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Search: Posts Made By: Bollonga
Forum: FLUENT March 10, 2013, 15:08
Replies: 27
Views: 3,378
Posted By Bollonga
Even if it's converging, CD and CL are far from...

Even if it's converging, CD and CL are far from their correct values. I guess I have to let the simulation run longer. The problem is it's too slow!
I'm simulating the transient case for the 70...
Forum: FLUENT March 10, 2013, 11:54
Replies: 27
Views: 3,378
Posted By Bollonga
Yes, I need to match some test turbulence...

Yes, I need to match some test turbulence conditions.


In the solution controls panel there's the option to modify explicit relaxation factors for momentum and pressure and under-relaxation...
Forum: FLUENT March 10, 2013, 08:18
Replies: 27
Views: 3,378
Posted By Bollonga
It works for me too! You're the man! I've...

It works for me too! You're the man!

I've applied this same setup with k-epsilon Realizable model to the 3D flat plate case with 70 angle of attack I've been dealing with. It's working too! I...
Forum: FLUENT March 9, 2013, 15:35
Replies: 27
Views: 3,378
Posted By Bollonga
How are those curved edges made? Splines curves?

How are those curved edges made? Splines curves?
Forum: FLUENT March 9, 2013, 14:36
Replies: 27
Views: 3,378
Posted By Bollonga
I was asking you some more questions, but having...

I was asking you some more questions, but having cas and dat files is great! However dropbox shows error 404 and doesn't seem to be uploading...:mad:



Under-relax factors an order of magnitud...
Forum: FLUENT March 9, 2013, 13:58
Replies: 27
Views: 3,378
Posted By Bollonga
Which node distribution have you made? ...

Which node distribution have you made?


Which distribution have you let for the z-direction?

Would you mind passing me that mesh files to see how each node distribution is?

Thanks a lot Far!
Forum: FLUENT March 9, 2013, 13:29
Replies: 27
Views: 3,378
Posted By Bollonga
Yes, flow is incompressible. Maybe it takes...

Yes, flow is incompressible.
Maybe it takes longer to reach divergence with the larger domain.


Have you managed to avoid the divergence? How?
Forum: FLUENT March 9, 2013, 12:09
Replies: 27
Views: 3,378
Posted By Bollonga
Angle of attack is 0. Domain is: 10c...

Angle of attack is 0.

Domain is: 10c upwind,10c up, 10c down et 36c downwind. Spanwise the domain is 5c.

I don't know why such a sever divergence from the beginning...
Forum: FLUENT March 9, 2013, 10:55
Replies: 27
Views: 3,378
Posted By Bollonga
Reduced under-relax factor haven't worked for the...

Reduced under-relax factor haven't worked for the steady k-om SST case (see residuals). I'll try with the more viscous fluid.
Forum: FLUENT March 9, 2013, 10:43
Replies: 27
Views: 3,378
Posted By Bollonga
Slip wall is a stationary wall with 0 specifed...

Slip wall is a stationary wall with 0 specifed shear stress, right?
The wing comes form side to side of the domain, so both sides have symmetry BC.
I've made the domain bigger but TVR limitation...
Forum: FLUENT March 9, 2013, 08:25
Replies: 27
Views: 3,378
Posted By Bollonga
The only wall BC is that of the airfoil so I...

The only wall BC is that of the airfoil so I should keep it as non-slip, right?
If I were to simulate the ground, I should use the slip wall condition?
Yes, the model is symmetric.
Forum: FLUENT March 9, 2013, 08:09
Replies: 27
Views: 3,378
Posted By Bollonga
BC at bottom, top and side faces are symmetry....

BC at bottom, top and side faces are symmetry. Inlet face has normal to boundary velocity. Outlet face is pressure outlet.

I've chosen this domain shape for symplicity, the airfoil is just part of...
Forum: FLUENT March 9, 2013, 07:11
Replies: 27
Views: 3,378
Posted By Bollonga
3D Naca wing divergence

Hi you all guys,

I'm working on a 3D naca wing of 1.018 m chord length with 0 angle of attack. You can see the domain extents in picture 1.
I've done an hexa mesh with a min quality of 0.6, min...
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