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Forum: OpenFOAM Running, Solving & CFD

July 2, 2010, 04:18

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Jérémy: Unfortunately, EASM models are not...

Jérémy: Unfortunately, EASM models are not currently available in OF. But the RSM seems a good idea for your case.

Thomas: This is what I get for a channel flow (cyclic BC) (U,V,p).

If you...

Forum: OpenFOAM Running, Solving & CFD

June 30, 2010, 03:58

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Hi Thomas, I have results for a planar...

Hi Thomas,

I have results for a planar channel flow using an EASM.
In my simulation the V-velocity is zero and the pressure is constant across the channel.

Can you confirm that the initial...

Forum: OpenFOAM Running, Solving & CFD

June 21, 2010, 05:59

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Hi I am using the same appraoch as it is...

Hi

I am using the same appraoch as it is used in the other non-linear models, i.e.
divDevReff =
fvc::div(nonLinearStress_)
- fvm::laplacian(nuEff(), U)
-...

Forum: OpenFOAM Running, Solving & CFD

June 18, 2010, 05:51

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Hi Thomas, how is the convergence of the...

Hi Thomas,

how is the convergence of the EASM model? How many mangnitudes do the residuals drop? I found that EASM sometimes dont convergence very well which may also results in some kind of...

Forum: OpenFOAM Running, Solving & CFD

April 27, 2010, 10:45

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

HI Thomas, I am glad to hear the rotation is...

HI Thomas,

I am glad to hear the rotation is correct now.

Why dont you just use the same kEps formulation which Wallin&Johansson have used. If I remember correctly, it should allow for an...

Forum: OpenFOAM Running, Solving & CFD

April 21, 2010, 08:15

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

I am using the EASM of Wall&Johansson with the...

I am using the EASM of Wall&Johansson with the SSG pressure strain model.
I never had any problems with that model and it also works without damping functions (I am using a omega based formulation)....

Forum: OpenFOAM Running, Solving & CFD

April 21, 2010, 03:59

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Hi Thomas, when I did the sqaure duct the...

Hi Thomas,

when I did the sqaure duct the secondary flow was in the correct direction.
However, the EASM I am using has a (+) sign in front of the (SikSkj -...) term.
Which EASM are you trying...

Forum: OpenFOAM Running, Solving & CFD

April 16, 2010, 09:36

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Hi Thomas, I think I cannot help you much...

Hi Thomas,

I think I cannot help you much here - sounds a little bit like you have swaped a +/- sign somewhere in the nonlinear terms.
Have you validated your model on a case like flat plate or...

Forum: OpenFOAM Running, Solving & CFD

October 29, 2008, 06:10

Replies: 19

Problem with secondary flow in a square duct

Views: 5,144

Posted By cfdmarkus

Dear all I am trying to sim

Dear all

I am trying to simulate the secondary flow in the corners of a fully developed square duct. To capture the secondary flow I am using an EASM turbulence model.

Instead of getting a...

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