adjoint_case.f90

! Copyright (c) 2024, The Neko Authors
! All rights reserved.
!
! Redistribution and use in source and binary forms, with or without
! modification, are permitted provided that the following conditions
! are met:
!
!   * Redistributions of source code must retain the above copyright
!     notice, this list of conditions and the following disclaimer.
!
!   * Redistributions in binary form must reproduce the above
!     copyright notice, this list of conditions and the following
!     disclaimer in the documentation and/or other materials provided
!     with the distribution.
!
!   * Neither the name of the authors nor the names of its
!     contributors may be used to endorse or promote products derived
!     from this software without specific prior written permission.
!
! THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
! "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
! LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
! FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
! COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
! INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
! BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
! LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
! CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
! ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! POSSIBILITY OF SUCH DAMAGE.
 
! Implements the `adjoint_case_t` type.
module adjoint_case
  use num_types, only: rp, dp, sp
  use case, only: case_t
  use adjoint_fluid_scheme, only: adjoint_fluid_scheme_t
  use adjoint_fluid_fctry, only: adjoint_fluid_scheme_factory
  use adjoint_fluid_pnpn, only: adjoint_fluid_pnpn_t
  use adjoint_output, only: adjoint_output_t
  use scalar_ic, only: set_scalar_ic
  use checkpoint, only: chkp_t
  use chkp_output, only: chkp_output_t
  use flow_ic, only: set_flow_ic
  use output_controller, only: output_controller_t
  use file, only: file_t
  use json_module, only: json_file
  use json_utils, only: json_get, json_get_or_default, json_extract_item
  use adjoint_scalar_scheme, only: adjoint_scalar_scheme_t
  use adjoint_scalar_pnpn, only : adjoint_scalar_pnpn_t
  use logger, only : neko_log
  use time_state, only : time_state_t
  use utils, only: neko_error
  use adjoint_scalar_convection_source_term, only: &
       adjoint_scalar_convection_source_term_t
  use json_utils_ext, only: json_key_fallback
  use adjoint_scalars, only: adjoint_scalars_t
  implicit none
  private
  public :: adjoint_case_t, adjoint_init, adjoint_free
 
  type :: adjoint_case_t
     class(adjoint_fluid_scheme_t), allocatable :: fluid_adj
     type(adjoint_scalars_t), allocatable :: adjoint_scalars
     type(adjoint_scalar_convection_source_term_t), allocatable :: &
          adjoint_convection_term
     type(case_t), pointer :: case
     type(time_state_t) :: time
     type(chkp_t) :: chkp
     type(chkp_output_t) :: chkp_out
 
     ! Fields
     real(kind=rp) :: tol
     type(adjoint_output_t) :: f_out
     type(output_controller_t) :: output_controller
 
     logical :: have_scalar = .false.
 
  end type adjoint_case_t
 
  interface adjoint_init
     module procedure adjoint_init_from_json ! todo, init from file
  end interface adjoint_init
 
contains
 
  ! Constructor from json.
  subroutine adjoint_init_from_json(this, neko_case)
    class(adjoint_case_t), intent(inout) :: this
    type(case_t), target, intent(inout) :: neko_case
 
    this%case => neko_case
    call adjoint_case_init_common(this, neko_case)
 
  end subroutine adjoint_init_from_json
 
  subroutine adjoint_case_init_common(this, neko_case)
    class(adjoint_case_t), target, intent(inout) :: this
    type(case_t), intent(inout) :: neko_case
    integer :: lx = 0
    real(kind=rp) :: real_val = 0.0_rp
    character(len=:), allocatable :: string_val
    integer :: precision
    integer :: n_scalars_primal, n_scalars_adjoint, i
    logical :: scalar = .false.
    logical :: temperature_found = .false.
 
