[sholland]

Hi,



I am looking in the ventilation of a battery module. As I am new to OpenFOAM I have simplified the model as much as possible, making it both 2D and only using rectangular space claims.



I am trying to determine the flow rate across each level of the battery due to different fans.



How is openFOAM computing the volumetric flow rate in my fanCurve file if the model is "infinitely" deep?



Can any one explain why I get the following two error with my fanCurve file. If I don't comment out lines 8-15


I get the error

--> FOAM FATAL IO ERROR:
incorrect first token, expected <int> or '(', found on line 8 the word 'FoamFile'

file: /home/sholland/OpenFOAM/sholland-8/run/full_mod_initial_tests/y30_fan_inlet/constant/fanCurve at line 8.

From function Foam::Istream& Foam:perator>>(Foam::Istream&, Foam::List<T>&) [with T = Foam::Tuple2<double, double>]
in file lnInclude/ListIO.C at line 148.

FOAM exiting

But if I comment it out when I go to open ParaView I get the following error message.

--> FOAM Warning :
From function bool Foam::IOobject::readHeader(Foam::Istream&)
in file db/IOobject/IOobjectReadHeader.C at line 88
Reading "/home/sholland/OpenFOAM/sholland-8/run/full_mod_initial_tests/y30_fan_inlet/constant/fanCurve" at line 17
First token could not be read or is not the keyword 'FoamFile'

Check header is of the form:


/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 7
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class IOobject;
location "constant";
object fanCurve;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

See fan curve file below.

/*--------------------------------*- C++ -*----------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     | Website:  https://openfoam.org
    \\  /    A nd           | Version:  7
     \\/     M anipulation  |
\*---------------------------------------------------------------------------*/
// FoamFile
// {
//    version     2.0;
//    format      ascii;
//    class       IOobject;
//    location    "constant";
//    object      fanCurve;
//}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
5
(
(34 192.06) //(velocity pressure_jump)
(40 174.60)
(45 163.25)
(50 151.03)
(58 126.58)
)


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

Secondly as this is a 2D case, how is openFOAM process the volumetric flow rate aspect of the fan curve? As it has no depth.





p initial conditions:

/*--------------------------------*- 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       volScalarField;
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    back
    {
        type            empty;
    }

    bottom
    {
        type            zeroGradient;
    }

    front
    {
        type            empty;
    }

    inlet
    {
        type            fanPressure;
        file            "./constant/fanCurve";
        outOfBounds     clamp;
        direction       in;         //in | out
        p0              uniform 0;
        value           uniform 0;
    }

    left
    {
        type            zeroGradient;
    }

    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }

    right
    {
        type            zeroGradient;
    }

    submod_0
    {
        type            zeroGradient;
    }


    submod_1
    {
        type            zeroGradient;
    }

    submod_2
    {
        type            zeroGradient;
    }

    submod_3
    {
        type            zeroGradient;
    }

    submod_4
    {
        type            zeroGradient;
    }

    submod_5
    {
        type            zeroGradient;
    }

    submod_6
    {
        type            zeroGradient;
    }

    top
    {
        type            zeroGradient;
    }

}

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

U initial conditions

/*--------------------------------*- 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       volVectorField;
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform (0 0 0);

boundaryField
{
    back
    {
        type            empty;
    }

    bottom
    {
        type            noSlip;
    }

    front
    {
        type            empty;
    }

    inlet
    {
        type            pressureInletOutletVelocity;
        value           uniform (0 0 0);    
    }

    left
    {
        type            noSlip;
    }

    outlet
    {
        type            zeroGradient;
    }

    right
    {
        type            noSlip;
    }

    submod_0
    {
        type            noSlip;
    }

    submod_1
    {
        type            noSlip;
    }

    submod_2
    {
        type            noSlip;
    }

    submod_3
    {
        type            noSlip;
    }

    submod_4
    {
        type            noSlip;
    }

    submod_5
    {
        type            noSlip;
    }

    submod_6
    {
        type            noSlip;
    }

    top
    {
        type            noSlip;
    }

}

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

Picture attached for clarity. The inlet is at the bottom left and the outlet it the top right.



Looking to replicate the following fan:



https://docs.rs-online.com/b185/A700000006481223.pdf