[CFDavatar]

Hello guys I am new in OpenFOAM, and I am giving my first steps on it. I am facing this problem:

--> FOAM FATAL ERROR:
Continuity error cannot be removed by adjusting the outflow.
Please check the velocity boundary conditions and/or run potentialFoam to initialise the outflow.
Total flux : 0.000171961
Specified mass inflow : 0.0002
Specified mass outflow : 0
Adjustable mass outflow : 1.3242e-165

My p and U files are

------------------------------- 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;
    location	"0";
    object      U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform (0 0 0);

boundaryField
{
    inlet
    {
        type            fixedValue;
        value           uniform (0.054 0 0);
    }

    outlet
    {
        type            zeroGradient;
    }

    wall
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    obstacles
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }

    frontAndBack
    {
        type            empty;
    }
}

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

/--------------------------------- 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;
    location 	"0";
    object      p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

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

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }

    outlet
    {
        type            zeroGradient;
        value		 uniform 0;
    }

    wall
    {
        type            zeroGradient;
    }

    obstacles
    {
        type            zeroGradient;
    }

    frontAndBack
    {
        type            empty;
    }
}

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

I will apreciate any advice,

Thank you

[clapointe]

For incompressible inflow/outflow cases, it is common to fix the pressure at one patch (e.g., the outlet) and the velocity at the other (e.g., the inlet). It looks like you fix the velocity at the inlet, so pressure should be fixed at the outlet. At the moment it looks like pressure is zeroGradient at the inlet and outlet -- try making the outlet a fixedValue (value of zero).

Caelan

[CFDavatar]

Originally Posted by clapointe

For incompressible inflow/outflow cases, it is common to fix the pressure at one patch (e.g., the outlet) and the velocity at the other (e.g., the inlet). It looks like you fix the velocity at the inlet, so pressure should be fixed at the outlet. At the moment it looks like pressure is zeroGradient at the inlet and outlet -- try making the outlet a fixedValue (value of zero).

Caelan

Thanks for the Help!!! It was very Useful