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Forum: OpenFOAM Running, Solving & CFD

April 13, 2012, 07:59

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi Senpatras, Are you sure there is no...

Hi Senpatras,

Are you sure there is no influence fixing the matchTolerance to 2, from the preset value of 1e-4 (4 orders magnitudes are quite a lot ....) ?
In an other word, is your periodic BC...

Forum: OpenFOAM Running, Solving & CFD

April 5, 2012, 02:06

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

I don't know how you've generate your mesh but,...

I don't know how you've generate your mesh but, there is somewhere in the forum a blockMesh file to do simple pipe configuration (butterfly mesh).
In this case it is really easy to modify the...

Forum: OpenFOAM Running, Solving & CFD

March 30, 2012, 07:53

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Senpatras, As already mention by Florian,...

Senpatras,

As already mention by Florian, for a LES simulation, y+ should be less than 1 and 3 cells within the viscous layer is really the minimum.
If your mesh is too coarse, you will...

Forum: OpenFOAM Running, Solving & CFD

May 4, 2008, 06:40

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Good morning OpenFOAMers, I

Good morning OpenFOAMers,

I over pass the previous problem. Here is the method :
I haven't tryed to use mapfield anymore and I started from a perturbed parabolic profile (perturbU) :o) so,...

Forum: OpenFOAM Running, Solving & CFD

February 25, 2008, 10:06

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi, I've got questions abou

Hi,

I've got questions about perturbU parameter to initialise a periodic LES pipe flow.
I'd like to know if someone try to do that. I did a first try with a 10% variation, and perturbations...

Forum: OpenFOAM Running, Solving & CFD

January 8, 2008, 04:20

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi John, In perturbU, the y

Hi John,

In perturbU, the y component is the wallReflection vectors.
if you look at the code from Eugene or the main article of this method (Schoppa & Hussain, "Coherent structure dynamics in...

Forum: OpenFOAM Running, Solving & CFD

October 4, 2007, 09:15

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi all, I am doing calculatio

Hi all,
I am doing calculation with periodic channel which is working well.
Now, I try to do the same thing with a periodic pipe. I use a mesh from Gambit and createPatch to make cyclic boundary...

Forum: OpenFOAM Running, Solving & CFD

July 9, 2007, 09:50

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi Eugene, Yes, I plan to sup

Hi Eugene,
Yes, I plan to superimpose on my inlet profile a noise to my laminar inlet.
I notice that the initial law in your PerturbU is for channel (Schoppa & Hussain) so I want to test it to my...

Forum: OpenFOAM Running, Solving & CFD

July 5, 2007, 05:17

Replies: 68

LES turbulent pipe flow

Views: 30,838

Posted By cedric_duprat

Hi all, questions about the u

Hi all,
questions about the upper perturbU from Eugene.
what is the wallDistReflexion to define yDir?
it means the wall normal direction (because X is streamwise direction), with the (.n()) ? ...

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