zhyang-dev/OpenFOAM-12
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

compressible::alphatWallBoilingWallFunction: Improved solution procedure

Browse Source 
This boundary condition now solves for the wall temperature by interval
bisection, which should be significantly more robust than the previous
fixed-point iteration procedure. There is a new non-dimensional
"tolerance" setting that controls how tightly this solution procedure
solves the wall temperature. The "relax" setting is no longer used.

The boundary condition no longer triggers re-evaluation of the
temperature condition in order to re-calculate the heat flux within the
solution iteration. Instead, it extracts physical coefficients from the
form of the boundary condition and uses these to form a linearised
approximation of the heat flux. This is a more general approach, and
will not trigger side-effects associated with re-evaluating the
temperature condition.

The fixedMultiphaseHeatFlux condition has been replaced by a
uniformFixedMultiphaseHeatFlux condition, which constructs a mixed
constraint which portions a specified heat flux between the phases in
such a way as to keep the boundary temperature uniform across all
phases. This can be applied to all phases. It is no longer necessary to
apply a heat flux model to one "master" phase, then map the resulting
temperature to the others. An example specification of this boundary
condition is as follows:

    wall
    {
        type            uniformFixedMultiphaseHeatFlux;
        q               1000;
        relax           0.3;
        value           $internalField;
    }

The wall boiling tutorials have been updated to use these new functions,
and time-varying heat input has been used to replace the
stop-modify-restart pattern present in the single-region cases.
This commit is contained in:
Will Bainbridge
2023-01-18 12:27:10 +00:00
parent 42c35a23a8
commit 377080de52
34 changed files with 1050 additions and 781 deletions
Download Patch File Download Diff File Expand all files Collapse all files

19
tutorials/modules/multiphaseEuler/wallBoilingIATE/Allrun
View File

@ -10,16 +10,8 @@ runApplication decomposePar
runParallel $(getApplication)
if ! isTest "$@"
then
runApplication -a foamDictionary system/controlDict -entry endTime -set 4
runApplication -a foamDictionary system/controlDict -entry startTime -set 0.5
runParallel -a foamDictionary 0.5/T.liquid -entry boundaryField/wall/q -set "uniform 73890"
runParallel -a foamDictionary 0.5/U.liquid -entry boundaryField/inlet/type -set "fixedValue"
runParallel -a $(getApplication)
fi
runApplication reconstructPar -latestTime
runApplication foamPostProcess -latestTime -func "
graphCell
(
@ -28,9 +20,6 @@ runApplication foamPostProcess -latestTime -func "
end=(3.4901 0.0096 0),
fields=(alpha.gas T.liquid T.gas d.gas)
)"
./validation/createGraphs
runApplication -append foamPostProcess -latestTime -func "
patchSurface
(
@ -41,6 +30,10 @@ runApplication -append foamPostProcess -latestTime -func "
fields=(dDeparture.liquid fDeparture.liquid nucleationSiteDensity.liquid wetFraction.liquid qQuenching.liquid qEvaporative.liquid)
)"
./validation/createWallBoilingPropertiesGraphs
if ! isTest "$@"
then
./validation/createGraphs
./validation/createWallBoilingPropertiesGraphs
fi
#------------------------------------------------------------------------------