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Forum: OpenFOAM Running, Solving & CFD

April 8, 2014, 15:02

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

I don't think I have used that option, I just use...

I don't think I have used that option, I just use "-O2 -no-prec-div", of cause I tried "-O3" as well.

Well, I am not ready to piss them off :). But I don't see a reason that our cluster...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2014, 11:14

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

OOPS, can anyone verify by running a small test...

OOPS, can anyone verify by running a small test on your computer.

Copy the cavity case from your tutorial and refine the mesh to 1000*1000*1, change deltaT to 2e-5 and endtime to 1e-3, and keep...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2014, 11:06

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

(1) decomposition method scotch, but I have tried...

(1) decomposition method scotch, but I have tried simple with (32*1*1) and the final residuals are still different.

(2) 4 core: it is on my personal workstation. 16-core it's running on a high...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2014, 10:54

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

It is exactly the same case copied from the...

It is exactly the same case copied from the tutorial icoFoam cavity. The only difference is the original mesh is 20*20, now I refine it to 1000*1000. The fvScheme settings are also the same. Boundary...

Forum: OpenFOAM Running, Solving & CFD

April 8, 2014, 10:05

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

I've never had success in using PCG solver in...

I've never had success in using PCG solver in parallel, it blows always.

Using a smaller rolerance, p 1.0e-6, U 1.0e-5, as you can see below, the number of iterations has not exceed the maximum...

Forum: OpenFOAM Running, Solving & CFD

April 7, 2014, 17:51

Replies: 10

Same case run twice I got different results, what's going wrong?

Views: 1,810

Posted By lakeat

Same case run twice I got different results, what's going wrong?

I ran a cavity case with icoFoam in parallel using 32 cores (i.e. two nodes) twice, but I got different results. By saying "different", I mean the log file shows residual difference.

log-1:

...

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