    ! extra things for json
    type(json_file) :: ic_json, numerics_params
    type(json_file) :: scalar_params_primal, scalar_params_adjoint, json_subdict
    character(len=:), allocatable :: json_key
 
    !
    ! Setup adjoint fluid
    !
    call json_get(neko_case%params, 'case.fluid.scheme', string_val)
    call adjoint_fluid_scheme_factory(this%fluid_adj, trim(string_val))
 
    call json_get(neko_case%params, 'case.numerics.polynomial_order', lx)
    lx = lx + 1 ! add 1 to get number of gll points
 
    this%chkp%tlag => this%time%tlag
    this%chkp%dtlag => this%time%dtlag
 
    select type (f => this%fluid_adj)
    type is (adjoint_fluid_pnpn_t)
       call f%init(neko_case%msh, lx, neko_case%params, &
            neko_case%user, this%chkp)
    end select
    !
    ! Setup adjoint scalar
    !
    ! @todo no adjoint_scalars factory for now, probably not needed
 
    ! check how many adjoint scalars
    scalar = .false.
    n_scalars_adjoint = 0
    if (neko_case%params%valid_path('case.adjoint_scalar')) then
       call json_get_or_default(neko_case%params, &
            'case.adjoint_scalar.enabled', scalar, .true.)
       n_scalars_adjoint = 1
       n_scalars_primal = 1
    else if (neko_case%params%valid_path('case.adjoint_scalars')) then
       call neko_case%params%info('case.adjoint_scalars', &
            n_children = n_scalars_adjoint)
       call neko_case%params%info('case.scalars', n_children = n_scalars_primal)
       if (n_scalars_adjoint > 0) then
          scalar = .true.
       end if
    end if
 
    this%have_scalar = scalar
 
 
 
 
 
 
    if (this%have_scalar) then
       allocate(this%adjoint_scalars)
       call json_get(neko_case%params, 'case.numerics', &
            numerics_params)
       if (neko_case%params%valid_path('case.adjoint_scalar')) then
          ! For backward compatibility
          call json_get(neko_case%params, 'case.adjoint_scalar', &
               scalar_params_adjoint)
          call json_get(neko_case%params, 'case.scalar', &
               scalar_params_primal)
          call this%adjoint_scalars%init(neko_case%msh, neko_case%fluid%c_Xh, &
               neko_case%fluid%gs_Xh, scalar_params_adjoint, &
               scalar_params_primal, numerics_params, neko_case%user, &
               neko_case%chkp, neko_case%fluid%ulag, neko_case%fluid%vlag, &
               neko_case%fluid%wlag, neko_case%fluid%ext_bdf, &
               neko_case%fluid%rho)
          ! allocate the coupling term
          allocate(this%adjoint_convection_term)
          ! initialize the coupling term
          call this%adjoint_convection_term%init_from_components( &
               this%fluid_adj%f_adj_x, this%fluid_adj%f_adj_y, &
               this%fluid_adj%f_adj_z, this%case%scalars%scalar_fields(1)%s, &
               this%adjoint_scalars%adjoint_scalar_fields(1)%s_adj, &
               this%fluid_adj%c_Xh)
 
          select type (f => this%fluid_adj)
          type is (adjoint_fluid_pnpn_t)
             ! append the coupling term to the adjoint velocity equation
             call f%source_term%add(this%adjoint_convection_term)
          end select
       else
          ! Multiple scalars
 
          call json_get(this%case%params, &
               'case.adjoint_scalars', scalar_params_adjoint)
          call json_get(this%case%params, &
               'case.scalars', scalar_params_primal)
          call this%adjoint_scalars%init(n_scalars_adjoint, n_scalars_primal, &
               neko_case%msh, neko_case%fluid%c_Xh, neko_case%fluid%gs_Xh, &
               scalar_params_adjoint, scalar_params_primal, numerics_params, &
               neko_case%user, neko_case%chkp, neko_case%fluid%ulag, &
               neko_case%fluid%vlag, neko_case%fluid%wlag, &
               neko_case%fluid%ext_bdf, neko_case%fluid%rho)
          call neko_error('The adjoint scaling coupling term have not yet' // &
               'been implemented for multiple scalars')
       end if
    end if
 
    !
    ! Time control
    !
    call json_get(this%case%params, 'case.time', json_subdict)
    call this%time%init(json_subdict)
 
    !
    ! Setup user defined conditions
    !
    ! if (neko_case%params%valid_path('case.fluid.inflow_condition')) then
    !    call json_get(neko_case%params, 'case.fluid.inflow_condition.type', &
    !         string_val)
    !    if (trim(string_val) .eq. 'user') then
    !       call neko_case%fluid%set_usr_inflow(neko_case%user%fluid_user_if)
    !    end if
    ! end if
 
