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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2025-2026 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/>.
\*---------------------------------------------------------------------------*/
#include "pointInjection.H"
#include "addToRunTimeSelectionTable.H"
#include "LagrangianFields.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
namespace Lagrangian
{
defineTypeNameAndDebug(pointInjection, 0);
addToRunTimeSelectionTable(LagrangianModel, pointInjection, dictionary);
}
}
// * * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * //
void Foam::Lagrangian::pointInjection::readCoeffs(const dictionary& modelDict)
{
point_.reset
(
Function1<vector>::New
(
"point",
mesh().time().userUnits(),
dimensions::length,
modelDict
).ptr()
);
numberRate_.reset
(
Function1<scalar>::New
(
"numberRate",
mesh().time().userUnits(),
dimensions::rate,
modelDict
).ptr()
);
numberDeferred_ = 0;
injectionLocation_ = injectionLocation::unset;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::Lagrangian::pointInjection::pointInjection
(
const word& name,
const LagrangianMesh& mesh,
const dictionary& modelDict,
const dictionary& stateDict
)
:
LagrangianInjection(name, mesh),
point_(nullptr),
numberRate_(nullptr),
numberDeferred_(stateDict.lookupOrDefault<scalar>("numberDeferred", 0)),
rndGen_("rndGen", stateDict, name, true),
timeIndex_(-1),
injectionLocation_(injectionLocation::unset),
coordinates_(barycentric::uniform(NaN)),
celli_(-1),
facei_(-1),
faceTrii_(-1)
{
readCoeffs(modelDict);
}
// * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
void Foam::Lagrangian::pointInjection::correct()
{
// If anything is moving then all coordinates have to be constructed on the
// fly, so don't store anything
if (mesh().poly().moving() || !point_->constant())
{
injectionLocation_ =
injectionLocation::multiplePoints;
}
// If nothing is moving, and coordinates are not already stored, then
// construct and store the coordinates for repeated usage
if
(
injectionLocation_ == injectionLocation::unset
|| injectionLocation_ == injectionLocation::multiplePoints
)
{
const scalar t1 = mesh().time().value();
const scalar t0 = t1 - mesh().time().deltaT().value();
// Evaluate the position
const point p = point_->value(t0);
// Locate within the mesh
const LagrangianMesh::location l =
mesh().locate(p, coordinates_, celli_, facei_, faceTrii_, 0);
// Check for failure
checkLocation(l, p);
// Set the location flag
injectionLocation_ =
celli_ >= 0
? injectionLocation::fixedPointOnThisProcessor
: injectionLocation::fixedPointOnAnotherProcessor;
}
}
Foam::LagrangianSubMesh Foam::Lagrangian::pointInjection::modify
(
LagrangianMesh& mesh,
const LagrangianSubMesh&
) const
{
const scalar t1 = mesh.time().value();
const scalar t0 = t1 - mesh.time().deltaT().value();
// Restart the generator if necessary and set the time index up to date
rndGen_.start(timeIndex_ == time().timeIndex());
timeIndex_ = time().timeIndex();
// Calculate the number of particles to inject. Round down to get an
// integer number. Store the excess to apply at a later time.
const scalar number = numberRate_->integral(t0, t1) + numberDeferred_;
const label numberInt = floor(number);
numberDeferred_ = number - numberInt;
// Inject at random times throughout the time-step
scalarField fraction(rndGen_.scalar01(numberInt));
// Create particles in the Lagrangian mesh
switch (injectionLocation_)
{
case injectionLocation::unset:
FatalErrorInFunction
<< "Injection location has not been set"
<< exit(FatalError);
return LagrangianSubMesh(mesh, LagrangianGroup::none, -1, -1);
case injectionLocation::fixedPointOnThisProcessor:
{
// Use stored coordinates to inject the particles
return
mesh.inject
(
*this,
barycentricField(numberInt, coordinates_),
labelField(numberInt, celli_),
labelField(numberInt, facei_),
labelField(numberInt, faceTrii_),
LagrangianMesh::fractionName,
fraction
);
}
case injectionLocation::fixedPointOnAnotherProcessor:
{
// Inject nothing. We need this because source conditions evaluated
// on the process containing the point may communicate; e.g., to
// sum the flow rate across the processes.
return
mesh.inject
(
*this,
barycentricField(),
labelField(),
labelField(),
labelField(),
LagrangianMesh::fractionName,
scalarField()
);
}
case injectionLocation::multiplePoints:
{
// Evaluate the variable positions
const pointField positions(point_->value(t0 + fraction*(t1 - t0)));
// Locate within the moving mesh
barycentricField coordinates(numberInt);
labelField celli(numberInt), facei(numberInt), faceTrii(numberInt);
const List<LagrangianMesh::location> locations =
mesh.locate
(
positions,
coordinates,
celli,
facei,
faceTrii,
fraction
);
// Check for any failures
checkLocation(locations, positions);
// Remove particles not on this process
filter(coordinates, celli, facei, faceTrii, fraction);
// Inject particles
return
mesh.inject
(
*this,
coordinates,
celli,
facei,
faceTrii,
LagrangianMesh::fractionName,
fraction
);
}
}
return LagrangianSubMesh(mesh, LagrangianGroup::none, -1, -1);
}
void Foam::Lagrangian::pointInjection::topoChange(const polyTopoChangeMap&)
{
injectionLocation_ = injectionLocation::unset;
}
void Foam::Lagrangian::pointInjection::mapMesh(const polyMeshMap&)
{
injectionLocation_ = injectionLocation::unset;
}
void Foam::Lagrangian::pointInjection::distribute(const polyDistributionMap&)
{
injectionLocation_ = injectionLocation::unset;
}
bool Foam::Lagrangian::pointInjection::read(const dictionary& modelDict)
{
if (LagrangianInjection::read(modelDict))
{
readCoeffs(modelDict);
return true;
}
else
{
return false;
}
}
void Foam::Lagrangian::pointInjection::writeState(Ostream& os) const
{
LagrangianInjection::writeState(os);
writeEntry(os, "numberDeferred", numberDeferred_);
writeEntry(os, "rndGen", rndGen_);
}
// ************************************************************************* //
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