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IDProjectCategoryView StatusDate SubmittedLast Update
0002953OpenFOAMBugpublic2018-05-23 09:052018-05-25 09:44
ReporterHTauber Assigned Tohenry  
PrioritynormalSeverityminorReproducibilityalways
Status resolvedResolutionfixed 
PlatformGNU/LinuxOSUbuntuOS Version16.04
Product Versiondev 
Fixed in Versiondev 
Summary0002953: externalWallHeatFluxTemperature causes wrong results if emissivity is not zero
DescriptionHi,
I'm using chtMultiRegionFoam for calculating the thermal conduction in the solids. At one boundary I use the externalWallHeatFluxTemperature condition by using the coefficient mode. The heat transfer coefficient is set to 7 W/m².K and the emissivity is set to 0.3. If Ta=300 and the temperature of the solid is 300 K as well, no heat flux should be expected. But when emissivity > 0 there is noticed a heat flux (as seen in figure1).
Steps To Reproducein file 0/solid2/T

    wall1
    {
        type externalWallHeatFluxTemperature;
        value uniform 300;
        mode coefficient;
        Ta constant 300;
        h uniform 7;
        kappaMethod solidThermo;
        emissivity 0.3;
    }
TagsNo tags attached.

Activities

HTauber

2018-05-23 09:05

reporter  

figure1.jpg (66,756 bytes)   
figure1.jpg (66,756 bytes)   

henry

2018-05-23 09:16

manager   ~0009630

Steps to reproduce?

HTauber

2018-05-23 09:28

reporter   ~0009631

Which further information do you need ?

henry

2018-05-23 09:38

manager   ~0009632

I only see an image attached and the instructions to

in file 0/solid2/T

    wall1
    {
        type externalWallHeatFluxTemperature;
        value uniform 300;
        mode coefficient;
        Ta constant 300;
        h uniform 7;
        kappaMethod solidThermo;
        emissivity 0.3;
    }

but I don't have the file 0/solid2/T or any other file of the case. Is this a tutorial case? If so which one? If not is the case available somewhere?

HTauber

2018-05-23 10:13

reporter   ~0009633

Enclosed you will find the case.
externalWall.tar.gz (3,751 bytes)

henry

2018-05-23 14:16

manager   ~0009634

This should be resolved by commit 6c560795cb3a1860d1800ddc3c3b43ad6688b82d

Issue History

Date Modified Username Field Change
2018-05-23 09:05 HTauber New Issue
2018-05-23 09:05 HTauber File Added: figure1.jpg
2018-05-23 09:16 henry Note Added: 0009630
2018-05-23 09:28 HTauber Note Added: 0009631
2018-05-23 09:38 henry Note Added: 0009632
2018-05-23 10:13 HTauber File Added: externalWall.tar.gz
2018-05-23 10:13 HTauber Note Added: 0009633
2018-05-23 14:16 henry Note Added: 0009634
2018-05-25 09:44 henry Assigned To => henry
2018-05-25 09:44 henry Status new => resolved
2018-05-25 09:44 henry Resolution open => fixed
2018-05-25 09:44 henry Fixed in Version => dev