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IDProjectCategoryView StatusDate SubmittedLast Update
0000625OpenFOAM[All Projects] Bugpublic2012-08-15 11:582012-09-06 09:11
ReportermaHein 
Assigned Tohenry 
PrioritynormalSeveritymajorReproducibilityalways
StatusclosedResolutionno change required 
PlatformLinuxOSDebianOS Version6.0
Product Version2.1.x 
Target VersionFixed in Version 
Summary0000625: conjugate heat transfer - unequal temperature at coupled patches
DescriptionThe temperature fields at a coupled boundary patch do not match the temperature field of the adjacent coupled boundary patch of another mesh region. Both patches are defined as "mappedWall" with the "compressible::turbulentTemperatureCoupledBaffleMixed" boundary condition.
Steps To ReproduceLook at the following tutorial test case:

$FOAM_TUTORIALS/heatTransfer/chtMultiRegionFoam/multiRegionLiquidHeater

Use the Allrun script and compare the following temperature patch fields using Paraview:

bottomWater_to_heater <---> heater_to_bottomWater
rightSolid_to_topAir <---> topAir_to_rightSolid
heater_to_topAir <---> topAir_to_heater

The temperature distribution matches in none of these cases. I also tried the other CHT tutorials, same behaviour.
TagsNo tags attached.
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-  Notes
(0001614)
mattijs (manager)
2012-08-20 07:48

The coupling in chtMultiRegion*Foam is explicit, i.e. it uses uptodate coefficients on either side when evaluating the coupled boundary condition. Only upon convergence will the temperatures/fluxes be equal.
(0001672)
zj87 (reporter)
2012-09-06 06:59

what do you mean of 'upon convergence'?Do you mean upon the tolerance ?Is it enough to upon the tolerance of T only?
(0001673)
mattijs (manager)
2012-09-06 08:09

No, the whole system should be converged. Heat transfer is affected by local properties. E.g. heat transfer coefficient depends on turbulence which depends on the flow. Note that the multiRegionHeater tutorials are simplified cases and might not even be steady.
(0001674)
maHein (reporter)
2012-09-06 08:15
edited on: 2012-09-06 08:15

The reason for the unequal distribution was due to some odd behaviour of the reader plugin in paraview. The actual temperature fields were correct, but not correct displayed. Using another version of paraview, all CHT temperature fields match perfectly.

This bug report can be closed.


- Issue History
Date Modified Username Field Change
2012-08-15 11:58 maHein New Issue
2012-08-20 07:48 mattijs Note Added: 0001614
2012-09-06 06:59 zj87 Note Added: 0001672
2012-09-06 08:09 mattijs Note Added: 0001673
2012-09-06 08:15 maHein Note Added: 0001674
2012-09-06 08:15 maHein Note Edited: 0001674 View Revisions
2012-09-06 09:11 henry Status new => closed
2012-09-06 09:11 henry Assigned To => henry
2012-09-06 09:11 henry Resolution open => no change required