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Forum: OpenFOAM Running, Solving & CFD

April 21, 2011, 05:01

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Take a look at how rho*g*h is defined in the code...

Take a look at how rho*g*h is defined in the code (createFields.H, line 109).

Forum: OpenFOAM Running, Solving & CFD

April 20, 2011, 21:58

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Right. Just set a uniform value at the outlet....

Right. Just set a uniform value at the outlet. Using p_rgh makes actually things a bit simpler in these cases ;-)

Forum: OpenFOAM Running, Solving & CFD

April 19, 2011, 20:08

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Just remember the definition of p and p_rgh...

Just remember the definition of p and p_rgh...

Forum: OpenFOAM Running, Solving & CFD

April 15, 2011, 00:17

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Correctors on alpha only affect the evaluation of...

Correctors on alpha only affect the evaluation of alpha, not the alpha-U-p coupling, which is left to the PISO loop.

Symptoms of insufficient correctors are a not accurate solution for alpha. Try...

Forum: OpenFOAM Running, Solving & CFD

April 14, 2011, 16:24

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

I would say that at least 2 sub-cycles are...

I would say that at least 2 sub-cycles are recommended, but it depends on the application. See the tutorials: with Co = 0.2, correctors are in the 2-4 range.

Best,

Forum: OpenFOAM Running, Solving & CFD

April 13, 2011, 14:53

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Hi, the problem is not in the top BC, but you...

Hi, the problem is not in the top BC, but you were setting the same pressure BC at the outlet, which is not true, since the top could be atmospheric (I set it to a wall as they say in the link of...

Forum: OpenFOAM Running, Solving & CFD

April 12, 2011, 22:13

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

Hi, I ran your case, and made some changes...

Hi,

I ran your case, and made some changes to it. In particular, the original case sets the top to a wall, and the side on the oulet as Neumann condition. I fixed the mesh to do that.

The top...

Forum: OpenFOAM Running, Solving & CFD

April 11, 2011, 20:59

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

OK. Could you share your case? P.S. I saw...

OK. Could you share your case?

P.S. I saw you are not solving the momentum predictor. Turn that on too. Additionally, you might want to check if residuals are actually converging.

Forum: OpenFOAM Running, Solving & CFD

April 11, 2011, 11:59

Replies: 22

problem getting interFoam to behave

Views: 5,960

Posted By alberto

It looks like the solution is becoming unstable....

It looks like the solution is becoming unstable. It would be useful to know what numerical setup you are using (fvSchemes). If you took it from tutorials, change the div scheme for U from "linear" to...

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