8a5ee8aac1
The MomentumTransportModels library now builds of a standard set of phase-incompressible and phase-compressible models. This replaces most solver-specific builds of these models. This has been made possible by the addition of a new "dynamicTransportModel" interface, from which all transport classes used by the momentum transport models now derive. For the purpose of disambiguation, the old "transportModel" has also been renamed "kinematicTransportModel". This change has been made in order to create a consistent definition of phase-incompressible and phase-compressible MomentumTransportModels, which can then be looked up by functionObjects, fvModels, and similar. Some solvers still build specific momentum transport models, but these are now in addition to the standard set. The solver does not build all the models it uses. There are also corresponding centralised builds of phase dependent ThermophysicalTransportModels.
254 lines
7.0 KiB
C++
254 lines
7.0 KiB
C++
/*---------------------------------------------------------------------------*\
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========= |
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\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
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\\ / O peration | Website: https://openfoam.org
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\\ / A nd | Copyright (C) 2011-2021 OpenFOAM Foundation
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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
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the Free Software Foundation, either version 3 of the License, or
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(at your 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, see <http://www.gnu.org/licenses/>.
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Class
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Foam::XiModel
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Description
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Base-class for all Xi models used by the b-Xi combustion model.
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See Technical Report SH/RE/01R for details on the PDR modelling.
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Xi is given through an algebraic expression (\link algebraic.H \endlink),
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by solving a transport equation (\link transport.H \endlink) or a
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fixed value (\link fixed.H \endlink).
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See report TR/HGW/10 for details on the Weller two equations model.
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In the algebraic and transport methods \f$\Xi_{eq}\f$ is calculated in
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similar way. In the algebraic approach, \f$\Xi_{eq}\f$ is the value used in
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the \f$ b \f$ transport equation.
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\f$\Xi_{eq}\f$ is calculated as follows:
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\f$\Xi_{eq} = 1 + (1 + 2\Xi_{coeff}(0.5 - \dwea{b}))(\Xi^* - 1)\f$
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where:
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\f$ \dwea{b} \f$ is the regress variable.
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\f$ \Xi_{coeff} \f$ is a model constant.
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\f$ \Xi^* \f$ is the total equilibrium wrinkling combining the effects
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of the flame instability and turbulence interaction and is given by
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\f[
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\Xi^* = \frac {R}{R - G_\eta - G_{in}}
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\f]
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where:
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\f$ G_\eta \f$ is the generation rate of wrinkling due to turbulence
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interaction.
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\f$ G_{in} = \kappa \rho_{u}/\rho_{b} \f$ is the generation
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rate due to the flame instability.
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By adding the removal rates of the two effects:
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\f[
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R = G_\eta \frac{\Xi_{\eta_{eq}}}{\Xi_{\eta_{eq}} - 1}
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+ G_{in} \frac{\Xi_{{in}_{eq}}}{\Xi_{{in}_{eq}} - 1}
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\f]
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where:
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\f$ R \f$ is the total removal.
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\f$ G_\eta \f$ is a model constant.
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\f$ \Xi_{\eta_{eq}} \f$ is the flame wrinkling due to turbulence.
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\f$ \Xi_{{in}_{eq}} \f$ is the equilibrium level of the flame wrinkling
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generated by instability. It is a constant (default 2.5).
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SourceFiles
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XiModel.C
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\*---------------------------------------------------------------------------*/
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#ifndef XiModel_H
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#define XiModel_H
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#include "IOdictionary.H"
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#include "psiuReactionThermo.H"
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#include "dynamicMomentumTransportModel.H"
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#include "multivariateSurfaceInterpolationScheme.H"
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#include "fvcDiv.H"
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#include "runTimeSelectionTables.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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/*---------------------------------------------------------------------------*\
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Class XiModel Declaration
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\*---------------------------------------------------------------------------*/
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class XiModel
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{
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protected:
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// Protected data
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dictionary XiModelCoeffs_;
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const psiuReactionThermo& thermo_;
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const compressible::RASModel& turbulence_;
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const volScalarField& Su_;
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const volScalarField& rho_;
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const volScalarField& b_;
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const surfaceScalarField& phi_;
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//- Flame wrinkling field
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volScalarField Xi_;
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public:
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//- Runtime type information
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TypeName("XiModel");
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// Declare run-time constructor selection table
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declareRunTimeSelectionTable
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(
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autoPtr,
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XiModel,
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dictionary,
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(
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const dictionary& XiProperties,
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const psiuReactionThermo& thermo,
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const compressible::RASModel& turbulence,
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const volScalarField& Su,
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const volScalarField& rho,
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const volScalarField& b,
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const surfaceScalarField& phi
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),
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(
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XiProperties,
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thermo,
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turbulence,
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Su,
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rho,
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b,
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phi
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)
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);
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// Constructors
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//- Construct from components
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XiModel
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(
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const dictionary& XiProperties,
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const psiuReactionThermo& thermo,
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const compressible::RASModel& turbulence,
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const volScalarField& Su,
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const volScalarField& rho,
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const volScalarField& b,
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const surfaceScalarField& phi
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);
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//- Disallow default bitwise copy construction
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XiModel(const XiModel&);
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// Selectors
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//- Return a reference to the selected Xi model
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static autoPtr<XiModel> New
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(
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const dictionary& XiProperties,
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const psiuReactionThermo& thermo,
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const compressible::RASModel& turbulence,
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const volScalarField& Su,
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const volScalarField& rho,
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const volScalarField& b,
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const surfaceScalarField& phi
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);
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//- Destructor
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virtual ~XiModel();
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// Member Functions
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//- Return the flame-wrinkling Xi
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virtual const volScalarField& Xi() const
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{
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return Xi_;
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}
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//- Return the flame diffusivity
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virtual tmp<volScalarField> Db() const
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{
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return turbulence_.muEff();
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}
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//- Add Xi to the multivariateSurfaceInterpolationScheme table
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// if required
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virtual void addXi
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(
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multivariateSurfaceInterpolationScheme<scalar>::fieldTable&
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)
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{}
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//- Correct the flame-wrinkling Xi
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virtual void correct() = 0;
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//- Correct the flame-wrinkling Xi using the given convection scheme
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virtual void correct(const fv::convectionScheme<scalar>&)
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{
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correct();
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}
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//- Update properties from given dictionary
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virtual bool read(const dictionary& XiProperties) = 0;
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//- Write fields related to Xi model
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virtual void writeFields() = 0;
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// Member Operators
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//- Disallow default bitwise assignment
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void operator=(const XiModel&) = delete;
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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