PairWiseCoulombCollisionFunc.H

Go to the documentation of this file.

/* Copyright 2021 Neil Zaim
 *
 * This file is part of WarpX.
 *
 * License: BSD-3-Clause-LBNL
 */
 
#ifndef PAIRWISE_COULOMB_COLLISION_FUNC_H_
#define PAIRWISE_COULOMB_COLLISION_FUNC_H_
 
#include "ElasticCollisionPerez.H"
#include "Particles/Pusher/GetAndSetPosition.H"
#include "Particles/WarpXParticleContainer.H"
#include "Utils/Parser/ParserUtils.H"
 
#include <AMReX_DenseBins.H>
#include <AMReX_ParmParse.H>
#include <AMReX_Random.H>
#include <AMReX_REAL.H>
 
 
class PairWiseCoulombCollisionFunc{
    // Define shortcuts for frequently-used type names
    using ParticleType = WarpXParticleContainer::ParticleType;
    using ParticleBins = amrex::DenseBins<ParticleType>;
    using index_type = ParticleBins::index_type;
    using SoaData_type = WarpXParticleContainer::ParticleTileType::ParticleTileDataType;
 
public:
    PairWiseCoulombCollisionFunc () = default;
 
    PairWiseCoulombCollisionFunc (const std::string collision_name,
                                  [[maybe_unused]] MultiParticleContainer const * const mypc,
                                  const bool isSameSpecies):
        m_isSameSpecies{isSameSpecies}
    {
        using namespace amrex::literals;
        const amrex::ParmParse pp_collision_name(collision_name);
        // default Coulomb log, if < 0, will be computed automatically
        amrex::ParticleReal CoulombLog = -1.0_prt;
        utils::parser::queryWithParser(
            pp_collision_name, "CoulombLog", CoulombLog);
        m_CoulombLog = CoulombLog;
    }
 
    AMREX_GPU_HOST_DEVICE AMREX_INLINE
    void operator() (
        index_type const I1s, index_type const I1e,
        index_type const I2s, index_type const I2e,
        index_type const* AMREX_RESTRICT I1,
        index_type const* AMREX_RESTRICT I2,
        SoaData_type soa_1, SoaData_type soa_2,
        GetParticlePosition<PIdx> /*get_position_1*/, GetParticlePosition<PIdx> /*get_position_2*/,
        amrex::ParticleReal const  q1, amrex::ParticleReal const  q2,
        amrex::ParticleReal const  m1, amrex::ParticleReal const  m2,
        amrex::Real const  dt, amrex::Real const dV,
        index_type const /*cell_start_pair*/, index_type* /*p_mask*/,
        index_type* /*p_pair_indices_1*/, index_type* /*p_pair_indices_2*/,
        amrex::ParticleReal* /*p_pair_reaction_weight*/,
        amrex::RandomEngine const& engine) const
        {
            using namespace amrex::literals;
 
            ElasticCollisionPerez(
                    I1s, I1e, I2s, I2e, I1, I2,
                    soa_1, soa_2,
                    q1, q2, m1, m2, -1.0_prt, -1.0_prt,
                    dt, m_CoulombLog, dV, engine, m_isSameSpecies);
        }
 
private:
    amrex::ParticleReal m_CoulombLog;
    bool m_isSameSpecies;
};
 
#endif // PAIRWISE_COULOMB_COLLISION_FUNC_H_