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IDProjectCategoryView StatusLast Update
0003835OpenFOAMBugpublic2022-05-06 00:29
ReporterlorenzotrevisanAssigned Tohenry 
PrioritynormalSeverityminorReproducibilityalways
Status closedResolutionno change required 
Platformx86_64OSSlackwareOS Version15.0
Product Versiondev 
Fixed in Version 
Summary0003835: error in thermal equilibrium temperature calculation with chtMultiRegion for two solids
DescriptionConsider two equal solid blocks, one hot and the other cold, brought into contact in an adiabatic container.
After a while, thermal equilibrium is established in the container as a result of heat transfer.
The 1st law of T.D. requires that the amount of energy lost by the hot solid be equal to the amount of energy gained by the cold one.
When the thermal equilibrium is reached the temperature of the two solids is equal to the average of the initial temperatures,
e.g. if Tsolid1ini=300 [K] and Tsolid2ini=700 [K], than Tequilibrium=(300+700)/2 [K]=500 [K].

I attached a simple chtMR case as described before.
If Tsolid1ini=300 [K] and Tsolid2ini=700 [K], than calculated Tequilibrium=502 [K];
while if Tsolid1ini=700 [K] and Tsolid2ini=300 [K], than calculated Tequilibrium=498 [K];
the greater the temperature difference, the greater the error.

I tried to change some value in controlDict, fvShceme and fvSolution, but the error persists,
so finally I decided to report the case as an issue.

I am really not able to find a solution, please help.
Steps To Reproducechange solids temperature in thermalEquilibrium-dev/constant/initialConditions and look at the results, or view log.chtMultiRegion, or plot probes
TagsNo tags attached.

Activities

lorenzotrevisan

2022-05-05 16:44

reporter  

thermalEquilibrium-dev.tar.gz (3,866 bytes)

henry

2022-05-05 16:58

manager   ~0012575

We will need funding to work on your case.

henry

2022-05-06 00:29

manager   ~0012576

User support request.

Issue History

Date Modified Username Field Change
2022-05-05 16:44 lorenzotrevisan New Issue
2022-05-05 16:44 lorenzotrevisan File Added: thermalEquilibrium-dev.tar.gz
2022-05-05 16:58 henry Note Added: 0012575
2022-05-06 00:29 henry Assigned To => henry
2022-05-06 00:29 henry Status new => closed
2022-05-06 00:29 henry Resolution open => no change required
2022-05-06 00:29 henry Note Added: 0012576