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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>
/**
* \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,
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,
amrex::Real const dt );
private:
int m_fdtd_algo;
bool m_do_nodal;
#ifdef WARPX_DIM_RZ
amrex::Real m_dr, m_rmin;
amrex::Real m_nmodes;
amrex::Gpu::ManagedVector<amrex::Real> m_stencil_coefs_r;
amrex::Gpu::ManagedVector<amrex::Real> m_stencil_coefs_z;
#else
amrex::Gpu::ManagedVector<amrex::Real> m_stencil_coefs_x;
amrex::Gpu::ManagedVector<amrex::Real> m_stencil_coefs_y;
amrex::Gpu::ManagedVector<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,
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,
amrex::Real const dt );
#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,
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,
amrex::Real const dt );
#endif
};
#endif // WARPX_FINITE_DIFFERENCE_SOLVER_H_
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