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Search took 0.00 seconds. Search: Posts Made By: dmoroian
Forum: OpenFOAM Running, Solving & CFD April 8, 2008, 02:52
Replies: 49
Views: 6,885
Posted By dmoroian
Very interesting questions, an

Very interesting questions, and I have to say 'I don't know the complete answers'. I checked what the makeMesh script does and here is what I understood:
m4 <constant/polymesh/blockmeshdict.m4>...
Forum: OpenFOAM Running, Solving & CFD April 7, 2008, 06:04
Replies: 49
Views: 6,885
Posted By dmoroian
It is normal to set zeroGradie

It is normal to set zeroGradient for k and epsilon at walls, since you are using standard k-epsilon turbulence modeling. Divergent solution means that you should start from a better initial solution....
Forum: OpenFOAM Running, Solving & CFD April 7, 2008, 03:54
Replies: 49
Views: 6,885
Posted By dmoroian
Hi Wayne, Maybe I did not und

Hi Wayne,
Maybe I did not understand the MRFSimpleFoam solver very well, but I think you should set up the case in a different way.
First of all, in MRFZones I think you should specify the...
Forum: OpenFOAM Running, Solving & CFD April 7, 2008, 01:47
Replies: 49
Views: 6,885
Posted By dmoroian
No you don't have to impose th

No you don't have to impose the velocity on the rotating wall. You just specify a normal wall "fixedValue" condition. If it is inside the rotating zone, then it will now how to impose the velocity...
Forum: OpenFOAM Running, Solving & CFD April 4, 2008, 07:15
Replies: 49
Views: 6,885
Posted By dmoroian
This is why I want to see your

This is why I want to see your dictionary, because my impression is that you have a rotation axis defined as
axis axis [0 0 0 0 0 0 0] (0 0 1);
in foam. So please post it when you will...
Forum: OpenFOAM Running, Solving & CFD April 3, 2008, 10:42
Replies: 49
Views: 6,885
Posted By dmoroian
Can you display the MRFZones d

Can you display the MRFZones dictionary here?
Forum: OpenFOAM Running, Solving & CFD April 3, 2008, 05:57
Replies: 49
Views: 6,885
Posted By dmoroian
I still think the impeller in

I still think the impeller in foam computation spins in opposite direction to the one in cfx.
foam: +0z
cfx: -0z

Most likely this is due to the fact that you did not impose rotation on the...
Forum: OpenFOAM Running, Solving & CFD April 3, 2008, 04:11
Replies: 49
Views: 6,885
Posted By dmoroian
I agree something is strange i

I agree something is strange in picture a and b. It looks like you are rotating the impeller in opposite direction to the one presented from cfx. However, what you show in a and b cannot be relative...
Forum: OpenFOAM Running, Solving & CFD April 3, 2008, 03:49
Replies: 49
Views: 6,885
Posted By dmoroian
http://www.cfd-online.com/Open

http://www.cfd-online.com/OpenFOAM_Discus/clipart/happy.gif Lots of tries!
Well in the picture I can see, the vectors look ok to me!
Be careful to have pictures with dimensions of less than 50kb....
Forum: OpenFOAM Running, Solving & CFD April 3, 2008, 01:09
Replies: 49
Views: 6,885
Posted By dmoroian
well Wayne, if it is like that

well Wayne, if it is like that I agree with you: it is strange.
Can you post a picture with an example?

Dragos
Forum: OpenFOAM Running, Solving & CFD April 2, 2008, 04:40
Replies: 49
Views: 6,885
Posted By dmoroian
Hi Wayne, This is exactly wha

Hi Wayne,
This is exactly what it is written in the momentum predictor:


tmp<fvvectormatrix> UEqn
(
<blockquote>fvm::div(phi, U)
+...
Forum: OpenFOAM Running, Solving & CFD April 2, 2008, 02:22
Replies: 49
Views: 6,885
Posted By dmoroian
I had a vague memory in the ba

I had a vague memory in the back of my mind when I wrote the above post, but I've just dug for it and here it is...

In the absolute velocity formulation and for a steadily rotating frame the...
Forum: OpenFOAM Running, Solving & CFD April 1, 2008, 07:13
Replies: 49
Views: 6,885
Posted By dmoroian
...and mesh_.V() retuns the ce

...and mesh_.V() retuns the cell volume
Forum: OpenFOAM Running, Solving & CFD April 1, 2008, 07:12
Replies: 49
Views: 6,885
Posted By dmoroian
Hi Wayne, I think that in an

Hi Wayne,
I think that in an absolute velocity formulation, the Coriolis force (2rwxU_relative) and centripet force (rwxwxr) can be written as: rwxU

I hope this is helpful,
Dragos
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