    ! Setup user boundary conditions for the scalar.
    ! if (adjoint_scalars) then
    !    call neko_case%adjoint_scalars%set_user_bc(&
    !         neko_case%user%scalar_user_bc)
    ! end if
 
    !
    ! Setup initial conditions
    !
 
    call neko_log%section("Adjoint initial condition")
    json_key = json_key_fallback(neko_case%params, &
         'case.adjoint_fluid.initial_condition', 'case.fluid.initial_condition')
 
    call json_get(neko_case%params, json_key, ic_json)
    call json_get(ic_json, 'type', string_val)
 
    if (trim(string_val) .ne. 'user') then
       call set_flow_ic( &
            this%fluid_adj%u_adj, this%fluid_adj%v_adj, this%fluid_adj%w_adj, &
            this%fluid_adj%p_adj, this%fluid_adj%c_Xh, this%fluid_adj%gs_Xh, &
            string_val, ic_json)
    else
       call set_flow_ic( &
            this%fluid_adj%u_adj, this%fluid_adj%v_adj, this%fluid_adj%w_adj, &
            this%fluid_adj%p_adj, this%fluid_adj%c_Xh, this%fluid_adj%gs_Xh, &
            neko_case%user%initial_conditions, neko_case%fluid%name)
    end if
 
    call neko_log%end_section()
 
    if (this%have_scalar) then
 
       if (neko_case%params%valid_path('case.adjoint_scalar')) then
          ! we shouldn't fallback to the primal here.
          call json_get(neko_case%params, &
               'case.adjoint_scalar.initial_condition.type', string_val)
          call json_get(neko_case%params, &
               'case.adjoint_scalar.initial_condition', ic_json)
 
          !call neko_log%section("Adjoint scalar initial condition ")
 
          if (trim(string_val) .ne. 'user') then
             if (trim(neko_case%scalars%scalar_fields(1)%name) .eq. &
                  'temperature') then
                call set_scalar_ic(&
                     this%adjoint_scalars%adjoint_scalar_fields(1)%s_adj, &
                     this%adjoint_scalars%adjoint_scalar_fields(1)%c_Xh, &
                     this%adjoint_scalars%adjoint_scalar_fields(1)%gs_Xh, &
                     string_val, ic_json, 0)
             else
                call set_scalar_ic(&
                     this%adjoint_scalars%adjoint_scalar_fields(1)%s_adj, &
                     this%adjoint_scalars%adjoint_scalar_fields(1)%c_Xh, &
                     this%adjoint_scalars%adjoint_scalar_fields(1)%gs_Xh, &
                     string_val, ic_json, 1)
             end if
          else
             call neko_error("user ICs not implemented for adjoint scalar")
             ! call set_scalar_ic(this%adjoint_scalars%s_adj, &
             !      this%adjoint_scalars%c_Xh, this%adjoint_scalars%gs_Xh, &
             !      this%usr%scalar_user_ic, neko_case%params)
          end if
 
          ! call neko_log%end_section()
       else
 
          ! Handle multiple scalars
          do i = 1, n_scalars_adjoint
             call json_extract_item(neko_case%params, 'case.adjoint_scalars', &
                  i, scalar_params_adjoint)
             call json_get(scalar_params_adjoint, &
                  'initial_condition.type', string_val)
             call json_get(scalar_params_adjoint, &
                  'initial_condition', json_subdict)
 
             if (trim(string_val) .ne. 'user') then
                if (trim(neko_case%scalars%scalar_fields(i)%name) .eq. &
                     'temperature') then
                   call set_scalar_ic(&
                        this%adjoint_scalars%adjoint_scalar_fields(i)%s_adj, &
                        this%adjoint_scalars%adjoint_scalar_fields(i)%c_Xh, &
                        this%adjoint_scalars%adjoint_scalar_fields(i)%gs_Xh, &
                        string_val, json_subdict, 0)
                   temperature_found = .true.
                else
                   if (temperature_found) then
                      ! if temperature is found, scalars start from index 1
                      call set_scalar_ic(&
                           this%adjoint_scalars%adjoint_scalar_fields(i)%s_adj, &
                           this%adjoint_scalars%adjoint_scalar_fields(i)%c_Xh, &
                           this%adjoint_scalars%adjoint_scalar_fields(i)%gs_Xh, &
                           string_val, json_subdict, i - 1)
                   else
                      ! if temperature is not found, scalars start from index 0
                      call set_scalar_ic(&
                           this%adjoint_scalars%adjoint_scalar_fields(i)%s_adj, &
                           this%adjoint_scalars%adjoint_scalar_fields(i)%c_Xh, &
                           this%adjoint_scalars%adjoint_scalar_fields(i)%gs_Xh, &
                           string_val, json_subdict, i)
                   end if
                end if
             else
                call neko_error("user ICs not implemented for adjoint scalar")
             end if
          end do
       end if
    end if
 
