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Forum: OpenFOAM Running, Solving & CFD December 12, 2007, 23:50
Replies: 45
Views: 7,589
Posted By gtg627e
Rosario, Thank you for your

Rosario,

Thank you for your elucidations on the Spalart-Allmaras model, and the associated method to compute y+.

Now I have a question for you. I have been going crazy with trying to...
Forum: OpenFOAM Running, Solving & CFD December 11, 2007, 21:19
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, I don't know whet

Emanuele,

I don't know whether or not the spalartAllmaras uses wall functions. If it does, you should set zeroGradient for all turbulence variables at the boundary patch ala like you have done....
Forum: OpenFOAM Running, Solving & CFD December 10, 2007, 17:06
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, Could you be more

Emanuele,

Could you be more specific about your turbFoam case:

1. turbulence model
2. checkMesh output and y+
3. Boundary conditions
4. Initial conditions
5. deltaT and Courant...
Forum: OpenFOAM Running, Solving & CFD December 6, 2007, 13:13
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, With aoa = 18 deg

Emanuele,

With aoa = 18 deg, you have massive separation. SimpleFoam, being a steady solver, is not applicable to this case. You should use turbFoam.

For a naca0012, I think you are safe...
Forum: OpenFOAM Running, Solving & CFD December 6, 2007, 12:18
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, Sorry about the c

Emanuele,

Sorry about the chord length;
This is what I mean Re=chord*U/nu; I messed that up in my previous posting.
I see your chord must be 1, right?

Alessandro
Forum: OpenFOAM Running, Solving & CFD December 6, 2007, 12:15
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, What is the chord

Emanuele,

What is the chord length of your airfoil?
To get Re=1e6, given your nu, it looks like the chord is ~ 0.72.

So, the aspect ratio of your faces in the z-direction is very high. ...
Forum: OpenFOAM Running, Solving & CFD December 6, 2007, 10:24
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, The inlet velocit

Emanuele,

The inlet velocity seems very low. What Re are you trying to obtain?
What is your kinematic viscosity?

Also, remember that in liftDrag a value of Aref is computed, which is...
Forum: OpenFOAM Running, Solving & CFD December 5, 2007, 08:41
Replies: 45
Views: 7,589
Posted By gtg627e
Emanuele, At the moment, I

Emanuele,

At the moment, I am experimenting with:

1. kOmegaSST (High-Re) meaning you use wall functions.


2. LaunderSharmaKe (Low-Re) meaning you do not use wall functions.

To...
Forum: OpenFOAM Running, Solving & CFD December 3, 2007, 16:34
Replies: 45
Views: 7,589
Posted By gtg627e
Dear Emanuele, I have been

Dear Emanuele,

I have been working on a naca0012 as well.
These are the things I found out so far:

1. The solution is very very sensitive to your mesh quality. At the moment, I am using...
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