[TGS]

I have three regions in my OpenFoam simulation. My geometry contains a solid fin that was covered by air at room temperature. The air flow is required to go through the fin as well. The one side wall of a fin has a temperature of 400 K. This is simply an air-cooled fin scenario. To solve this problem, I'm using the chtMultiRegionFoam solver, and I've successfully done blockMesh, TopoSet, splitMultiRegions, and snappyHexMesh. However, while I am running the chtMultiRegionsFoam, there is an error generated, and the error looks like this: I am new to OpenFoam and please help me to solve this error.


Thanks.
TGS


/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 10
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
Build : 10-c4cf895ad8fa
Exec : chtMultiRegionFoam
Date : May 25 2023
Time : 12:20:26
Host : "AIE-OpenFOAM"
PID : 129243
I/O : uncollated
Case : /home/thamasha/OpenFOAM/thamasha-10/run/NewFinT
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create fluid mesh for region air for time = 0

Create solid mesh for region fin for time = 0

Create solid mesh for region heatedBoundary for time = 0


PIMPLE: Region air
PIMPLE: No convergence criteria found


PIMPLE: Region fin
PIMPLE: No convergence criteria found


PIMPLE: Region heatedBoundary
PIMPLE: No convergence criteria found


PIMPLE: Operating solver in steady-state mode with 1 outer corrector
PIMPLE: Operating solver in SIMPLE mode


*** Reading fluid mesh thermophysical properties for region air

Adding to thermoFluid

Selecting thermodynamics package
{
type heRhoThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState rhoConst;
specie specie;
energy sensibleEnthalpy;
}

Adding to rhoFluid

Adding to UFluid

Adding to phiFluid

Adding to gFluid

Adding to hRefFluid

Adding to pRefFluid

Adding to ghFluid

Adding to ghfFluid

Adding to turbulenceFluid

Selecting turbulence model type laminar
Selecting laminar stress model Stokes
Adding to thermophysicalTransport

Selecting thermophysical transport type laminar
Selecting default laminar thermophysical transport model unityLewisFourier
Adding to reactionFluid

Combustion model not active: combustionProperties not found
Selecting combustion model none
Adding to KFluid

Adding to dpdtFluid

Adding to fieldsFluid

Adding MRF

No MRF models present

Adding fvModelsFluid

Creating fvModels from "constant/fvModels"

Selecting finite volume model type interRegionHeatTransfer
Name: air_to_heatedBoundary
Selecting heatTransferModel constant
Adding fvConstraintsFluid

--> FOAM Warning : Creating fvConstraints from "system/fvOptions"

Selecting finite volume constraint type limitTemperature
Name: limitT
- selecting all cells
- selected 1057 cell(s) with volume 79275
*** Reading solid mesh thermophysical properties for region fin

Adding to thermoSolid

Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIsoSolid;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}

Adding to fvModelsSolid

--> FOAM Warning : Creating fvModels from "system/fvOptions" rather than constant/fvModels
Adding fvConstraintsSolid

--> FOAM Warning : Creating fvConstraints from "system/fvOptions"

Selecting finite volume constraint type limitTemperature
Name: limitT
- selecting all cells
- selected 62 cell(s) with volume 4650
*** Reading solid mesh thermophysical properties for region heatedBoundary

Adding to thermoSolid

Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIsoSolid;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}

Adding to fvModelsSolid

Creating fvModels from "constant/fvModels"

Selecting finite volume model type interRegionHeatTransfer
Name: heatedBoundary_to_air
Selecting heatTransferModel constant
Adding fvConstraintsSolid

Creating fvConstraints from "system/fvConstraints"

Selecting finite volume constraint type fixedTemperatureConstraint
Name: fixedTemperature
- selecting all cells
- selected 1 cell(s) with volume 75
Region: air Courant Number mean: 1.35289e-05 max: 5e-05
Region: fin Diffusion Number mean: 4.88372e-10 max: 3.65798e-09
--> FOAM Warning :
From function Type Foam::gAverage(const Foam::UList<T>&, Foam::label) [with Type = double; Foam::label = int]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/FieldFunctions.C at line 597
empty field, returning zero.
Region: heatedBoundary Diffusion Number mean: 0 max: 3.65798e-09
--> FOAM Warning :
From function virtual void Foam:robes::findElements(const Foam::fvMesh&)
in file probes/probes.C at line 117
Did not find location (-0.054 0.018 0.017) in any cell. Skipping location.
--> FOAM Warning :
From function virtual void Foam:robes::findElements(const Foam::fvMesh&)
in file probes/probes.C at line 117
Did not find location (-0.054 0.018 -0.017) in any cell. Skipping location.
--> FOAM Warning :
From function virtual void Foam:robes::findElements(const Foam::fvMesh&)
in file probes/probes.C at line 117
Did not find location (-0.054 0.018 0) in any cell. Skipping location.
--> FOAM Warning :
From function virtual void Foam:robes::findElements(const Foam::fvMesh&)
in file probes/probes.C at line 117
Did not find location (-0.07 0.018 0) in any cell. Skipping location.






