty does theoretically to the velocity and pressure?

July 18, 2011, 06:23	1D flow	#1
canopus New Member SM Join Date: Dec 2010 Posts: 21 Rep Power: 4	I am solving pressure poisson eqn for N-S eqns for unconfined flow. I want to solve a laminar 1D flow with that by using 1 cell in x & y axis and 300 cells in z dir. I am specifying a velocity at inlet and neuman BC for outlet. Is this approach correct? What should be my BCs with respect to pressure for? x-y(inlet & outlet) x-z(top & bottom) y-z(side faces) What should be my BCs with respect to velocity for? x-z(top & bottom) y-z(side faces) Thanks in advance

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July 18, 2011, 06:40		#2
nimasam Senior Member Nima Sam Join Date: Sep 2009 Location: Tehran, Iran Posts: 758 Blog Entries: 1 Rep Power: 9	use empty patch for top and bottom and side faces for pressure u can use zeroGradient in inlet and fixedPressure at outlet

July 18, 2011, 06:50		#3
canopus New Member SM Join Date: Dec 2010 Posts: 21 Rep Power: 4	Thank you for the reply. Can you please explain what empty does theoretically to the velocity and pressure?