SimpleFoam pressure driven flow

gzink · June 5, 2006, 14:12

Hi,

I am a new user of OpenFoam, so I apologize if this is a stupid question. In order to learn the program I am running a very basic inviscid incompressible flow in a straight pipe using simpleFoam. I have pressure boundary conditions on the inlet and outlet. Using these values, I can determine the expected velocity throughout the pipe (using Bernoulli's equation) which I set as an initial condition in the pipe.

After iterating, I get a uniform flow through the pipe (as I expect), but the velocity magnitude seems to increase unboundedly with more and more iterations. Running the exact same case in Fluent converges very quickly, so I assume there is something I am overlooking in OpenFoam as I set up my case.

If anyone has any insight as to what might cause this problem, I'd really appreciate your help. Thanks!

Greg Z.

Tensian · July 2, 2013, 15:23

Hi Greg,
I have the same problem. Have you solved it?
Thanks.

June 5, 2006, 14:12	Hi, I am a new user of Open	#1
gzink New Member Greg Zink Join Date: Mar 2009 Location: Ames, Iowa, USA Posts: 16 Rep Power: 17	Hi, I am a new user of OpenFoam, so I apologize if this is a stupid question. In order to learn the program I am running a very basic inviscid incompressible flow in a straight pipe using simpleFoam. I have pressure boundary conditions on the inlet and outlet. Using these values, I can determine the expected velocity throughout the pipe (using Bernoulli's equation) which I set as an initial condition in the pipe. After iterating, I get a uniform flow through the pipe (as I expect), but the velocity magnitude seems to increase unboundedly with more and more iterations. Running the exact same case in Fluent converges very quickly, so I assume there is something I am overlooking in OpenFoam as I set up my case. If anyone has any insight as to what might cause this problem, I'd really appreciate your help. Thanks! Greg Z.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Simulation of pressure-driven flow in microchannel	Jeremy	FLUENT	2	December 11, 2017 08:52
Pressure driven laminar flow simpleFoam pressure higher at the outlet than inlet	gabriel	OpenFOAM Running, Solving & CFD	16	September 30, 2009 19:20
pressure BC in buoynacy driven flow	Sasha	FLUENT	3	October 11, 2006 11:08
the Pressure Driven Flow	Q. Hao	FLUENT	0	June 13, 2005 15:30
pressure driven flow by pressure correction method	justentered	Main CFD Forum	0	December 30, 2003 00:52

July 2, 2013, 15:23		#2
Tensian Senior Member James Join Date: May 2013 Posts: 116 Rep Power: 13	Hi Greg, I have the same problem. Have you solved it? Thanks.