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/* This file is part of the OpenLB library
*
* Copyright (C) 2017 Max Gaedtke, Albert Mink
* E-mail contact: info@openlb.net
* The most recent release of OpenLB can be downloaded at
* <http://www.openlb.net/>
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free
* Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/** \file
* Unit conversion handling -- header file.
*/
#ifndef RADIATIVEUNITCONVERTER_H
#define RADIATIVEUNITCONVERTER_H
#include "io/ostreamManager.h"
#include "core/unitConverter.h"
/// All OpenLB code is contained in this namespace.
namespace olb {
double getThetaRefracted(double const& thetaIncident, double const& refractiveRelative);
double getFresnelFunction(double const& theta, double const& refractiveRelative);
double R_phi_diff (double const& theta, double const& refractiveRelative);
double R_j_diff (double const& theta, double const& refractiveRelative);
double getRefractionFunction(const double& refractiveRelative);
double getRefractionFunction(const double& refractiveRelative);
double getPartialBBCoefficient(double const& latticeDiffusionCoefficient, double const& relativeRefractiveIndex );
// forward declaration
template<typename T, typename DESCRIPTOR> class RadiativeUnitConverter;
// wrapper for above function
template <typename T, typename DESCRIPTOR>
double getPartialBBCoefficient(RadiativeUnitConverter<T,DESCRIPTOR> const& converter)
{
return getPartialBBCoefficient( converter.getLatticeDiffusion(), converter.getRefractiveRelative() );
};
// wrapper for above function
template <typename T, typename DESCRIPTOR>
double getRefractionFunction(RadiativeUnitConverter<T,DESCRIPTOR> const& converter)
{
return getRefractionFunction(converter.getRefractiveRelative());
};
/** Conversion between physical and lattice units, as well as discretization.
* Be aware of the nomenclature:
* We distingish between physical (dimensioned) and lattice (dimensionless) values.
* A specific conversion factor maps the two different scopes,
* e.g. __physLength = conversionLength * latticeLength__
*
*/
template <typename T, typename DESCRIPTOR>
class RadiativeUnitConverter : public UnitConverterFromResolutionAndRelaxationTime<T,DESCRIPTOR> {
public:
/** Documentation of constructor:
* \param resolution is number of voxel per 1 meter
* \param latticeRelaxationTime see class UnitConverterFromResolutionAndRelaxationTime
* \param physAbsorption physical absorption in 1/meter
* \param physScattering physical scattering in 1/meter
*/
constexpr RadiativeUnitConverter( int resolution, T latticeRelaxationTime, T physAbsorption, T physScattering, T anisotropyFactor=0, T charPhysLength=1, T refractiveMedia=1, T refractiveAmbient=1 )
: UnitConverterFromResolutionAndRelaxationTime<T, DESCRIPTOR>( resolution, latticeRelaxationTime, charPhysLength, T(1), T(1), T(1) ),
clout(std::cout, "RadiativeUnitConverter"),
_physAbsorption(physAbsorption),
_physScattering(physScattering),
_anisotropyFactor(anisotropyFactor),
_extinction( physAbsorption+physScattering ),
_scatteringAlbedo( physScattering/(physAbsorption+physScattering) ),
_physDiffusion( 1.0 / (3.0*(physAbsorption+physScattering)) ),
_effectiveAttenuation( std::sqrt(3*physAbsorption*(physAbsorption+physScattering)) ),
_refractiveRelative(refractiveMedia/refractiveAmbient),
_latticeAbsorption( physAbsorption*this->getConversionFactorLength() ),
_latticeScattering( physScattering*this->getConversionFactorLength() ),
_latticeDiffusion(_physDiffusion/this->getConversionFactorLength())
{ };
constexpr T getPhysAbsorption() const
{
return _physAbsorption;
};
constexpr T getPhysScattering() const
{
return _physScattering;
};
constexpr T getAnisotropyFactor() const
{
return _anisotropyFactor;
};
constexpr T getExtinction() const
{
return _extinction;
};
constexpr T getScatteringAlbedo() const
{
return _scatteringAlbedo;
};
constexpr T getPhysDiffusion() const
{
return _physDiffusion;
};
constexpr T getEffectiveAttenuation() const
{
return _effectiveAttenuation;
};
constexpr T getLatticeAbsorption() const
{
return _latticeAbsorption;
};
constexpr T getLatticeScattering() const
{
return _latticeScattering;
};
constexpr T getLatticeDiffusion() const
{
return _latticeDiffusion;
};
constexpr T getRefractiveRelative() const
{
return _refractiveRelative;
};
void print() const override;
private:
mutable OstreamManager clout;
double _physAbsorption;
double _physScattering;
double _anisotropyFactor;
double _extinction;
double _scatteringAlbedo;
double _physDiffusion;
double _effectiveAttenuation;
double _refractiveRelative;
double _latticeAbsorption;
double _latticeScattering;
double _latticeDiffusion;
};
template <typename T, typename DESCRIPTOR>
void RadiativeUnitConverter<T, DESCRIPTOR>::print() const
{
clout << "----------------- UnitConverter information -----------------" << std::endl;
clout << "-- Parameters:" << std::endl;
clout << "Resolution: N= " << this->getResolution() << std::endl;
clout << "Lattice relaxation frequency: omega= " << this->getLatticeRelaxationFrequency() << std::endl;
clout << "Lattice relaxation time: tau= " << this->getLatticeRelaxationTime() << std::endl;
clout << "Characteristical length(m): charL= " << this->getCharPhysLength() << std::endl;
clout << "Phys. density(kg/m^d): charRho= " << this->getPhysDensity() << std::endl;
clout << "Phys. absorption(1/m): mu_a= " << getPhysAbsorption() << std::endl;
clout << "Phys. scattering(1/m): mu_s= " << getPhysScattering() << std::endl;
clout << "Extinction(1/m): mu_t= " << getExtinction() << std::endl;
clout << "Effective attenuation(1/m): mu_eff= " << getEffectiveAttenuation() << std::endl;
clout << "Phys. diffusion(m): D= " << getPhysDiffusion() << std::endl;
clout << "Single scattering albedo: albedo= " << getScatteringAlbedo() << std::endl;
clout << "Anisotropy factor: g= " << getAnisotropyFactor() << std::endl;
clout << std::endl;
clout << "Lattice diffusion: D^*= " << getLatticeDiffusion() << std::endl;
clout << "Lattice absorption: absorption= " << getLatticeAbsorption() << std::endl;
clout << "Lattice scattering: scattering= " << getLatticeScattering() << std::endl;
clout << "Lattice sink: sink= " << 3./8.*getLatticeAbsorption()*(getLatticeScattering()+getLatticeAbsorption()) << std::endl;
clout << "C_R: " << getRefractionFunction(getRefractiveRelative()) << std::endl;
clout << "r_F: " << getPartialBBCoefficient(getLatticeDiffusion(),getRefractiveRelative()) << std::endl;
clout << std::endl;
clout << "-- Conversion factors:" << std::endl;
clout << "Voxel length(m): physDeltaX= " << this->getConversionFactorLength() << std::endl;
clout << "Time step(s): physDeltaT= " << this->getConversionFactorTime() << std::endl;
clout << "Density factor(kg/m^3): physDensity= " << this->getConversionFactorDensity() << std::endl;
clout << "-------------------------------------------------------------" << std::endl;
}
} // namespace olb
#endif
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