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Velocity Split in Domain for Larger Simulations

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Old   November 15, 2021, 15:19
Post Velocity Split in Domain for Larger Simulations
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PJoynt
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Hi All,


I was wondering if anyone has experienced or might have an explanation for why when viewing x-velocity (or velocity mag.), there is a split / delineation in the middle of the domain? I haven't experienced this for domains that are smaller and I have tried the different domain decomposition options but that doesn't seem to resolve the issue.


The domain is relatively large at 235m in x, 125m in y, and 20m in z. The control files are attached.


Cheers,
Patrick
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File Type: jpg VelocityX_Result.jpg (28.7 KB, 25 views)
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File Type: txt ctrl.txt (281 Bytes, 7 views)
File Type: txt control.txt (232 Bytes, 5 views)
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Old   November 16, 2021, 05:08
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Arun Kamath
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Looks like an artefact from Paraview visualisation at the boundary of parallel processors?
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Old   November 16, 2021, 08:33
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I've tried paraview 5.09 and 5.10.0-RC1 and seem to have the same problem... I'll have to try some other versions.
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Old   November 16, 2021, 08:39
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Well looks like there was a bug resulting in air turbulence damping applied only to proc 0. That resulted in the difference in velocity seen at the processor boundary. This is now fixed.
Please download the latest RC and let us know if the problem persists.
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Old   November 16, 2021, 08:47
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Hi Patrick,

thanks for the feedback! This is a bug in the use of T 32, leading to different eddy-viscosity in different parts of the domain. I have fixed this in the RC, and it will be fixed in the next master.
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Old   November 16, 2021, 08:58
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Quote:
Originally Posted by valgrinda View Post
Hi Patrick,

thanks for the feedback! This is a bug in the use of T 32, leading to different eddy-viscosity in different parts of the domain. I have fixed this in the RC, and it will be fixed in the next master.
Much appreciated Prof. Bihs!
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