fieldAverage volAvgFinT:
Starting averaging at time 0

fieldAverage volAvgAirT:
Starting averaging at time 0

deltaT = 0.0001
Region: air Courant Number mean: 1.35289e-05 max: 5e-05
Region: fin Diffusion Number mean: 4.88372e-10 max: 3.65798e-09
--> FOAM Warning :
From function Type Foam::gAverage(const Foam::UList<T>&, Foam::label) [with Type = double; Foam::label = int]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/FieldFunctions.C at line 597
empty field, returning zero.
Region: heatedBoundary Diffusion Number mean: 0 max: 3.65798e-09
deltaT = 0.000119048
Time = 0.000119048s


Solving for solid region fin
GAMG: Solving for e, Initial residual = 0.465165, Final residual = 0.401726, No Iterations 1000
Min/max T:300 300

Solving for solid region heatedBoundary
- selecting inter region mapping
Creating mesh-to-mesh addressing for heatedBoundary and air regions using cellVolumeWeight
Overlap volume: 0
diagonal: Solving for e, Initial residual = 0, Final residual = 0, No Iterations 0
Min/max T:300 399.987

Solving for fluid region air
DILUPBiCGStab: Solving for Ux, Initial residual = 0.998985, Final residual = 0.00181951, No Iterations 1
DILUPBiCGStab: Solving for Uy, Initial residual = 0.997048, Final residual = 0.00222112, No Iterations 1
DILUPBiCGStab: Solving for Uz, Initial residual = 1, Final residual = 0.00429678, No Iterations 1


--> FOAM FATAL ERROR:

request for polyMesh region0 from objectRegistry NewFinT failed
available objects of type polyMesh are

3
(
air
fin
heatedBoundary
)


From function const Type& Foam:bjectRegistry::lookupObject(const Foam::word&) const [with Type = Foam:olyMesh]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/objectRegistryTemplates.C at line 211.

FOAM aborting

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::error::abort() at ??:?
#2 Foam:olyMesh const& Foam:bjectRegistry::lookupObject<Foam:olyMesh> (Foam::word const&) const at ??:?
#3 Foam::compressible::turbulentTemperatureCoupledBaf fleMixedFvPatchScalarField::updateCoeffs() at ??:?
#4 Foam::mixedFvPatchField<double>::evaluate(Foam::UP stream::commsTypes) at ??:?
#5 Foam::mixedEnergyFvPatchScalarField::updateCoeffs( ) at ??:?
#6 Foam::fvMatrix<double>::fvMatrix(Foam::GeometricFi eld<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::dimensionSet const&) in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#7 Foam::tmp<Foam::fvMatrix<double> > Foam::fvModels::source<double, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&, Foam::dimensionSet const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) const in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#8 ? in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#9 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
Aborted (core dumped)

[LuckyTran]

You have 3 meshed regions named air, fin, and heated boundary. Your build is trying to find a meshed region that has the name "region0" and it doesn't exist.

Search all your dicts and find region0 and rename it to the correct region.

Since the solver stops right after completing one step through the air region but before printing the Courant number, the most likely culprit is probably in your controlDict in the CourantNo object. You most likely yoinked it from a tutorial and forgot to specify the region. Change region0 to air.

Co1
{
    // Mandatory entries (unmodifiable)
    type            CourantNo;
    libs            (fieldFunctionObjects);

    // Optional entries (runtime modifiable)
    rho             rho;

    // Optional (inherited) entries
    field           <phi>;
    result          <fieldResult>;
    region          region0;
    enabled         true;
    log             true;
    timeStart       0;
    timeEnd         1000;
    executeControl  timeStep;
    executeInterval 1;
    writeControl    timeStep;
    writeInterval   1;
 }

[TGS]

Dear Lucky,


Thank you very much for the detailed answer and your time of helping me. I will try according to your advice and let you know.


Many thanks again.


