Files
OpenFOAM-6/applications/solvers/multiphase/reactingEulerFoam/functionObjects/sizeDistribution/sizeDistribution.H
Henry Weller 3e577d8515 reactingEulerFoam: Added population balance modeling capability
This patch enables the reactingEulerFoam solvers to simulate polydisperse flow
situations, i.e. flows where the disperse phase is subject to a size
distribution.

The newly added populationBalanceModel class solves the integro-partial
differential population balance equation (PBE) by means of a class method, also
called discrete or sectional method. This approach is based on discretizing the
PBE over its internal coordinate, the particle volume. This yields a set of
transport equations for the number concentration of particles in classes with a
different representative size. These are coupled through their source-terms and
solved in a segregated manner. The implementation is done in a way, that the
total particle number and mass is preserved for coalescence, breakup and drift
(i.e. isothermal growth or phase change) processes, irrespective of the chosen
discretization over the internal coordinate.

A population balance can be split over multiple velocity (temperature) fields,
using the capability of reactingMultiphaseEulerFoam to solve for n momentum
(energy) equations. To a certain degree, this takes into account the dependency
of heat- and momentum transfer on the disperse phase diameter. It is also possible
to define multiple population balances, e.g. bubbles and droplets simultaneously.

The functionality can be switched on by choosing the appropriate phaseSystem
type, e.g. populationBalanceMultiphaseSystem and the newly added diameterModel
class called velocityGroup. To illustrate the use of the functionality, a
bubbleColumnPolydisperse tutorial was added for reactingTwoPhaseEulerFoam and
reactingMultiphaseEulerFoam.

Furthermore, a reactingEulerFoam-specific functionObject called sizeDistribution
was added to allow post-Processing of the size distribution, e.g. to obtain the
number density function in a specific region.

Patch contributed by Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden - Rossendorf
(HZDR) and VTT Technical Research Centre of Finland Ltd.
2017-12-31 19:59:47 +00:00

281 lines
7.3 KiB
C++

/*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration |
\\ / A nd | Copyright (C) 2011-2017 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
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along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::functionObjects::sizeDistribution
Group
grpreactingEulerFoamFunctionObjects
Description
This function object calculates and outputs information on the
sizeDistribution as calculated by the populationBalanceModel class
implemented in the reactionEulerFoam solver suite. It is build up very
similar to the fieldValue/volRegion functionObjects, since it must be
possible to obtain information about the populationBalanceModel within a
defined region.
Example of function object specification:
\verbatim
box.all.numberDensity.volume.bubbles
{
type sizeDistribution;
libs ("libreactingEulerFoamFunctionObjects.so");
writeControl outputTime;
writeInterval 1;
log true;
...
functionType numberDensity;
abszissaType volume;
regionType all;
populationBalanceModel bubbles;
normalize true;
}
\endverbatim
Usage
\table
Property | Description | Required | Default value
type | type name: sizeDistribution | yes |
functionType | numberDensity, volumeDensity, numberConcentration,
moments | yes |
abszissaType | volume, diameter | yes |
momentOrder | Write moment up to given order | no | 0
regionType | Evaluate for cellZone or entire mesh | yes |
cellZoneName | Required if regionType is cellZone | |
populationBalanceModel | Respective populationBalanceModel | yes |
normalize | Normalization | no |
\endtable
See also
Foam::diameterModels::populationBalanceModel
Foam::functionObjects::fvMeshFunctionObject
Foam::functionObjects::logFiles
Foam::functionObject
SourceFiles
sizeDistribution.C
\*---------------------------------------------------------------------------*/
#ifndef functionObjects_sizeDistribution_H
#define functionObjects_sizeDistribution_H
#include "fvMeshFunctionObject.H"
#include "logFiles.H"
#include "populationBalanceModel.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
// Forward declaration of classes
class fvMesh;
namespace functionObjects
{
/*---------------------------------------------------------------------------*\
Class sizeDistribution Declaration
\*---------------------------------------------------------------------------*/
class sizeDistribution
:
public fvMeshFunctionObject,
public logFiles
{
public:
// Public data types
//- Region type enumeration
enum regionTypes
{
rtCellZone,
rtAll
};
//- Region type names
static const NamedEnum<regionTypes, 2> regionTypeNames_;
//- Function type enumeration
enum functionTypes
{
ftNdf,
ftVdf,
ftNc,
ftMom
};
//- Function type names
static const NamedEnum<functionTypes, 4> functionTypeNames_;
//- abszissa type enumeration
enum abszissaTypes
{
atDiameter,
atVolume,
};
//- Abszissa type names
static const NamedEnum<abszissaTypes, 2> abszissaTypeNames_;
protected:
// Protected data
//- Construction dictionary
dictionary dict_;
//- Region type
regionTypes regionType_;
//- Name of region
word regionName_;
//- Function type
functionTypes functionType_;
//- Abszissa type
abszissaTypes abszissaType_;
//- Global number of cells
label nCells_;
//- Local list of cell IDs
labelList cellId_;
//- Total volume of the evaluated region
scalar volume_;
//- Optionally write the volume of the sizeDistribution
bool writeVolume_;
//- PopulationBalance
const Foam::diameterModels::populationBalanceModel& popBal_;
//- Number concentrations
List<scalar> N_;
//- Write moments up to spezified order with respect to abszissaType
label momentOrder_;
//- Normalization switch
const Switch normalize_;
//- Sum of number concentrations
scalar sumN_;
//- Volumertic sum
scalar sumV_;
// Protected Member Functions
//- Initialise, e.g. cell addressing
void initialise(const dictionary& dict);
//- Set cells to evaluate based on a cell zone
void setCellZoneCells();
//- Calculate and return volume of the evaluated cell zone
scalar volume() const;
//- Combine fields from all processor domains into single field
void combineFields(scalarField& field);
//- Filter field according to cellIds
tmp<scalarField> filterField(const scalarField& field) const;
//- Output file header information
virtual void writeFileHeader(const label i);
public:
//- Runtime type information
TypeName("sizeDistribution");
// Constructors
//- Construct from Time and dictionary
sizeDistribution
(
const word& name,
const Time& runTime,
const dictionary& dict
);
//- Destructor
virtual ~sizeDistribution();
// Member Functions
//- Return the reference to the construction dictionary
const dictionary& dict() const
{
return dict_;
}
//- Return the local list of cell IDs
const labelList& cellId() const
{
return cellId_;
}
//- Helper function to return the reference to the mesh
const fvMesh& mesh() const
{
return refCast<const fvMesh>(obr_);
}
//- Read from dictionary
virtual bool read(const dictionary& dict);
//- Execute
virtual bool execute();
//- Write
virtual bool write();
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace functionObjects
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //