File size: 6,119 Bytes
5a600cf | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 | /*---------------------------------------------------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2025 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
Class
Foam::flowRateNumberLagrangianScalarFieldSource
Description
This source condition sets the values of the number field to recover a
specified volumetric or mass flow-rate. It should be used in conjunction
with a continuous injection model.
This condition requires a uniform size to be specified. All injected
parcels will have the same value of this size. The size can be \c number,
\c surfaceArea, \c volume or \c mass. This choice relates to the desired
discretisation of the Lagrangian material. Broadly, the uniform size chosen
should be that against which the dominant effect of the Lagrangian model
scales.
So, if the particles are primarily evaporating droplets of fuel, then the
effect of each will be primarily a function of the mass of fuel that
evaporates into the system. The \c uniformSize should therefore be set to
\c mass.
But, if the model is purely dynamic, and the dominant effect is viscous
drag, then each particle will exert a force in proportion with a reference
area. In this case \c surfaceArea would be a better choice.
If a distribution of sizes is injected then the choice of uniform size
interacts with how the distribution is to be sampled. For that reason, it
is important to use a diameter source condition such as \c
distributionDiameter which accounts for this, rather than the general \c
distribution condition.
Usage
\table
Property | Description | Required? | Default
uniformSize | The size kept uniform \
across all parcels | yes |
volumetricFlowRate | The volumetric flow rate | if massFlowRate \
is not specified |
massFlowRate | The mass flow rate | if volumetricFlowRate \
is not specified |
\endtable
Example specification:
\verbatim
<LagrangianModelName>
{
type flowRateNumber;
uniformSize volume; // number, surfaceArea, mass
volumetricFlowRate 1 [ml/s];
}
\endverbatim
See also
Foam::distributionDiameterLagrangianScalarFieldSource
SourceFiles
flowRateNumberLagrangianScalarFieldSource.C
\*---------------------------------------------------------------------------*/
#ifndef flowRateNumberLagrangianScalarFieldSource_H
#define flowRateNumberLagrangianScalarFieldSource_H
#include "uniformSizeNumberLagrangianScalarFieldSource.H"
#include "Function1.H"
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
namespace Foam
{
/*---------------------------------------------------------------------------*\
Class flowRateNumberLagrangianScalarFieldSource Declaration
\*---------------------------------------------------------------------------*/
class flowRateNumberLagrangianScalarFieldSource
:
public uniformSizeNumberLagrangianScalarFieldSource
{
private:
// Private Data
//- The volumetric flow rate
autoPtr<Function1<scalar>> volumetricFlowRate_;
//- The mass flow rate
autoPtr<Function1<scalar>> massFlowRate_;
public:
//- Runtime type information
TypeName("flowRateNumber");
// Constructors
//- Construct from internal field and dictionary
flowRateNumberLagrangianScalarFieldSource
(
const regIOobject&,
const dictionary& dict
);
//- Copy constructor setting the internal field reference
flowRateNumberLagrangianScalarFieldSource
(
const flowRateNumberLagrangianScalarFieldSource&,
const regIOobject&
);
//- Construct and return a clone setting the internal field reference
virtual autoPtr<LagrangianScalarFieldSource> clone
(
const regIOobject& iIo
) const
{
return autoPtr<LagrangianScalarFieldSource>
(
new flowRateNumberLagrangianScalarFieldSource(*this, iIo)
);
}
//- Destructor
virtual ~flowRateNumberLagrangianScalarFieldSource();
// Member Functions
//- Return the volumetric flow rate for this time-step
dimensionedScalar Q
(
const LagrangianInjection&,
const LagrangianSubMesh&
) const;
//- Return the value for an instantaneous injection
virtual tmp<LagrangianSubScalarField> value
(
const LagrangianInjection&,
const LagrangianSubMesh&
) const;
//- Write
virtual void write(Ostream&) const;
};
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
} // End namespace Foam
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
#endif
// ************************************************************************* //
|