    ! Add initial conditions to BDF fluid_adj (if present)
    select type (f => this%fluid_adj)
    type is (adjoint_fluid_pnpn_t)
       call f%ulag%set(f%u_adj)
       call f%vlag%set(f%v_adj)
       call f%wlag%set(f%w_adj)
    end select
 
    !
    ! Validate that the neko_case is properly setup for time-stepping
    !
    call this%fluid_adj%validate
 
    if (this%have_scalar) then
       call this%adjoint_scalars%validate()
    end if
 
    !
    ! Setup output precision of the field files
    !
    call json_get_or_default(neko_case%params, 'case.output_precision', &
         string_val, 'single')
 
    if (trim(string_val) .eq. 'double') then
       precision = dp
    else
       precision = sp
    end if
 
    !
    ! Setup output_controller
    !
    call this%output_controller%init(this%time%end_time)
    if (this%have_scalar) then
       this%f_out = adjoint_output_t(precision, this%fluid_adj, &
            this%adjoint_scalars, path = trim(neko_case%output_directory))
    else
       this%f_out = adjoint_output_t(precision, this%fluid_adj, &
            path = trim(neko_case%output_directory))
    end if
 
    call json_get_or_default(neko_case%params, 'case.fluid.output_control',&
         string_val, 'org')
 
    if (trim(string_val) .eq. 'org') then
       ! yes, it should be real_val below for type compatibility
       call json_get(neko_case%params, 'case.nsamples', real_val)
       call this%output_controller%add(this%f_out, real_val, 'nsamples')
    else if (trim(string_val) .eq. 'never') then
       ! Fix a dummy 0.0 output_value
       call json_get_or_default(neko_case%params, 'case.fluid.output_value', &
            real_val, 0.0_rp)
       call this%output_controller%add(this%f_out, 0.0_rp, string_val)
    else
       call json_get(neko_case%params, 'case.fluid.output_value', real_val)
       call this%output_controller%add(this%f_out, real_val, string_val)
    end if
 
    ! !
    ! ! Save checkpoints (if nothing specified, default to saving at end of sim)
    ! !
    ! call json_get_or_default(neko_case%params, 'case.output_checkpoints',&
    !      logical_val, .true.)
    ! if (logical_val) then
    !    call json_get_or_default(neko_case%params, 'case.checkpoint_format', &
    !         string_val, "chkp")
    !   neko_case%f_chkp = chkp_output_t(this%fluid_adj%chkp, &
    ! path = output_directory, &
    !         ! fmt = trim(string_val))
    !    call json_get_or_default(neko_case%params, 'case.checkpoint_control', &
    !         string_val, "simulationtime")
    !    call json_get_or_default(neko_case%params, 'case.checkpoint_value', &
    ! real_val,&
    !         1e10_rp)
    !   call this%output_controller%add(this%f_chkp, real_val, string_val)
    ! end if
 
    !
    ! Initialize time and step
    !
    this%time%t = 0d0
    this%time%tstep = 0
 
  end subroutine adjoint_case_init_common
 
  ! Destructor.
  subroutine adjoint_free(this)
    class(adjoint_case_t), intent(inout) :: this
 
    nullify(this%case)
    if (allocated(this%adjoint_scalars)) then
       call this%adjoint_scalars%free()
       deallocate(this%adjoint_scalars)
    end if
 
    if (allocated(this%fluid_adj)) then
       call this%fluid_adj%free()
       deallocate(this%fluid_adj)
    end if
    call this%output_controller%free()
 
  end subroutine adjoint_free
 
end module adjoint_case