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Difficulty in selecting the correct Boundary Conditions for an open water channel

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Old   January 29, 2016, 15:09
Smile Difficulty in selecting the correct Boundary Conditions for an open water channel
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Luis Felipe Rojas
Join Date: Aug 2015
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Good Afternoon , My name is Luis Rojas . I am trying to Configure my boundary Conditions on my mesh , the problem is... I have a openChannel Water open to the atmosphere and I am trying to configure my case just to see the flow and the validation of the Mesh. That's Ok ...

Here I attached the p. File of the 0 conditions
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform 0;

boundaryField
{

entrada
{
type zeroGradient;
}

salida
{
type zeroGradient;
}

muros
{
type zeroGradient;
}

superficielibre
{
type empty;
}
}

// ************************************************** *********************** //
HERE IS THE U. file

/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.3.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField uniform (0 0 0);

boundaryField
{
entrada
{
type fixedValue;
value uniform (37.16 0 0);
}


salida
{
type inletOutlet;
value internalField;
inletValue uniform (0 0 0);
}

muros
{
type zeroGradient;
value uniform (0 0 0);
}

superficielibre
{
type empty;
}
}

// ************************************************** *********************** //

entrada - is inlet , Salida is outlet , Superficie Libre is the top of the channel and muros are the walls of the channel... I just need to configure the boundary conditions to the atmospheric Preassure in the freesurface but i dont know what to change on this.. That's is a empty face... Either the inlet and outlet are patches... I need help to configure the Boundary for the outlet... giving the initial conditions to OpenFoam and this obtain the results of all the channel.
Thanks A lot.
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atmosphere, boundary conditions, freesurface, openfoam

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