[shuoxue]

I'm solving a 2D flow around a circular cylinder case with interFoam solver.
Here are the geometry and BCs.
1.jpg

0/U file

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     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            uniformFixedValue;
        uniformValue    constant (0.0006 0 0);
    }
    outlet
    {
        type            zeroGradient;
    }
    side
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    cylinder
    {
        type            fixedValue;
        value           uniform (0 0 0);
    }
    qianhou
    {
        type            empty;
    }
}


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

0/p_rhg file

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      p_rgh;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [1 -1 -2 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }
    outlet
    {
        type            fixedValue;
        value           uniform 0;
    }
    side
    {
        type            zeroGradient;
    }
    cylinder
    {
        type            zeroGradient;
    }
    qianhou
    {
        type            empty;
    }
}

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

0/alpha1 file

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       volScalarField;
    object      alpha;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

dimensions      [0 0 0 0 0 0 0];

internalField   uniform 0;

boundaryField
{
    inlet
    {
        type            zeroGradient;
    }
    outlet
    {
        type            zeroGradient;
    }
    side
        type            zeroGradient;
    }
    cylinder
    {
        type            zeroGradient;
    }
    qianhou
    {
        type            empty;
    }
}

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

Error occurs when interFoam is executed.

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.2.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.2.0-5be49240882f
Exec   : interFoam
Date   : Aug 31 2013
Time   : 16:18:13
Host   : "luyao"
PID    : 4652
Case   : /home/luyao/OpenFOAM/luyao-2.2.0/run/cylinder
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Create mesh for time = 0


PIMPLE: Operating solver in PISO mode

Reading field p_rgh

Reading field U

Reading/calculating face flux field phi

Reading transportProperties

Selecting incompressible transport model Newtonian
Selecting incompressible transport model Newtonian


--> FOAM FATAL ERROR: 
Attempt to return primitive entry ITstream : /home/luyao/OpenFOAM/luyao-2.2.0/run/cylinder/0/alpha1.boundaryField.side, line 32, IOstream: Version 2.0, format ASCII, line 0, OPENED, GOOD
    primitiveEntry 'side' comprises 
        on line 32 the word 'type'
        on line 32 the word 'zeroGradient'
 as a sub-dictionary

    From function const dictionary& primitiveEntry::dict() const
    in file db/dictionary/primitiveEntry/primitiveEntry.C at line 184.

FOAM aborting

#0  Foam::error::printStack(Foam::Ostream&) in "/opt/openfoam220/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#1  Foam::error::abort() in "/opt/openfoam220/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#2  Foam::primitiveEntry::dict() const in "/opt/openfoam220/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#3  Foam::dictionary::subDict(Foam::word const&) const in "/opt/openfoam220/platforms/linuxGccDPOpt/lib/libOpenFOAM.so"
#4  Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::GeometricBoundaryField::readField(Foam::DimensionedField<double, Foam::volMesh> const&, Foam::dictionary const&) in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"
#5  Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::readFields(Foam::dictionary const&) in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"
#6  Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::readFields() in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"
#7  Foam::GeometricField<double, Foam::fvPatchField, Foam::volMesh>::GeometricField(Foam::IOobject const&, Foam::fvMesh const&) in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"
#8  Foam::twoPhaseMixture::twoPhaseMixture(Foam::GeometricField<Foam::Vector<double>, Foam::fvPatchField, Foam::volMesh> const&, Foam::GeometricField<double, Foam::fvsPatchField, Foam::surfaceMesh> const&, Foam::word const&) in "/opt/openfoam220/platforms/linuxGccDPOpt/lib/libincompressibleTransportModels.so"
#9  
 in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"
#10  __libc_start_main in "/lib/i386-linux-gnu/libc.so.6"
#11  
 in "/opt/openfoam220/platforms/linuxGccDPOpt/bin/interFoam"

Why zeroGradient cannot be specified?

Thanks in advance.
shuoxue