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Forum: OpenFOAM Running, Solving & CFD

March 7, 2007, 08:13

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Yup. Put zero gradient on the

Yup. Put zero gradient on the pressure and the continuity error will go away. The fixed gradient b.c. gives you additional flux which is not accounted for in the continuity equation.

Hrv

Forum: OpenFOAM Running, Solving & CFD

March 7, 2007, 07:45

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Yes. Check your boundary cond

Yes. Check your boundary condition on that additional inlet. My guess is that you have specified both the pressure and the velocity at the boundary, which will give you a continuity error.

Let...

Forum: OpenFOAM Running, Solving & CFD

January 20, 2006, 13:16

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Better, huh? :-) How much w

Better, huh? :-)

How much work does the AMG do? I think you're in business now...

Good luck,

Hrv

Forum: OpenFOAM Running, Solving & CFD

January 20, 2006, 08:24

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Try: Gauss linear limited 1

Try:

Gauss linear limited 1;

p AMG 1e-06 0 100;

(the last number is the number of equations on the top level)

The mesh is good, looks like the CG is struggling a bit. I am...

Forum: OpenFOAM Running, Solving & CFD

January 20, 2006, 07:23

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Hehe, a perfect candidate :-)

Hehe, a perfect candidate :-)

The time of simulation is all spent in the pressure solver, which is doing way too many iterations (6 times 800). Secondly, it looks like the non-orthogonal...

Forum: OpenFOAM Running, Solving & CFD

January 19, 2006, 04:22

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

Hi Anja, It sounds to me as

Hi Anja,

It sounds to me as if you need to tune the solver. For a steady-state laminar flow, I would use simpleFoam with the "laminar" turbulence model. You can then play around with...

Forum: OpenFOAM Running, Solving & CFD

January 18, 2006, 09:41

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

This does not worry me at all:

This does not worry me at all: it says your global continuity error is 1e-14, which is the double precision round-off error, the sum local tells me that in the line above your pressure solver has...

Forum: OpenFOAM Running, Solving & CFD

January 18, 2006, 09:23

Replies: 37

Time step continuity

Views: 28,395

Posted By hjasak

How big are they? They are rel

How big are they? They are related to the pressure solver tolerance and you should be able to squeeze them by converging the pressure more tightly. If this doesn't work, you've probably messed up...

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