Help with pimpleFoam

fcortes · February 8, 2011, 07:37

Hello everyone,

I’m using pimpleFoam to simulate a 3D flow on a very small irregular tube (total volume around 2e-7; 150000 elements (tetrahedral)). I’ve used the files of T-junction tutorial as a base. I’m also using GroovyBC to make the pulsatile velocity with a parabolic profile at the inlet and the pressure at the outlet. Turbulence model is a RAS kOmega and the fluid is Newtonian.

I’ve achieved convergence with pulses with top inlet velocity around 0.6 (Re=450). The minimum time step then was 1.8e-5. The problem is that I can’t achieve convergence with higher inlet velocities (Re=650 to 800). I’ve tried a lot of combinations of correctors (1 to 4), nonOrthogonalCorrectors (1 to 4), outerCorrectos (1 to 4), maxCo (1 to 0.5) and relaxation factors (1 to 0.05). I always get a blowout close to the top velocity but sometimes at a velocity lower than the top velocity of the case that worked, which to me is very weird.

If someone knows what I can do to solve this (or needs more info to do so) please let me know.
Thanks in advance!

Francisco

1988 · June 26, 2014, 10:46

Hello Fransisco
I have ctuck in a problem the same as yours ,did you find an answer?
please help me tanks

fcortes · June 26, 2014, 12:31

Nop, I ended up simulating those cases in fluent.
Good luck!

February 8, 2011, 07:37	Help with pimpleFoam	#1
fcortes New Member Francisco Cortés Join Date: Sep 2010 Location: Santiago, Chile Posts: 7 Rep Power: 16	Hello everyone, I’m using pimpleFoam to simulate a 3D flow on a very small irregular tube (total volume around 2e-7; 150000 elements (tetrahedral)). I’ve used the files of T-junction tutorial as a base. I’m also using GroovyBC to make the pulsatile velocity with a parabolic profile at the inlet and the pressure at the outlet. Turbulence model is a RAS kOmega and the fluid is Newtonian. I’ve achieved convergence with pulses with top inlet velocity around 0.6 (Re=450). The minimum time step then was 1.8e-5. The problem is that I can’t achieve convergence with higher inlet velocities (Re=650 to 800). I’ve tried a lot of combinations of correctors (1 to 4), nonOrthogonalCorrectors (1 to 4), outerCorrectos (1 to 4), maxCo (1 to 0.5) and relaxation factors (1 to 0.05). I always get a blowout close to the top velocity but sometimes at a velocity lower than the top velocity of the case that worked, which to me is very weird. If someone knows what I can do to solve this (or needs more info to do so) please let me know. Thanks in advance! Francisco

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June 26, 2014, 10:46		#2
1988 Senior Member Ali reza Join Date: Mar 2014 Posts: 110 Rep Power: 12	Hello Fransisco I have ctuck in a problem the same as yours ,did you find an answer? please help me tanks

June 26, 2014, 12:31		#3
fcortes New Member Francisco Cortés Join Date: Sep 2010 Location: Santiago, Chile Posts: 7 Rep Power: 16	Nop, I ended up simulating those cases in fluent. Good luck!