[mb.pejvak]

I am using interDyMFoam as a solve and I want to have dynamic mesh rifinement based on velocity. The dynamicMeshDict is as follows:

 



/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.0.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.com                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      dynamicMeshDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dynamicFvMesh   dynamicRefineFvMesh;

dynamicRefineFvMeshCoeffs
{
    // How often to refine
    refineInterval  1;
    // Field to be refinement on
    field U;
    // Refine field between lower..upper
    lowerRefineLevel 0.0
    upperRefineLevel 0.001;
    // If value < unrefineLevel unrefine
    unrefineLevel   0.1;
    // Have slower than 2:1 refinement
    nBufferLayers   24;
    // Refine cells only up to maxRefinement levels
    maxRefinement   2;
    // Stop refinement if maxCells reached
    maxCells        100000000;

    // Stop autorefinement after n timesteps
    maxTimeAutoRefine   -1;

    // Flux field and corresponding velocity field. Fluxes on changed
    // faces get recalculated by interpolating the velocity. Use 'none'
    // on surfaceScalarFields that do not need to be reinterpolated.
    correctFluxes
    (
        (phi_0 U)
        (phi U)
    );
    // Write the refinement level as a volScalarField
    dumpLevel       false;
}


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

But when I run the case I got the error

  it is not a volScalarField, it is a volVectorField