propagator_verlet.F90

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!! Copyright (C)  2019 N. Tancogne-Dejean
!!
!! 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, 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.
!!
 
#include "global.h"
 
module propagator_verlet_oct_m
  use algorithm_oct_m
  use debug_oct_m
  use global_oct_m
  use propagator_oct_m
 
  implicit none
 
  private
  public ::                            &
    propagator_verlet_t
 
  type, extends(propagator_t) :: propagator_verlet_t
    private
  end type propagator_verlet_t
 
  interface propagator_verlet_t
    procedure propagator_verlet_constructor
  end interface propagator_verlet_t
 
  !# doc_start verlet_propagation_operations
  ! Specific verlet propagation operations identifiers
  character(len=30), public, parameter ::      &
    VERLET_START       = 'VERLET_START',       &
    verlet_finish      = 'VERLET_FINISH',      &
    verlet_update_pos  = 'VERLET_UPDATE_POS',  &
    verlet_compute_acc = 'VERLET_COMPUTE_ACC', &
    verlet_compute_vel = 'VERLET_COMPUTE_VEL'
 
  ! Specific verlet propagation operations
  type(algorithmic_operation_t), public, parameter :: &
    OP_VERLET_START       = algorithmic_operation_t(verlet_start,       'Starting Verlet propagation'),               &
    op_verlet_finish      = algorithmic_operation_t(verlet_finish,      'Finishing Verlet propagation'),              &
    op_verlet_update_pos  = algorithmic_operation_t(verlet_update_pos,  'Propagation step - Updating positions'),     &
    op_verlet_compute_acc = algorithmic_operation_t(verlet_compute_acc, 'Propagation step - Computing acceleration'), &
    op_verlet_compute_vel = algorithmic_operation_t(verlet_compute_vel, 'Propagation step - Computing velocity')
  !# doc_end
 
contains
 
  ! ---------------------------------------------------------
  function propagator_verlet_constructor(dt) result(this)
    real(real64),              intent(in) :: dt
    type(propagator_verlet_t), pointer    :: this
 
    push_sub(propagator_verlet_constructor)
 
    allocate(this)
 
    this%start_operation = op_verlet_start
    this%final_operation = op_verlet_finish
 
    call this%add_operation(op_verlet_update_pos)
    call this%add_operation(op_update_couplings)
    call this%add_operation(op_update_interactions)
    call this%add_operation(op_verlet_compute_acc)
    call this%add_operation(op_verlet_compute_vel)
    call this%add_operation(op_iteration_done)
    call this%add_operation(op_rewind_algorithm)
 
    ! Verlet has only one algorithmic step
    this%algo_steps = 1
 
    this%dt = dt
 
    pop_sub(propagator_verlet_constructor)
  end function propagator_verlet_constructor
 
end module propagator_verlet_oct_m
 
 
!! Local Variables:
!! mode: f90
!! coding: utf-8
!! End: