157 lines
4 KiB
C
157 lines
4 KiB
C
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/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration |
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\\ / A nd | Copyright held by original author
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\\/ M anipulation |
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-------------------------------------------------------------------------------
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License
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This file is part of OpenFOAM.
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OpenFOAM is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with OpenFOAM; if not, write to the Free Software Foundation,
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Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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Class
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Foam::XiEqModels::basicSubGrid
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Description
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Basic sub-grid obstacle flame-wrinking enhancement factor model.
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Details supplied by J Puttock 2/7/06.
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<b> Sub-grid flame area generation </b>
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\f$ n = N - \hat{\dwea{\vec{U}}}.n_{s}.\hat{\dwea{\vec{U}}} \f$
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\f$ n_{r} = \sqrt{n} \f$
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where:
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\f$ \hat{\dwea{\vec{U}}} = \dwea{\vec{U}} / \vert \dwea{\vec{U}}
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\vert \f$
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\f$ b = \hat{\dwea{\vec{U}}}.B.\hat{\dwea{\vec{U}}} / n_{r} \f$
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where:
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\f$ B \f$ is the file "B".
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\f$ N \f$ is the file "N".
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\f$ n_{s} \f$ is the file "ns".
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The flame area enhancement factor \f$ \Xi_{sub} \f$ is expected to
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approach:
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\f[
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\Xi_{{sub}_{eq}} =
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1 + max(2.2 \sqrt{b}, min(0.34 \frac{\vert \dwea{\vec{U}}
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\vert}{{\vec{U}}^{'}}, 1.6)) \times min(\frac{n}{4}, 1)
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\f]
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SourceFiles
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basicSubGrid.C
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\*---------------------------------------------------------------------------*/
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#ifndef basicSubGrid_H
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#define basicSubGrid_H
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#include "XiEqModel.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace XiEqModels
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{
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/*---------------------------------------------------------------------------*\
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Class basicSubGrid Declaration
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\*---------------------------------------------------------------------------*/
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class basicSubGrid
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:
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public XiEqModel
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{
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// Private data
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//- Count
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volScalarField N_;
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//- Sub-count
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volSymmTensorField ns_;
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//- tblock
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volSymmTensorField B_;
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//- Typical obstacle diameters per cell
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volScalarField Lobs_;
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//- Equilibrium Xi model due to turbulence
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autoPtr<XiEqModel> XiEqModel_;
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// Private Member Functions
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//- Disallow copy construct
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basicSubGrid(const basicSubGrid&);
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//- Disallow default bitwise assignment
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void operator=(const basicSubGrid&);
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public:
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//- Runtime type information
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TypeName("basicSubGrid");
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// Constructors
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//- Construct from components
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basicSubGrid
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(
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const dictionary& XiEqProperties,
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const hhuCombustionThermo& thermo,
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const compressible::RASModel& turbulence,
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const volScalarField& Su
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);
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// Destructor
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virtual ~basicSubGrid();
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// Member Functions
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//- Return the flame-wrinking XiEq
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virtual tmp<volScalarField> XiEq() const;
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//- Update properties from given dictionary
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virtual bool read(const dictionary& XiEqProperties);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace XiEqModels
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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