TGS

[TGS]

Dear Lucky,


I tried by using the function that you mentioned in the thread to Courant number and changed the region to air. However, still I am getting the same error . Here I attached my controlDict file and the error message as well. If you have any free time ,can you please check it.


many thanks in advance.


TGS.

ControlDict file.
/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 8
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object controlDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

application chtMultiRegionFoam;

startFrom startTime;

startTime 0;

stopAt endTime;

endTime 10;

deltaT 0.0001;

writeControl adjustableRunTime;

writeInterval 0.01;

purgeWrite 0;

writeFormat binary;

writePrecision 6;

writeCompression off;

timeFormat general;

timePrecision 6;

runTimeModifiable on;

adjustTimeStep on;

functions
{
probes
{
libs ("libsampling.so");
type probes;

// Name of the directory for probe data.
name probes;

// Write at same frequency as fields.

region air ;
enabled true;
log true;
timeStart 0;
timeEnd 10;
executeControl timeStep;
executeInterval 1;
writeControl timeStep;
writeInterval 1;

// Fields to be probed.
fields
(
p U T
);
probeLocations
(
( 26.25 18.75 1.25 ) // Exit from fin.
( 27.00 10.00 35.00 ) // Entrance to fin
( 28.50 20.00 40.00 ) // Above fin.
);
}
Co1
{
// Mandatory entries (unmodifiable)
type CourantNo;
libs ("libfieldFunctionObjects.so");

// Optional entries (runtime modifiable)

// Optional (inherited) entries

region air;
enabled true;
log true;
timeStart 0;
timeEnd 10;
executeControl timeStep;
executeInterval 1;
writeControl timeStep;
writeInterval 1;
}





}
// ************************************************** *********************** //


Error Message

*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 10
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
Build : 10-c4cf895ad8fa
Exec : chtMultiRegionFoam
Date : May 26 2023
Time : 09:48:52
Host : "AIE-OpenFOAM"
PID : 144895
I/O : uncollated
Case : /home/thamasha/OpenFOAM/thamasha-10/run/NewFinT
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster (fileModificationSkew 10)
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create fluid mesh for region air for time = 0

Create solid mesh for region fin for time = 0

Create solid mesh for region heatedBoundary for time = 0


PIMPLE: Region air
PIMPLE: No convergence criteria found


PIMPLE: Region fin
PIMPLE: No convergence criteria found


PIMPLE: Region heatedBoundary
PIMPLE: No convergence criteria found


PIMPLE: Operating solver in steady-state mode with 1 outer corrector
PIMPLE: Operating solver in SIMPLE mode


*** Reading fluid mesh thermophysical properties for region air

Adding to thermoFluid

Selecting thermodynamics package
{
type heRhoThermo;
mixture pureMixture;
transport const;
thermo hConst;
equationOfState rhoConst;
specie specie;
energy sensibleEnthalpy;
}

Adding to rhoFluid

Adding to UFluid

Adding to phiFluid

Adding to gFluid

Adding to hRefFluid

Adding to pRefFluid

Adding to ghFluid

Adding to ghfFluid

Adding to turbulenceFluid

Selecting turbulence model type laminar
Selecting laminar stress model Stokes
Adding to thermophysicalTransport

Selecting thermophysical transport type laminar
Selecting default laminar thermophysical transport model unityLewisFourier
Adding to reactionFluid

Combustion model not active: combustionProperties not found
Selecting combustion model none
Adding to KFluid

Adding to dpdtFluid

Adding to fieldsFluid

Adding MRF

No MRF models present

Adding fvModelsFluid

Creating fvModels from "constant/fvModels"

Selecting finite volume model type interRegionHeatTransfer
Name: air_to_heatedBoundary
Selecting heatTransferModel constant
Adding fvConstraintsFluid

--> FOAM Warning : Creating fvConstraints from "system/fvOptions"

Selecting finite volume constraint type limitTemperature
Name: limitT
- selecting all cells
- selected 1057 cell(s) with volume 79275
*** Reading solid mesh thermophysical properties for region fin

Adding to thermoSolid

Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIsoSolid;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}

Adding to fvModelsSolid

--> FOAM Warning : Creating fvModels from "system/fvOptions" rather than constant/fvModels
Adding fvConstraintsSolid

--> FOAM Warning : Creating fvConstraints from "system/fvOptions"

Selecting finite volume constraint type limitTemperature
Name: limitT
- selecting all cells
- selected 62 cell(s) with volume 4650
*** Reading solid mesh thermophysical properties for region heatedBoundary

