[sujeet]

I'm trying to run natural convection having one inlet, one outlet and one isothermal wall. having difficulty for the U parameter. I'm attaching the boundary condition file. please help me as it is for my college project and i'm new to openfoam. i'm using buoyantsimplefoam for the solver. for U i have to give the internal field value or else the solver get failed.

blockMesh file.
convertToMeters 1;

vertices
(
(0 0 0) //0
(4 0 0) //1
(0 1 0) //2
(4 1 0) //3
(0 4 0) //4
(4 4 0) //5
(0 5 0) //6
(4 5 0) //7
(0 0 1) //8
(4 0 1) //9
(0 1 1) //10
(4 1 1) //11
(0 4 1) //12
(4 4 1) //13
(0 5 1) //14
(4 5 1) //15
);

blocks
(
hex (0 1 3 2 8 9 11 10) (40 10 1) simpleGrading (1 1 1)
hex (2 3 5 4 10 11 13 12) (40 30 1) simpleGrading (1 1 1)
hex (4 5 7 6 12 13 15 14) (40 10 1) simpleGrading (1 1 1)
);

edges
(
);

boundary
(
top
{
type wall;
faces
(
(6 14 15 7)
);
}
isothermal
{
type wall;
faces
(
(0 1 9 8)
);
}
inlet
{
type patch;
faces
(
(0 8 10 2)
);
}
outlet
{
type patch;
faces
(
(5 7 15 13)
);
}
rightSidewall
{
type wall;
faces
(
(2 10 12 4)
(4 12 14 6)
);
}
sidewall
{
type wall;
faces
(
(1 3 11 9)
(3 5 13 11)
);
}
);

mergePatchPairs
(
);


ALPHA FILE.

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

internalField uniform 0;

boundaryField
{
top
{
type compressible::alphatJayatillekeWallFunction;
Prt 0.71;
value $internalField;
}

isothermal
{
type compressible::alphatJayatillekeWallFunction;
Prt 0.71;
value $internalField;
}
inlet
{
type fixedValue;
value $internalField;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type compressible::alphatJayatillekeWallFunction;
Prt 0.71;
value $internalField;
}

sidewall
{
type compressible::alphatJayatillekeWallFunction;
Prt 0.71;
value $internalField;
}

frontandback
{
type empty;
}
}

EPSILON FILE.

dimensions [0 2 -3 0 0 0 0];

internalField uniform 4.312e-4;

boundaryField
{
top
{
type epsilonWallFunction;
value uniform 4.312e-4;
}

isothermal
{
type epsilonWallFunction;
value uniform 4.312e-4;
}
inlet
{
type fixedValue;
value uniform 4.312e-4;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type epsilonWallFunction;
value uniform 4.312e-4;
}

sidewall
{
type epsilonWallFunction;
value uniform 4.312e-4;
}

frontandback
{
type empty;
}
}

K FILE.
dimensions [0 2 -2 0 0 0 0];

internalField uniform 0.015;

boundaryField
{
top
{
type kqRWallFunction;
value uniform 0.015;
}

isothermal
{
type kqRWallFunction;
value uniform 0.015;
}

inlet
{
type fixedValue;
value uniform 0.015;
}
outlet
{
type zeroGradient;
}

rightSidewall
{
type kqRWallFunction;
value uniform 0.015;
}

sidewall
{
type kqRWallFunction;
value uniform 0.015;
}

frontandback
{
type empty;
}
}

NUT FILE.

dimensions [0 2 -1 0 0 0 0];

internalField uniform 0;

boundaryField
{
top
{
type nutkWallFunction;
value uniform 0;
}

isothermal
{
type nutkWallFunction;
value uniform 0;
}

inlet
{
type calculated;
value uniform 0;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type nutkWallFunction;
value uniform 0;
}

sidewall
{
type nutkWallFunction;
value uniform 0;
}

frontandback
{
type empty;
}
}

P FILE.

dimensions [1 -1 -2 0 0 0 0];

internalField uniform 101325;

boundaryField
{
top
{
type zeroGradient;
}

isothermal
{
type zeroGradient;
}

inlet
{
type zeroGradient;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type zeroGradient;
}

sidewall
{
type zeroGradient;
}

frontandback
{
type empty;
}
}

P_RGH FILE.
dimensions [1 -1 -2 0 0 0 0];

internalField uniform 0;

boundaryField
{
top
{
type fixedFluxPressure;
value uniform 0;
}

isothermal
{
type fixedFluxPressure;
value uniform 0;
}

inlet
{
type fixedFluxPressure;
value uniform 0;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type fixedFluxPressure;
value uniform 0;
}

sidewall
{
type fixedFluxPressure;
value uniform 0;
}

frontandback
{
type empty;
}

T FILE

internalField uniform 300;

boundaryField
{
top
{
type fixedValue;
value $internalField;
}

isothermal
{
type fixedValue;
value uniform 400;
}

inlet
{
type fixedValue;
value uniform 300;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type fixedValue;
value $internalField;
}

sidewall
{
type fixedValue;
value $internalField;
}

frontandback
{
type empty;
}
}

U FILE.
dimensions [0 1 -1 0 0 0 0];

internalField uniform (0.5 0 0);

boundaryField
{
top
{
type noSlip;
}

isothermal
{
type noSlip;
}

inlet
{
type inletOutlet;
inletValue uniform (0.5 0 0);
value $internalField;
}

outlet
{
type zeroGradient;
}

rightSidewall
{
type noSlip;
}

sidewall
{
type noSlip;
}

frontandback
{
type empty;
}
}

[sujeet]

Hey anyone find the solution for my problem. Please rply as im waiting for it.