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|ID||Project||Category||View Status||Date Submitted||Last Update|
|0001704||OpenFOAM||[All Projects] Bug||public||2015-05-22 13:24||2015-05-25 17:36|
|Fixed in Version|
|Summary||0001704: externalWallHeatFluxTemperature BC makes the solver crash when Qr is added to the balance|
|Description||After trying to solve some cases with buoyantSimpleFoam and chtMultiRegionSImpleFOam using this BC with the option of adding Qr to the balance I never got any other solution than a crash. After an intensive analysis (http://www.cfd-online.com/Forums/openfoam-solving/143632-problems-adding-qr-field-externalwallheatfluxtemperature-bc.html#post547223) I found out that the problem was that when Qr is added to the balance it makes refValue() get negative values in the first iterations. |
In order to solve this problem I tried to implement a relaxation factor for Qr like it is done in thermalBaffle1D BC with hopeful results. The solver converged with a relaxation factor of 0.1.
I attached a case where the problem can be tested, it is a modified version of the tutorial case "circuitBoardCooling". Here (http://www.cfd-online.com/Forums/openfoam-bugs/153082-thermalbaffle1d-showing-bad-behavior.html#post546783) its changes are explained in order to see the crash.
|Steps To Reproduce||execute ./Allrun script|
The solver should hopefully crash after 16th timestep.
|Tags||No tags attached.|
circuitBoardCooling_rad.zip (36,617 bytes)
myExternalWallHeatFluxTemperatureFvPatchScalarField.C (11,979 bytes)
||I forgot to mention that Qr option is not activated by default in the case attached. It must be activated in the "0.org/T" file.|
I have added relaxation of the radiative contribution to the externalWallHeatFluxTemperature BC as requested but I am unable to run your case with or without this change:
Starting time loop
Time = 1
DILUPBiCG: Solving for h, Initial residual = nan, Final residual = nan, No Iterations 1001
Radiation solver iter: 0
Also your case has a lot of external dependencies which are not provided with OpenFOAM which makes it difficult to test.
Please test the change yourself to ensure the relaxation operates as you expect.
commit 24059d8139ef946984e7f262ba1272366e4daf5f in OpenFOAM-2.4.x
Sorry Henry, but I don't understand what you mean with external dependencies, I only took a tutorial case and modified its boundary conditions using other ones provided with OpenFOAM. Besides that I just realized that I used some functions and libraries in controlDict that maybe are causing your troubles. This is the only thing I think that can cause a trouble... I apologize for that, I only added these functions to check the energy balance and I forgot to remove it when I uploaded here.
I see you only applied the change in OF v2.4.x , may you apply it to v2.3.x too? This the version I'm using at the moment and I'm not going to install 2.4.x for now.
Btw, I just checked the modifications and I think that some lines are wrong, these are lines 219-220 and this is how I think they should look:
+ QrPrevious_(ptf.QrPrevious_), ---> QrPrevious_(tppsf.QrPrevious_), //219
+ QrRelaxation_(ptf.QrRelaxation_), ---> QrRelaxation_(tppsf.QrRelaxation_), //220
Many thanks for applying the changes in order to solve this issue.
Just a quick note on how to apply the relevant commit on 2.3.x manually:
patch -p1 < 24059d8139ef946984e7f262ba1272366e4daf5f.patch
||Sorry about the compilation error; juggling too many things. I have pushed the fix to OpenFOAM-2.4.x. I will make the same change to 2.3.x if it works as expected.|
Thanks for the tip Bruno!
Now I just tested the new patch specification and it works exactly as expected in the test case attached.
Bug resolved! Thanks Henry
||Resolved by commit 95a09ca08c5d5e1b9797893df72451d8a8d41317|
|2015-05-22 13:24||zfaraday||New Issue|
|2015-05-22 13:24||zfaraday||File Added: circuitBoardCooling_rad.zip|
|2015-05-22 13:25||zfaraday||File Added: myExternalWallHeatFluxTemperatureFvPatchScalarField.C|
|2015-05-22 13:31||zfaraday||Note Added: 0004785|
|2015-05-24 19:39||henry||Note Added: 0004792|
|2015-05-24 21:31||zfaraday||Note Added: 0004794|
|2015-05-24 21:36||wyldckat||Note Added: 0004795|
|2015-05-24 22:21||henry||Note Added: 0004796|
|2015-05-25 17:28||zfaraday||Note Added: 0004808|
|2015-05-25 17:36||henry||Note Added: 0004809|
|2015-05-25 17:36||henry||Status||new => resolved|
|2015-05-25 17:36||henry||Resolution||open => fixed|
|2015-05-25 17:36||henry||Assigned To||=> henry|