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/* Copyright 2020 Remi Lehe
*
* This file is part of WarpX.
*
* License: BSD-3-Clause-LBNL
*/
#ifndef WARPX_FINITE_DIFFERENCE_SOLVER_H_
#define WARPX_FINITE_DIFFERENCE_SOLVER_H_
#include <AMReX_MultiFab.H>
#include "MacroscopicProperties/MacroscopicProperties.H"
#include "BoundaryConditions/PML.H"
/**
* \brief Top-level class for the electromagnetic finite-difference solver
*
* Stores the coefficients of the finite-difference stencils,
* and has member functions to update fields over one time step.
*/
class FiniteDifferenceSolver
{
public:
// Constructor
/** \brief Initialize the finite-difference Maxwell solver (for a given refinement level)
*
* This function initializes the stencil coefficients for the chosen finite-difference algorithm
*
* \param fdtd_algo Identifies the chosen algorithm, as defined in WarpXAlgorithmSelection.H
* \param cell_size Cell size along each dimension, for the chosen refinement level
* \param do_nodal Whether the solver is applied to a nodal or staggered grid
*/
FiniteDifferenceSolver (
int const fdtd_algo,
std::array<amrex::Real,3> cell_size,
bool const do_nodal );
void EvolveB ( std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
int lev, amrex::Real const dt );
void EvolveE ( std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Efield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Jfield,
std::unique_ptr<amrex::MultiFab> const& Ffield,
int lev, amrex::Real const dt );
void EvolveF ( std::unique_ptr<amrex::MultiFab>& Ffield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
std::unique_ptr<amrex::MultiFab> const& rhofield,
int const rhocomp,
amrex::Real const dt );
void ComputeDivE ( const std::array<std::unique_ptr<amrex::MultiFab>,3>& Efield,
amrex::MultiFab& divE );
/**
* \brief Macroscopic E-update for non-vacuum medium using the user-selected
* finite-difference algorithm and macroscopic sigma-method defined in
* WarpXAlgorithmSelection.H
*
* \param[out] Efield vector of electric field MultiFabs updated at a given level
* \param[in] Bfield vector of magnetic field MultiFabs at a given level
* \param[in] Jfield vector of current density MultiFabs at a given level
* \param[in] dt timestep of the simulation
* \param[in] macroscopic_properties contains user-defined properties of the medium.
*/
void MacroscopicEvolveE ( std::array< std::unique_ptr<amrex::MultiFab>, 3>& Efield,
std::array< std::unique_ptr<amrex::MultiFab>, 3> const& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Jfield,
amrex::Real const dt,
std::unique_ptr<MacroscopicProperties> const& macroscopic_properties);
void EvolveBPML ( std::array< amrex::MultiFab*, 3 > Bfield,
std::array< amrex::MultiFab*, 3 > const Efield,
amrex::Real const dt,
const bool dive_cleaning);
void EvolveEPML ( std::array< amrex::MultiFab*, 3 > Efield,
std::array< amrex::MultiFab*, 3 > const Bfield,
std::array< amrex::MultiFab*, 3 > const Jfield,
amrex::MultiFab* const Ffield,
MultiSigmaBox const& sigba,
amrex::Real const dt, bool pml_has_particles );
void EvolveFPML ( amrex::MultiFab* Ffield,
std::array< amrex::MultiFab*, 3 > const Efield,
amrex::Real const dt );
private:
int m_fdtd_algo;
bool m_do_nodal;
#ifdef WARPX_DIM_RZ
amrex::Real m_dr, m_rmin;
int m_nmodes;
amrex::Gpu::DeviceVector<amrex::Real> m_stencil_coefs_r;
amrex::Gpu::DeviceVector<amrex::Real> m_stencil_coefs_z;
#else
amrex::Gpu::DeviceVector<amrex::Real> m_stencil_coefs_x;
amrex::Gpu::DeviceVector<amrex::Real> m_stencil_coefs_y;
amrex::Gpu::DeviceVector<amrex::Real> m_stencil_coefs_z;
#endif
public:
// The member functions below contain extended __device__ lambda.
// In order to compile with nvcc, they need to be public.
#ifdef WARPX_DIM_RZ
template< typename T_Algo >
void EvolveBCylindrical (
std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
const int lev,
amrex::Real const dt );
template< typename T_Algo >
void EvolveECylindrical (
std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Efield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Jfield,
std::unique_ptr<amrex::MultiFab> const& Ffield,
const int lev,
amrex::Real const dt );
template< typename T_Algo >
void EvolveFCylindrical (
std::unique_ptr<amrex::MultiFab>& Ffield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
std::unique_ptr<amrex::MultiFab> const& rhofield,
int const rhocomp,
amrex::Real const dt );
template< typename T_Algo >
void ComputeDivECylindrical (
const std::array<std::unique_ptr<amrex::MultiFab>,3>& Efield,
amrex::MultiFab& divE );
#else
template< typename T_Algo >
void EvolveBCartesian (
std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
int lev, amrex::Real const dt );
template< typename T_Algo >
void EvolveECartesian (
std::array< std::unique_ptr<amrex::MultiFab>, 3 >& Efield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Bfield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Jfield,
std::unique_ptr<amrex::MultiFab> const& Ffield,
int lev, amrex::Real const dt );
template< typename T_Algo >
void EvolveFCartesian (
std::unique_ptr<amrex::MultiFab>& Ffield,
std::array< std::unique_ptr<amrex::MultiFab>, 3 > const& Efield,
std::unique_ptr<amrex::MultiFab> const& rhofield,
int const rhocomp,
amrex::Real const dt );
template< typename T_Algo >
void ComputeDivECartesian (
const std::array<std::unique_ptr<amrex::MultiFab>,3>& Efield,
amrex::MultiFab& divE );
template< typename T_Algo, typename T_MacroAlgo >
void MacroscopicEvolveECartesian (
std::array< std::unique_ptr< amrex::MultiFab>, 3>& Efield,
std::array< std::unique_ptr< amrex::MultiFab>, 3> const &Bfield,
std::array< std::unique_ptr< amrex::MultiFab>, 3> const& Jfield,
amrex::Real const dt,
std::unique_ptr<MacroscopicProperties> const& macroscopic_properties);
template< typename T_Algo >
void EvolveBPMLCartesian (
std::array< amrex::MultiFab*, 3 > Bfield,
std::array< amrex::MultiFab*, 3 > const Efield,
amrex::Real const dt,
const bool dive_cleaning);
template< typename T_Algo >
void EvolveEPMLCartesian (
std::array< amrex::MultiFab*, 3 > Efield,
std::array< amrex::MultiFab*, 3 > const Bfield,
std::array< amrex::MultiFab*, 3 > const Jfield,
amrex::MultiFab* const Ffield,
MultiSigmaBox const& sigba,
amrex::Real const dt, bool pml_has_particles );
template< typename T_Algo >
void EvolveFPMLCartesian ( amrex::MultiFab* Ffield,
std::array< amrex::MultiFab*, 3 > const Efield,
amrex::Real const dt );
#endif
};
#endif // WARPX_FINITE_DIFFERENCE_SOLVER_H_
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