[CHUMMAR]

I am very new to OpenFoam and am trying to use chtmultiregionfoam to validate a conjugate numerical problem. I have been able to successfully run blockMesh, topoSet and splitMeshRegions -cellZones -overwrite. but as soon as i type in chtMultiRegionFoam to try and run the problem I face this error which is "cannot find patchField entry for frontAndBack"

BlockMeshDict :-
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object blockMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

convertToMeters 0.001;

vertices
(
(-0.2 0 0)
(1 0 0)
(1 1 0)
(-0.2 1 0)
(-0.2 0 1)
(1 0 1)
(1 1 1)
(-0.2 1 1)
);

blocks
(
hex (0 1 2 3 4 5 6 7) fluid (20 20 10) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
inlet
{
type patch;
faces
(
(4 0 3 7)
);
}
outlet
{
type patch;
faces
(
(5 1 2 6)
);
}
frontAndBack
{
type wall;
faces
(
(0 1 2 3)
(4 5 6 7)
);
}
topAndBottom
{
type wall;
faces
(
(0 1 5 4)
(3 2 6 7)
);
}
);

mergePatchPairs
(
);

topoSetDict :-
actions
(

{
name c0;
type cellSet;
action new;
source boxToCell;
sourceInfo
{
box (-0.2 0 0) (0 1 1);
}
}
{
name solid;
type cellZoneSet;
action new;
source setToCellZone;
sourceInfo
{ set c0; }
}
{
name c1;
type cellSet;
action new;
source boxToCell;
sourceInfo
{
box (0 0 0) (1 1 1);
}
}
{
name fluid;
type cellZoneSet;
action new;
source setToCellZone;
sourceInfo
{ set c1; }
}



);

ERROR :-
Create time

Create fluid mesh for region fluid for time = 0

Create solid mesh for region solid for time = 0

*** Reading fluid mesh thermophysical properties for region fluid

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



--> FOAM FATAL IO ERROR:
Cannot find patchField entry for frontAndBack

file: /home/chummarvm/OpenFOAM-dev/tutorials/heatTransfer/chtMultiRegionFoam/newtest/0/fluid/U.boundaryField from line 27 to line 32.

From function void Foam::GeometricField<Type, PatchField, GeoMesh>::Boundary::readField(const Foam:imensionedField<TypeR, GeoMesh>&, const Foam::dictionary&) [with Type = Foam::Vector<double>; PatchField = Foam::fvPatchField; GeoMesh = Foam::volMesh]
in file /home/ubuntu/OpenFOAM/OpenFOAM-7/src/OpenFOAM/lnInclude/GeometricBoundaryField.C at line 188.

FOAM exiting

[Yann]

Hello Amal,

--> FOAM FATAL IO ERROR:
Cannot find patchField entry for frontAndBack

file:  /home/chummarvm/OpenFOAM-dev/tutorials/heatTransfer/chtMultiRegionFoam/newtest/0/fluid/U.boundaryField  from line 27 to line 32.

The solver cannot find the boundary condition for "frontAndBack" for U in the "fluid" region.


Do you have a boundary condition defined for this patch?
Can you post your U file for the "fluid" region? (0/fluid/U)


Yann

[CHUMMAR]

FoamFile
{
version 2.0;
format ascii;
class volVectorField;
location "0/fluid";
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions [ 0 1 -1 0 0 0 0 ];

internalField uniform (0 0 0);

boundaryField
{

outlet
{
type pressureInletOutletVelocity;
value $internalField;
}
fluid_to_solid
{
type noSlip;
}
}

I am trying to solve a buoyancy driven flow related heat transfer problem and so kept the T file as the main one describing all boundaries.

dimensions [ 0 0 0 1 0 0 0 ];

internalField uniform 300;

boundaryField
{

outlet
{
type inletOutlet;
value $internalField;
inletValue $internalField;
}

frontAndBack
{
type zeroGradient;
}

topAndBottom
{
type zeroGradient;
}

fluid_to_solid
{
type compressible::turbulentTemperatureCoupledBaffleMix ed;
value $internalField;
Tnbr T;
kappaMethod fluidThermo;
}
}

Since I am very new to OpenFOAM pls forgive me for any silly errors.

[Yann]

For every variable, you need to define a boundary condition on each patch in your domain.



This is what the solver complains about in your initial post.


Cheers,
Yann

[CHUMMAR]

Thanks Yann, that was the problem

[rideste]

I'm new in OpenFoam; i'm trying to simulate an heatexchanger tube in tube counter-current air-co2 with a strate of alluminium interposed. I use chtMultiRegionFoam with wall function for y+>30. But when run the simulation at the time=1 there are negative Temperature, so at time=2 give me an error.
I try with fvOptions limiter, but the calculus are very pertub with limiters and diverge.
Someone can help me?

[Yann]

Can you share more about you case setup, especially the boundary conditions you are using?


The log shows big continuity error so my first thought would be that something could be wrong about the boundary conditions.


Yann

[rideste]

used low-Re funcition, mesh wit y+<2.
I try to share file 0/air.
file of co2 is analogus, while in file of alluminium there is p,T with mixedcoupledbaff..... function.
I can't upload files U,alphat,nut.
alphat is all calculated.
nut is all calcultated with lowRe wallFunction.
U fixedvalue inlet, zeroGradient outlet and noSlip on walls.

[rideste]

how i can upload openfoam files?