basicXiSubXiEq.H

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    Copyright (C) 2011-2012 OpenFOAM Foundation
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License
    This file is part of OpenFOAM.
 
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Class
    Foam::XiEqModels::basicSubGrid
 
Description
    Basic sub-grid obstacle flame-wrinkling enhancement factor model.
    Details supplied by J Puttock 2/7/06.
 
    <b> Sub-grid flame area generation </b>
 
    \f$ n = N - \hat{\dwea{\vec{U}}}.n_{s}.\hat{\dwea{\vec{U}}} \f$
    \f$ n_{r} = \sqrt{n} \f$
 
    where:
 
        \f$ \hat{\dwea{\vec{U}}} = \dwea{\vec{U}} / \vert \dwea{\vec{U}}
        \vert \f$
 
        \f$ b = \hat{\dwea{\vec{U}}}.B.\hat{\dwea{\vec{U}}} / n_{r} \f$
 
    where:
 
        \f$ B \f$ is the file "B".
 
        \f$ N \f$ is the file "N".
 
        \f$  n_{s} \f$ is the file "ns".
 
    The flame area enhancement factor \f$ \Xi_{sub} \f$ is expected to
    approach:
 
    \f[
        \Xi_{{sub}_{eq}} =
            1 + max(2.2 \sqrt{b}, min(0.34 \frac{\vert \dwea{\vec{U}}
            \vert}{{\vec{U}}^{'}}, 1.6)) \times min(\frac{n}{4}, 1)
    \f]
 
 
SourceFiles
    basicSubGrid.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef basicSubGrid_H
#define basicSubGrid_H
 
#include "XiEqModel.H"
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
namespace XiEqModels
{
 
/*---------------------------------------------------------------------------*\
                          Class basicSubGrid Declaration
\*---------------------------------------------------------------------------*/
 
class basicSubGrid
:
    public XiEqModel
{
    // Private data
 
        //- tblock
        volSymmTensorField B_;
 
        //- Equilibrium Xi model due to turbulence
        autoPtr<XiEqModel> XiEqModel_;
 
 
    // Private Member Functions
 
        //- No copy construct
        basicSubGrid(const basicSubGrid&) = delete;
 
        //- No copy assignment
        void operator=(const basicSubGrid&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeName("basicSubGrid");
 
 
    // Constructors
 
        //- Construct from components
        basicSubGrid
        (
            const dictionary& XiEqProperties,
            const psiuReactionThermo& thermo,
            const compressible::RASModel& turbulence,
            const volScalarField& Su
        );
 
 
    //- Destructor
    virtual ~basicSubGrid();
 
 
    // Member Functions
 
        //- Return the flame-wrinkling XiEq
        virtual tmp<volScalarField> XiEq() const;
 
        //- Update properties from given dictionary
        virtual bool read(const dictionary& XiEqProperties);
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace XiEqModels
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //