[MFWilliams]

Hello,


I am trying to implement a time varying velocity boundary condition and so am editing the 3dTube solids4foam case to test things out.


I have edited the 'U' file in 0/fluid/ to say this:


inlet
{
type uniformFixedValue;
uniformValue table
(
(0 (0 1.3332 0))
(3e-3 (0 1.3332 0))
(3.1e-3 (0 0 0))
(1e-2 (0 0 0))
);
}


However, I get this error:


--> FOAM FATAL IO ERROR:
Expected a '(' while reading VectorSpace<Form, Cmpt, nCmpt>, found on line 38 the word 'table'

file: /mnt/c/Users/merli/simulations/3dTest2/0/fluid/U::boundaryField::inlet::uniformValue at line 38.

From function Istream::readBegin(const char*)
in file db/IOstreams/IOstreams/Istream.C at line 86.

FOAM exiting


I have no idea what is wrong because I am following the syntax set out on this page https://cfd.direct/openfoam/user-guide/v9-boundaries/ in section 5.2.3.4.


Please can someone tell me why I am experiencing this error?
Thank you for your help

Best regards

[JulioPieri]

The syntax seems ok. I copied what you wrote to another case and it ran. It might be an error somewhere else in the U file. Share it here in code quotes

[MFWilliams]

Oh ok. Thank you, here is the U file:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     3.0                                |
|   \\  /    A nd           | Web:         http://www.extend-project.de       |
|    \\/     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
{
    symmetry-x
    {
        type         symmetryPlane;
    }

    symmetry-y
    {
        type         symmetryPlane;
    }
    outlet
    {
        type         zeroGradient;
    }
    inlet
    {
        type       uniformFixedValue;
        uniformValue       table
        (
        (0       (0 1.3332 0))
        (3e-3    (0 1.3332 0))
        (3.1e-3  (0 0 0))
        (1e-2    (0 0 0))
        );
    }
    wall
    {
        type         newMovingWallVelocity;
        value        uniform (0 0 0);
    }
}
// ************************************************************************* //

I also edited the pressure file, shown below. I basically tried to move the time varying input from the p file to the U file.

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

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

internalField   uniform 0;

boundaryField
{
    symmetry-x
    {
        type        symmetryPlane;
    }
    symmetry-y
    {
        type        symmetryPlane;
    }
    outlet
    {
        type        fixedFluxExtrapolatedPressure;
        value       uniform 0;
    }
    inlet
    {
        type        fixedFluxExtrapolatedPressure;
        value       uniform 0;
    }
    wall
    {
        type       zeroGradient;
        // type       extrapolatedPressure;
        value      uniform 0;
    }


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

[JulioPieri]

Well, everything looks ok from here.. But I don't have foam-extend installed to try this sorry. I'd check for updates that might have fixed this. Or maybe this set of BCs doesnt support table? Try writing chunks of you BC file to another case to boil down the error.

[MFWilliams]

Ok thanks i'll give it a go

[Chanikya_Valeti]

Hii Williams,
have you resolved the issue, Im also trying to use timeVarying boundary condition.