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Bug in turboPerformance for OF-2.3.x?

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Old   July 30, 2014, 03:50
Default Bug in turboPerformance for OF-2.3.x?
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don lenardo
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Hello,

I have tried to use the turboPerformance with OpenFOAM 2.3.x according to this link:

https://github.com/wyldckat/OSIG-Tur...formance-OF2.x

But during steady-state calculation the "Moment" seems to be underestimated. All other OF version (with the appropriate turboPerformance libs) predict significantely different values (relative derivation of more that 80%).

So I suppose that there is a bug in this turboPerformance version or even in OF-2.3.x in combination with steady-state simulations considering rotating frames (simpleFoam and fvOptions).

Has anyone same experiences with this issue?

BR,
MARKUS

Last edited by lentschi; July 30, 2014 at 05:04.
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Old   August 4, 2014, 11:34
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Bruno Santos
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Greetings Markus,

Sorry about that. I really only took care of making it build. I didn't have much time to figure out how exactly things work and to double check if tutorials were running properly with each version of OpenFOAM or not.

If you can provide more details on how I can reproduce the same error and indicate what I should look at, as well as where there are problems in the results, I should be able to have a better look into this and try to fix the problem.
Otherwise, I won't even know where to start looking at and might end up never seeing the same problem you're seeing.

Best regards,
Bruno
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Old   August 24, 2014, 04:53
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Steve C
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I also have been interested in the turboPerformance libraries for OF2.2/2.3. I've been using turboPerformance with 1.6-ext for a while, but have recently trialed Bruno's turboPerformance port for 2.2.2 and 2.3.

In my (single) trial to date, results between 1.6-ext, 2.2 and 2.3 with turboPerformance seem pretty close. This is for an axial fan case using simpleFoam & MRF. For example, typical numbers are as follows. First number for 1.6-ext, second for 2.2.2, 3rd for 2.3.

Code:
OF Version                  1.6-ext   2.2.2    2.3
Inlet velocity average      1.694     1.685    1.652
Outlet velocity average     9.674     9.630    9.441
Head                        22.862    22.843   23.027
Tomega                      1150      1143     1130
Efficiency                  69.89     69.94    69.88
Blade axial force           56.262    55.672   55.751
Shaft moment                6.230     6.420    6.130
This is by no means a rigorous comparison, not the least because each of the runs was terminated at a reasonably-converged (as judged by variation in the above parameters) but not consistent point. There is a variation between the codes, but not enough for me to think that something is drastically wrong with 2.2.2 & 2.3 implementation at this point.

Of course, there may still be an issue with the libraries, and I've just been lucky enough not to stumble across it yet.

It's reasonably early days for me with turboPerformance & OF2.2.2/2.3, but just wanted to add another data point to the discussion.

Regards
Steve
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