[troparry]

Hello,

I'm working on a CFD Direct Amazon Web Services (AWS) EC2 instance, that has OF 6 installed on ubuntu 18.04 LTS. CFD Direct recently migrated to OF 6 on AWS.

I was adapting one of my chtMultiRegionSimpleFoam cases from OF 5 to chtMultiRegionFoam on OF 6, the "simple" version of this solver has been deprecated since chtMultiRegionFoam can now run both steady and transient solutions. See this link: https://openfoam.org/release/6/

I ran into an error with the wallHeatFlux post process utility, so I moved to the multiRegionHeaterRadiation tutorial (which is similar to my case) and the error persisted. To replicate it, simply run the Allrun script in this tutorial, and then run the wallHeatFlux utility on one of the fluid regions like this (error output shown as well):

~/OpenFOAM/ubuntu-6/run/multiRegionHeaterRadiation(69) chtMultiRegionFoam -postProcess -func wallHeatFlux -region bottomAir > log_Fluid_Heat_Flux_Energy_Balance


--> FOAM FATAL ERROR: 

    request for volScalarField wallHeatFlux from objectRegistry bottomAir failed
    available objects of type volScalarField are

14
(
thermo:mu
thermo:psi
K
h
rho
p_rgh
Qdot
qr
dpdt
gh
p
T
thermo:rho
thermo:alpha
)


    From function const Type& Foam::objectRegistry::lookupObject(const Foam::word&) const [with Type = Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>]
    in file /home/ubuntu/OpenFOAM/OpenFOAM-6/src/OpenFOAM/lnInclude/objectRegistryTemplates.C at line 193.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) at ??:?
#1  Foam::error::abort() at ??:?
#2  Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const& Foam::objectRegistry::lookupObject<Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >(Foam::word const&) const at ??:?
#3  Foam::functionObjects::wallHeatFlux::execute() at ??:?
#4  Foam::functionObjects::timeControl::execute() at ??:?
#5  Foam::functionObjectList::execute() at ??:?
#6  ? in "/opt/openfoam6/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#7  __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#8  ? in "/opt/openfoam6/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
Aborted (core dumped)

It seems that volScalarField wallHeatFlux needs to be added to the object registry. My log file is attached. Looking at the log file it seems the the heatflux utility works for timestep 0, but not for any subsequent timesteps.

I've been able to use the wallheatflux utility like this in multiple OF versions, including OF 5. In the OF 6 release, there was some modifications done on the wallHeatFlux utility and I'm wondering if this caused the issue. Is this a bug?

Tim

[JesusJoker]

Check this thread

WallHeatFlux and chtMultiregion

It is not specified, but once moved all files into a sperate folder you should load a higher version of OF (like 8), after having unloaded the 6.

Then just type INTO THE NEW CREATED FOLDER

PHP Code:

rhoPimpleFoam -postProcess -func wallHeatFlux