Forum: OpenFOAM Running, Solving & CFD
March 30, 2009, 13:14
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Replies: 44
Views: 5,959
Hi, Santos,
The expression of different...
Hi, Santos,
The expression of different analytical solutions for sphere case is in my Vista system. I will email you tonight. Please accept it from Italy :)
Best regards,
Bin
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Forum: OpenFOAM Running, Solving & CFD
March 29, 2009, 11:18
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Replies: 44
Views: 5,959
Hi Santos,
That's great to hear from you. I...
Hi Santos,
That's great to hear from you. I think your computational domain will be smaller than mine. (maybe there will be difference for the influence from cylinder and from sphere).
I have...
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Forum: OpenFOAM Running, Solving & CFD
March 27, 2009, 02:04
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Replies: 44
Views: 5,959
Hi, Mr. McGlashan,
I have read your post in...
Hi, Mr. McGlashan,
I have read your post in the above post. I'm lucky we are on the same boat :)
Recently I have tried to use grading mesh around the the cylinder, after I take a look at these...
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Forum: OpenFOAM Running, Solving & CFD
March 20, 2009, 18:01
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Replies: 44
Views: 5,959
Hi Lin,
Thank you for your advice.
I am...
Hi Lin,
Thank you for your advice.
I am generating and checking again the mesh quality very carefully with blockMesh. Your suggestion of "More grid around the cylinder" is reasonable. although...
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Forum: OpenFOAM Running, Solving & CFD
March 20, 2009, 10:17
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Replies: 44
Views: 5,959
One question to myself: is symmetry boundary...
One question to myself: is symmetry boundary condition on the top of the computational domain is right? Is it because of this boundary condition that my simulation does not converge?(But if I...
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Forum: OpenFOAM Running, Solving & CFD
March 20, 2009, 04:52
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Replies: 44
Views: 5,959
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 14:47
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Replies: 44
Views: 5,959
Dear all,
Today Mr. Santos pointed out that...
Dear all,
Today Mr. Santos pointed out that there maybe something wrong in my mesh, and he is right. Thank you.
Why I made such a mistake using blockMesh?
I follow the equation of U-38,...
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 11:18
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Replies: 44
Views: 5,959
Hi McGlashan,
Thank you for your...
Hi McGlashan,
Thank you for your suggestions. As you said, we should rely on the stability of the parameters (u, or p) at some sampling positions. Also when we increase the deltaT, we can find...
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Forum: OpenFOAM Running, Solving & CFD
March 16, 2009, 01:55
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Replies: 44
Views: 5,959
Dear Foamers,
This is a very nice platform....
Dear Foamers,
This is a very nice platform. OpenFOAM becomes so nice. Thank you, organizers.
As for my uniform flow around a cylinder, the cylinder radius is 1 micrometer, while upstream,...
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Forum: OpenFOAM Running, Solving & CFD
March 15, 2009, 08:37
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Replies: 44
Views: 5,959
Hello,
I know that fvc::div
Hello,
I know that fvc::div(nuEff()*dev(fvc::grad(U)().T()) =1/3*nuEff()*grad(div(U)), when it is incompressible flow, it equals to 0.
Now my problem about why it does not converge goes to:...
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Forum: OpenFOAM Running, Solving & CFD
March 15, 2009, 06:10
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Replies: 44
Views: 5,959
Dear all,
Can I ask one que
Dear all,
Can I ask one question about simpleFoam solver:
when I set in the file constant/RASProperties:
RASModel laminar
turbulence off;
what will be...
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Forum: OpenFOAM Running, Solving & CFD
March 14, 2009, 05:20
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Replies: 44
Views: 5,959
Hi Hua Zen,
Really apprecia
Hi Hua Zen,
Really appreciate that you follow my post and give me some good suggestions.
I will try to play around the "tolerance", "relTol" and "other scheme", in order to get converged...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 10:55
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Replies: 44
Views: 5,959
Hi Hua Zen and Niels,
Thank
Hi Hua Zen and Niels,
Thank you for your suggestions.
As for "using higher order scheme than upwind"and "change the tolerance of U", I have made the following modification in fvSchemes and...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 06:14
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Replies: 44
Views: 5,959
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 05:31
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Replies: 44
Views: 5,959
Hi,Hua Zen,
Thank you very
Hi,Hua Zen,
Thank you very much for your input. Now let me answer your questions:
1.Since you do not mention your fvscheme and fvsolution file.I don't know the detail.Try use higher order...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 04:29
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Replies: 44
Views: 5,959
Hi David,
Thank you for sha
Hi David,
Thank you for sharing this knowledge.
I can not get that pdf paper now, would you mind if I ask you to help me, send that paper to: zhoubinwx at hotmail.com?
I will...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 03:53
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Replies: 44
Views: 5,959
Dear OpenFOAM friends:
As w
Dear OpenFOAM friends:
As we know, at low Re number flow, the effect of the body extends far away, especially for cylinder.
I make a simulation for a cylinder with radius 1m, but with...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 02:36
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Replies: 44
Views: 5,959
Dear readers:
My conclusion
Dear readers:
My conclusion of my post "Friday, March 13, 2009 - 12:17 am" has a mistake.
I could not conclude so rudely. simpleFoam is useful for my extreme low Re case.
I will...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 01:31
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Replies: 44
Views: 5,959
Hi Niels,
Feel excited to s
Hi Niels,
Feel excited to see your reply to me http://www.cfd-online.com/OpenFOAM_Discus/clipart/happy.gif How are you recently?
You are right, there is so called Stokes' paradox for this...
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Forum: OpenFOAM Running, Solving & CFD
March 13, 2009, 01:17
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Replies: 44
Views: 5,959
Hi,Hua Zen,
First of all, t
Hi,Hua Zen,
First of all, thank you very much for your immediate response.
You are right, I am not bothered by the turbulence, and I am lucky at this point.
Let me answer for your...
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Forum: OpenFOAM Running, Solving & CFD
March 12, 2009, 17:01
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Replies: 44
Views: 5,959
I have proved that when Re: 0.
I have proved that when Re: 0.5~20, OpenFOAM get very close Cd when compared with analytical results, as well as experiments.
Then, what's wrong with Re:0.001~0.1?
I ask myself....
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Forum: OpenFOAM Running, Solving & CFD
March 9, 2009, 14:44
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Replies: 44
Views: 5,959
Hi Hua Zen,
Thank you for y
Hi Hua Zen,
Thank you for your attention and your suggestion.
When I use blockMesh and scale my computational domain, Cd is the same.
However, this problem is still under study,...
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Forum: OpenFOAM Running, Solving & CFD
March 8, 2009, 03:08
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Replies: 44
Views: 5,959
Hi Jon,
You are right, I ha
Hi Jon,
You are right, I have proved your suggestions: even though Re=u*d/miu seems the same in these three cases, if we do not scale the computational domain, Cd will be different (Re is not...
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Forum: OpenFOAM Running, Solving & CFD
March 7, 2009, 07:34
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Replies: 44
Views: 5,959
Hi Jon,
Thank you for your
Hi Jon,
Thank you for your reply.
I will try to do as you suggested and report my results here.
BTW, Adi, I will send you my test case to you after I have results from Mr.Joh's advice....
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Forum: OpenFOAM Running, Solving & CFD
March 6, 2009, 17:25
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Replies: 44
Views: 5,959
Dear all,
I know that I get
Dear all,
I know that I get three different answers for the same Reynolds number is disturbing.
I would like to give all the detailed information if some of you are interested. Anyway, our...
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