Adding to thermoSolid

Selecting thermodynamics package
{
type heSolidThermo;
mixture pureMixture;
transport constIsoSolid;
thermo eConst;
equationOfState rhoConst;
specie specie;
energy sensibleInternalEnergy;
}

Adding to fvModelsSolid

Creating fvModels from "constant/fvModels"

Selecting finite volume model type interRegionHeatTransfer
Name: heatedBoundary_to_air
Selecting heatTransferModel constant
Adding fvConstraintsSolid

Creating fvConstraints from "system/fvConstraints"

Selecting finite volume constraint type fixedTemperatureConstraint
Name: fixedTemperature
- selecting all cells
- selected 1 cell(s) with volume 75
Region: air Courant Number mean: 1.35289e-05 max: 5e-05
Region: fin Diffusion Number mean: 4.88372e-10 max: 3.65798e-09
--> FOAM Warning :
From function Type Foam::gAverage(const Foam::UList<T>&, Foam::label) [with Type = double; Foam::label = int]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/FieldFunctions.C at line 597
empty field, returning zero.
Region: heatedBoundary Diffusion Number mean: 0 max: 3.65798e-09
deltaT = 0.0001
functionObjects::CourantNo Co1 writing field: Co
Region: air Courant Number mean: 1.35289e-05 max: 5e-05
Region: fin Diffusion Number mean: 4.88372e-10 max: 3.65798e-09
--> FOAM Warning :
From function Type Foam::gAverage(const Foam::UList<T>&, Foam::label) [with Type = double; Foam::label = int]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/FieldFunctions.C at line 597
empty field, returning zero.
Region: heatedBoundary Diffusion Number mean: 0 max: 3.65798e-09
deltaT = 0.000119048
Time = 0.000119048s


Solving for solid region fin
GAMG: Solving for e, Initial residual = 0.465165, Final residual = 0.401726, No Iterations 1000
Min/max T:300 300

Solving for solid region heatedBoundary
- selecting inter region mapping
Creating mesh-to-mesh addressing for heatedBoundary and air regions using cellVolumeWeight
Overlap volume: 0
diagonal: Solving for e, Initial residual = 0, Final residual = 0, No Iterations 0
Min/max T:300 399.987

Solving for fluid region air
DILUPBiCGStab: Solving for Ux, Initial residual = 0.998985, Final residual = 0.00181951, No Iterations 1
DILUPBiCGStab: Solving for Uy, Initial residual = 0.997048, Final residual = 0.00222112, No Iterations 1
DILUPBiCGStab: Solving for Uz, Initial residual = 1, Final residual = 0.00429678, No Iterations 1


--> FOAM FATAL ERROR:

request for polyMesh region0 from objectRegistry NewFinT failed
available objects of type polyMesh are

3
(
air
fin
heatedBoundary
)


From function const Type& Foam:bjectRegistry::lookupObject(const Foam::word&) const [with Type = Foam:olyMesh]
in file /home/ubuntu/OpenFOAM/OpenFOAM-10/src/OpenFOAM/lnInclude/objectRegistryTemplates.C at line 211.

FOAM aborting

#0 Foam::error:rintStack(Foam::Ostream&) at ??:?
#1 Foam::error::abort() at ??:?
#2 Foam:olyMesh const& Foam:bjectRegistry::lookupObject<Foam:olyMesh> (Foam::word const&) const at ??:?
#3 Foam::compressible::turbulentTemperatureCoupledBaf fleMixedFvPatchScalarField::updateCoeffs() at ??:?
#4 Foam::mixedFvPatchField<double>::evaluate(Foam::UP stream::commsTypes) at ??:?
#5 Foam::mixedEnergyFvPatchScalarField::updateCoeffs( ) at ??:?
#6 Foam::fvMatrix<double>::fvMatrix(Foam::GeometricFi eld<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::dimensionSet const&) in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#7 Foam::tmp<Foam::fvMatrix<double> > Foam::fvModels::source<double, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> >(Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&, Foam::word const&, Foam::dimensionSet const&, Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh> const&) const in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#8 ? in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
#9 ? in "/lib/x86_64-linux-gnu/libc.so.6"
#10 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#11 ? in "/opt/openfoam10/platforms/linux64GccDPInt32Opt/bin/chtMultiRegionFoam"
Aborted (core dumped)

[LuckyTran]

It still means that you have region region0 declared somewhere in one of your dicts. Ctrl + F is your friend

[TGS]

Dear Lucky,


Okay. I will search thank you so much.


TGS