Boundary conditions definition

The 0 folder contains files corresponding to each variable computed during a simulation. You have to define there the initial conditions and boundary conditions. Here are some details for the main variables. Specific instructions are available for each case.

Velocity (U)

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/*--------------------------------*- C++ -*----------------------------------*\
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| ========= | |
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| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
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| \\ / O peration | Version: 2.3.0 |
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| \\ / A nd | Web: www.OpenFOAM.org |
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| \\/ M anipulation | |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class volVectorField;
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object U;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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dimensions [0 1 -1 0 0 0 0];
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internalField uniform (0 0 0);
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boundaryField
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{
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inlet
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{
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type fixedValue;
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value uniform (0.00125 0 0);
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}
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outlet
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{
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type zeroGradient;
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}
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walls
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{
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type fixedValue;
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value uniform (0 0 0);
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}
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topAndBottom
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{
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type empty;
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}
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}
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// ************************************************************************* //

Pressure

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/*--------------------------------*- C++ -*----------------------------------*\
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| ========= | |
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| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
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| \\ / O peration | Version: 2.3.0 |
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| \\ / A nd | Web: www.OpenFOAM.org |
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| \\/ M anipulation | |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class volScalarField;
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object p;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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dimensions [0 2 -2 0 0 0 0];
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internalField uniform 0;
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boundaryField
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{
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inlet
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{
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type zeroGradient;
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}
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outlet
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{
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type fixedValue;
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value uniform 0;
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}
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walls
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{
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type zeroGradient;
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}
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topAndBottom
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{
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type empty;
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}
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}
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// ************************************************************************* //

Turbulent kinetic energy

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/*--------------------------------*- C++ -*----------------------------------*\
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| ========= | |
3
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
4
| \\ / O peration | Version: 2.3.0 |
5
| \\ / A nd | Web: www.OpenFOAM.org |
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| \\/ M anipulation | |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class volScalarField;
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location "0";
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object k;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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dimensions [0 2 -2 0 0 0 0];
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internalField uniform 0.00325;
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boundaryField
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{
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inlet
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{
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type fixedValue;
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value uniform 0.00325;
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}
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outlet
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{
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type zeroGradient;
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}
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walls
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{
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type kqRWallFunction;
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value uniform 0.00325;
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}
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topAndBottom
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{
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type empty;
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}
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}
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// ************************************************************************* //

Turbulent kinetic energy dissipation

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/*--------------------------------*- C++ -*----------------------------------*\
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| ========= | |
3
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
4
| \\ / O peration | Version: 2.3.0 |
5
| \\ / A nd | Web: www.OpenFOAM.org |
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| \\/ M anipulation | |
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\*---------------------------------------------------------------------------*/
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FoamFile
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{
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version 2.0;
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format ascii;
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class volScalarField;
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location "0";
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object epsilon;
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}
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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dimensions [0 2 -3 0 0 0 0];
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internalField uniform 0.000765;
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boundaryField
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{
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inlet
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{
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type fixedValue;
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value uniform 0.000765;
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}
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outlet
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{
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type zeroGradient;
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}
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walls
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{
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type epsilonWallFunction;
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value uniform 0.000765;
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}
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topAndBottom
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{
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type empty;
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}
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}
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// ************************************************************************* //

Remarque

At the walls, specific boundary conditions for turbulence like "kqRWallFunction" and "epsilonWallFunction" are specific wall functions.