b8d15ba459
by introducing rational base-classes rather than using the hideous 'switch' statement. Further rationalization of the cell-selection mechanism will be implemented via an appropriate class hierarchy to replace the remaining 'switch' statement. Mesh-motion is currently handled very inefficiently for cellSets and not at all for inter-region coupling. The former will be improved when the cell-selection classes are written and the latter by making the meshToMesh class a MeshObject after it has been corrected for mapFields.
281 lines
8.4 KiB
C++
281 lines
8.4 KiB
C++
/*---------------------------------------------------------------------------*\
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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 (C) 2014-2015 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::fv::solidificationMeltingSource
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Description
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This source is designed to model the effect of solidification and melting
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processes, e.g. windhield defrosting. The phase change occurs at the
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melting temperature, \c Tmelt.
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The presence of the solid phase in the flow field is incorporated into the
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model as a momentum porosity contribution; the energy associated with the
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phase change is added as an enthalpy contribution.
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Based on the references:
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1. V.R. Voller and C. Prakash, A fixed grid numerical modelling
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methodology for convection-diffusion mushy phase-change problems,
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Int. J. Heat Mass Transfer 30(8):17091719, 1987.
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2. C.R. Swaminathan. and V.R. Voller, A general enthalpy model for
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modeling solidification processes, Metallurgical Transactions
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23B:651664, 1992.
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The model generates a field \c \<name\>:alpha1 which can be visualised to
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to show the melt distribution as a fraction [0-1]
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\heading Source usage
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Example usage:
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\verbatim
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solidificationMeltingSource1
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{
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type solidificationMeltingSource;
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active yes;
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solidificationMeltingSourceCoeffs
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{
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selectionMode cellZone;
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cellZone iceZone;
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Tmelt 273;
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L 334000;
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thermoMode thermo;
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beta 50e-6;
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rhoRef 800;
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}
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}
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\endverbatim
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Where:
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\table
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Property | Description | Required | Default value
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Tmelt | Melting temperature [K] | yes |
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L | Latent heat of fusion [J/kg] | yes |
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relax | Relaxation coefficient [0-1] | no | 0.9
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thermoMode | Thermo mode [thermo|lookup] | yes |
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rhoRef | Reference (solid) density | yes |
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rhoName | Name of density field | no | rho
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TName | Name of temperature field | no | T
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CpName | Name of specific heat capacity field | no | Cp
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UName | Name of velocity field | no | U
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phiName | Name of flux field | no | phi
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Cu | Model coefficient | no | 100000
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q | Model coefficient | no | 0.001
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beta | Thermal expansion coefficient [1/K] | yes |
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g | Accelerartion due to gravity | no |
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\endtable
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SourceFiles
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solidificationMeltingSource.C
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solidificationMeltingSourceIO.C
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\*---------------------------------------------------------------------------*/
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#ifndef solidificationMeltingSource_H
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#define solidificationMeltingSource_H
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#include "fvMesh.H"
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#include "volFields.H"
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#include "cellSetOption.H"
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#include "NamedEnum.H"
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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namespace Foam
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{
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namespace fv
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{
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/*---------------------------------------------------------------------------*\
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Class solidificationMeltingSource Declaration
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\*---------------------------------------------------------------------------*/
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class solidificationMeltingSource
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:
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public cellSetOption
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{
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public:
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enum thermoMode
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{
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mdThermo,
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mdLookup
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};
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static const NamedEnum<thermoMode, 2> thermoModeTypeNames_;
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private:
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// Private data
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//- Temperature at which melting occurs [K]
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scalar Tmelt_;
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//- Latent heat of fusion [J/kg]
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scalar L_;
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//- Phase fraction under-relaxation coefficient
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scalar relax_;
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//- Thermodynamics mode
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thermoMode mode_;
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//- Reference density - typically the solid density
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scalar rhoRef_;
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//- Name of temperature field - default = "T" (optional)
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word TName_;
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//- Name of specific heat capacity field - default = "Cp" (optional)
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word CpName_;
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//- Name of velocity field - default = "U" (optional)
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word UName_;
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//- Name of flux field - default = "phi" (optional)
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word phiName_;
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//- Mushy region momentum sink coefficient [1/s]; default = 10^5
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scalar Cu_;
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//- Coefficient used in porosity calc - default = 0.001
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scalar q_;
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//- Thermal expansion coefficient [1/K]
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scalar beta_;
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//- Phase fraction indicator field
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volScalarField alpha1_;
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//- Current time index (used for updating)
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label curTimeIndex_;
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//- Temperature change cached for source calculation when alpha1 updated
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scalarField deltaT_;
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// Private Member Functions
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//- Flag to indicate whether to solve for given field
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bool solveField(const word& fieldName) const;
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//- Return the specific heat capacity field
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tmp<volScalarField> Cp() const;
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//- Return the gravity vector
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vector g() const;
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//- Update the model
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void update(const volScalarField& Cp);
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//- Helper function to apply to the energy equation
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template<class RhoFieldType>
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void apply(const RhoFieldType& rho, fvMatrix<scalar>& eqn);
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//- Disallow default bitwise copy construct
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solidificationMeltingSource(const solidificationMeltingSource&);
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//- Disallow default bitwise assignment
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void operator=(const solidificationMeltingSource&);
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public:
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//- Runtime type information
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TypeName("solidificationMeltingSource");
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// Constructors
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//- Construct from explicit source name and mesh
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solidificationMeltingSource
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(
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const word& sourceName,
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const word& modelType,
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const dictionary& dict,
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const fvMesh& mesh
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);
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// Member Functions
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//- Flag to bypass the apply flag list checking
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virtual bool alwaysApply() const;
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// Add explicit and implicit contributions
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//- Add explicit contribution to enthalpy equation
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virtual void addSup(fvMatrix<scalar>& eqn, const label fieldI);
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//- Add implicit contribution to momentum equation
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virtual void addSup(fvMatrix<vector>& eqn, const label fieldI);
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// Add explicit and implicit contributions to compressible equation
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//- Add explicit contribution to compressible enthalpy equation
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virtual void addSup
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(
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const volScalarField& rho,
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fvMatrix<scalar>& eqn,
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const label fieldI
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);
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//- Add implicit contribution to compressible momentum equation
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virtual void addSup
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(
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const volScalarField& rho,
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fvMatrix<vector>& eqn,
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const label fieldI
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);
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// I-O
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//- Write the source properties
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virtual void writeData(Ostream&) const;
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//- Read source dictionary
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virtual bool read(const dictionary& dict);
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};
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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} // End namespace fv
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} // End namespace Foam
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#ifdef NoRepository
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#include "solidificationMeltingSourceTemplates.C"
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#endif
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// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
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#endif
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// ************************************************************************* //
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