derivative.f90

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module derivative
  use num_types, only : rp, dp, sp
  use json_module, only : json_file
  use simulation_component, only : simulation_component_t
  use field_registry, only : neko_field_registry
  use field, only : field_t
  use operators, only : dudxyz
  use case, only : case_t
  use fld_file_output, only : fld_file_output_t
  use json_utils, only : json_get, json_get_or_default
  use field_writer, only : field_writer_t
  use utils, only : neko_error
  implicit none
  private
 
  type, public, extends(simulation_component_t) :: derivative_t
     type(field_t), pointer :: u
     type(field_t), pointer :: du
     real(kind=rp), pointer :: dr(:,:,:,:)
     real(kind=rp), pointer :: ds(:,:,:,:)
     real(kind=rp), pointer :: dt(:,:,:,:)
     type(field_writer_t) :: writer
 
   contains
     procedure, pass(this) :: init => derivative_init_from_json
     procedure, pass(this) :: init_from_attributes => &
        derivative_init_from_attributes
     procedure, pass(this) :: free => derivative_free
     procedure, pass(this) :: compute_ => derivative_compute
  end type derivative_t
 
contains
 
  subroutine derivative_init_from_json(this, json, case)
    class(derivative_t), intent(inout) :: this
    type(json_file), intent(inout) :: json
    class(case_t), intent(inout), target :: case
    character(len=:), allocatable :: fieldname
    character(len=:), allocatable :: direction
    character(len=20) :: fields(1)
 
    ! Add fields keyword to the json so that the field_writer picks it up.
    ! Will also add fields to the registry.
    call json_get(json, "field", fieldname)
    call json_get(json, "direction", direction)
 
    fields(1) = "d" // trim(fieldname) // "_d" // direction
    call json%add("fields", fields)
 
    call this%init_base(json, case)
    call this%writer%init(json, case)
 
    call derivative_init_from_attributes(this, fieldname, direction)
  end subroutine derivative_init_from_json
 
  subroutine derivative_init_from_attributes(this, fieldname, direction)
    class(derivative_t), intent(inout) :: this
    character(len=*) :: fieldname
    character(len=*) :: direction
 
    this%u => neko_field_registry%get_field_by_name(trim(fieldname))
 
    this%du => neko_field_registry%get_field_by_name(&
                        "d" // fieldname // "_d" // direction)
 
    if (direction .eq. "x") then
       this%dr => this%case%fluid%c_Xh%drdx
       this%ds => this%case%fluid%c_Xh%dsdx
       this%dt => this%case%fluid%c_Xh%dtdx
    else if (direction .eq. "y") then
       this%dr => this%case%fluid%c_Xh%drdy
       this%ds => this%case%fluid%c_Xh%dsdy
       this%dt => this%case%fluid%c_Xh%dtdy
    else if (direction .eq. "z") then
       this%dr => this%case%fluid%c_Xh%drdz
       this%ds => this%case%fluid%c_Xh%dsdz
       this%dt => this%case%fluid%c_Xh%dtdz
    else
        call neko_error("The direction of the derivative must be x, y or z")
    end if
  end subroutine derivative_init_from_attributes
 
  subroutine derivative_free(this)
    class(derivative_t), intent(inout) :: this
    call this%free_base()
    call this%writer%free()
    nullify(this%du)
    nullify(this%u)
    nullify(this%dr)
    nullify(this%ds)
    nullify(this%dt)
  end subroutine derivative_free
 
  subroutine derivative_compute(this, t, tstep)
    class(derivative_t), intent(inout) :: this
    real(kind=rp), intent(in) :: t
    integer, intent(in) :: tstep
 
    call dudxyz(this%du%x, this%u%x, this%dr, this%dr, this%dr,&
                this%case%fluid%c_Xh)
  end subroutine derivative_compute
 
end module derivative