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#ifndef WARPX_MACROSCOPICPROPERTIES_H_
#define WARPX_MACROSCOPICPROPERTIES_H_
#include "MacroscopicProperties_fwd.H"
#include "Utils/WarpXConst.H"
#include <AMReX_Array.H>
#include <AMReX_Extension.H>
#include <AMReX_GpuQualifiers.H>
#include <AMReX_MultiFab.H>
#include <AMReX_Parser.H>
#include <AMReX_REAL.H>
#include <memory>
#include <string>
/**
* \brief This class contains the macroscopic properties of the medium needed to
* evaluate macroscopic Maxwell equation.
*/
class
MacroscopicProperties
{
public:
MacroscopicProperties (); // constructor
/** Read user-defined macroscopic properties. Called in constructor. */
void ReadParameters ();
/** Initialize multifabs storing macroscopic multifabs */
void InitData ();
/** return MultiFab, sigma (conductivity) of the medium. */
amrex::MultiFab& getsigma_mf () {return (*m_sigma_mf);}
/** return MultiFab, epsilon (permittivity) of the medium. */
amrex::MultiFab& getepsilon_mf () {return (*m_eps_mf);}
/** return MultiFab, mu (permeability) of the medium. */
amrex::MultiFab& getmu_mf () {return (*m_mu_mf);}
/** Initializes the Multifabs storing macroscopic properties
* with user-defined functions(x,y,z).
*/
void InitializeMacroMultiFabUsingParser (amrex::MultiFab *macro_mf,
amrex::ParserExecutor<3> const& macro_parser,
int lev);
/** Gpu Vector with index type of the conductivity multifab */
amrex::GpuArray<int, 3> sigma_IndexType;
/** Gpu Vector with index type of the permittivity multifab */
amrex::GpuArray<int, 3> epsilon_IndexType;
/** Gpu Vector with index type of the permeability multifab */
amrex::GpuArray<int, 3> mu_IndexType;
/** Gpu Vector with index type of the Ex multifab */
amrex::GpuArray<int, 3> Ex_IndexType;
/** Gpu Vector with index type of the Ey multifab */
amrex::GpuArray<int, 3> Ey_IndexType;
/** Gpu Vector with index type of the Ez multifab */
amrex::GpuArray<int, 3> Ez_IndexType;
/** Gpu Vector with index type of coarsening ratio with default value (1,1,1) */
amrex::GpuArray<int, 3> macro_cr_ratio;
private:
/** Conductivity, sigma, of the medium */
amrex::Real m_sigma = 0.0;
/** Permittivity, epsilon, of the medium */
amrex::Real m_epsilon = PhysConst::ep0;
/** Permeability, mu, of the medium */
amrex::Real m_mu = PhysConst::mu0;
/** Multifab for m_sigma */
std::unique_ptr<amrex::MultiFab> m_sigma_mf;
/** Multifab for m_epsilon */
std::unique_ptr<amrex::MultiFab> m_eps_mf;
/** Multifab for m_mu */
std::unique_ptr<amrex::MultiFab> m_mu_mf;
/** Stores initialization type for conductivity : constant or parser */
std::string m_sigma_s = "constant";
/** Stores initialization type for permittivity : constant or parser */
std::string m_epsilon_s = "constant";
/** Stores initialization type for permeability : constant or parser */
std::string m_mu_s = "constant";
/** string for storing parser function */
std::string m_str_sigma_function;
std::string m_str_epsilon_function;
std::string m_str_mu_function;
/** Parser Wrappers */
std::unique_ptr<amrex::Parser> m_sigma_parser;
std::unique_ptr<amrex::Parser> m_epsilon_parser;
std::unique_ptr<amrex::Parser> m_mu_parser;
};
/**
* \brief
* This struct contains only static functions to compute the co-efficients for the
* Lax-Wendroff scheme of macroscopic Maxwells equations using
* macroscopic properties, namely, conductivity (sigma), permittivity (epsilon).
* Permeability of the material, mu, is used as (beta/mu) for the E-update
* defined in MacroscopicEvolveECartesian().
*/
struct LaxWendroffAlgo {
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
static amrex::Real alpha (amrex::Real const sigma,
amrex::Real const epsilon,
amrex::Real dt) {
using namespace amrex;
amrex::Real fac1 = 0.5_rt * sigma * dt / epsilon;
amrex::Real alpha = (1._rt - fac1)/(1._rt + fac1);
return alpha;
}
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
static amrex::Real beta (amrex::Real const sigma,
amrex::Real const epsilon,
amrex::Real dt) {
using namespace amrex;
amrex::Real fac1 = 0.5_rt * sigma * dt / epsilon;
amrex::Real beta = dt / ( epsilon * (1._rt + fac1) );
return beta;
}
};
/**
* \brief
* This struct contains only static functions to compute the co-efficients for the
* BackwardEuler scheme of macroscopic Maxwells equations using
* macroscopic properties, namely, conductivity (sigma) and permittivity (epsilon).
* Permeability of the material, mu, is used as (beta/mu) for the E-update
* defined in MacroscopicEvolveECartesian().
*/
struct BackwardEulerAlgo {
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
static amrex::Real alpha (amrex::Real const sigma,
amrex::Real const epsilon,
amrex::Real dt) {
using namespace amrex;
amrex::Real fac1 = sigma * dt / epsilon;
amrex::Real alpha = (1._rt)/(1._rt + fac1);
return alpha;
}
AMREX_GPU_HOST_DEVICE AMREX_FORCE_INLINE
static amrex::Real beta (amrex::Real const sigma,
amrex::Real const epsilon,
amrex::Real dt) {
using namespace amrex;
amrex::Real fac1 = sigma * dt / epsilon;
amrex::Real beta = dt / ( epsilon * (1._rt + fac1) );
return beta;
}
};
#endif // WARPX_MACROSCOPIC_PROPERTIES_H_
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