simplefoam-too high velocity at oulet --> Crash

Specialist · August 20, 2014, 15:17

Hey together,

I try to simulate a constant flow through a complex pipe with simpleFoam. My simulation crashes by any kind of outlet boundary condition.
The principle is every time the same:After the first interations ,the air flows back in the pipe with a high velocity and crashes the simulation. I used all known BC like the U-File:
- zeroGradient
-inletoutlet, if I use this with uniform 0, there is neither and inflow nor an outflow at then oulet
-fluccorrctedvelocity

The pressure file keeps untouched:
fixed value zero

Do you have any idea, why is does not work?

Thanks!

RodriguezFatz · August 21, 2014, 02:48

1) What other b.c. do you use?
2) What turbulence model (+b.c.) do you use?
3) How dou you initialize the simulation
4) Can you post a picture of the domain?

August 20, 2014, 15:17	simplefoam-too high velocity at oulet --> Crash	#1
Specialist New Member Join Date: Jul 2014 Posts: 17 Rep Power: 11	Hey together, I try to simulate a constant flow through a complex pipe with simpleFoam. My simulation crashes by any kind of outlet boundary condition. The principle is every time the same:After the first interations ,the air flows back in the pipe with a high velocity and crashes the simulation. I used all known BC like the U-File: - zeroGradient -inletoutlet, if I use this with uniform 0, there is neither and inflow nor an outflow at then oulet -fluccorrctedvelocity The pressure file keeps untouched: fixed value zero Do you have any idea, why is does not work? Thanks!

August 21, 2014, 02:48		#2
RodriguezFatz Senior Member Philipp Join Date: Jun 2011 Location: Germany Posts: 1,297 Rep Power: 26	1) What other b.c. do you use? 2) What turbulence model (+b.c.) do you use? 3) How dou you initialize the simulation 4) Can you post a picture of the domain? __________________ The skeleton ran out of shampoo in the shower.

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