mean_field.f90

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module mean_field
  use neko_config, only : neko_bcknd_device
  use stats_quant, only : stats_quant_t
  use num_types, only : rp
  use registry, only : neko_registry
  use field, only : field_t
  use utils, only : neko_varname_len
  use field_math, only : field_cmult, field_add2s2
  implicit none
  private
 
  type, public, extends(stats_quant_t) :: mean_field_t
     type(field_t), pointer :: f => null()
     type(field_t), pointer :: mf => null()
     real(kind=rp) :: time
   contains
     procedure, pass(this) :: init => mean_field_init
     procedure, pass(this) :: free => mean_field_free
     procedure, pass(this) :: update => mean_field_update
     procedure, pass(this) :: reset => mean_field_reset
  end type mean_field_t
 
contains
 
  subroutine mean_field_init(this, f, field_name)
    class(mean_field_t), intent(inout) :: this
    type(field_t), intent(in), target :: f
    character(len=*), optional, intent(in) :: field_name
    character(len=NEKO_VARNAME_LEN) :: name
 
    call this%free()
 
    this%f => f
    this%time = 0.0_rp
 
    if (present(field_name)) then
       name = field_name
    else
       write(name, '(A,A)') 'mean_', trim(f%name)
    end if
 
    call neko_registry%add_field(f%dof, trim(name))
    this%mf => neko_registry%get_field(trim(name))
 
  end subroutine mean_field_init
 
  subroutine mean_field_free(this)
    class(mean_field_t), intent(inout) :: this
 
    if (associated(this%f)) then
       nullify(this%f)
    end if
 
    if (associated(this%mf)) then
       nullify(this%mf)
    end if
 
  end subroutine mean_field_free
 
  subroutine mean_field_reset(this)
    class(mean_field_t), intent(inout) :: this
 
    this%time = 0.0
    this%mf = 0.0_rp
  end subroutine mean_field_reset
 
 
  subroutine mean_field_update(this, k)
    class(mean_field_t), intent(inout) :: this
    real(kind=rp), intent(in) :: k
 
    call field_cmult(this%mf, this%time, size(this%mf%x))
    call field_add2s2(this%mf, this%f, k, size(this%mf%x))
    this%time = this%time + k
    call field_cmult(this%mf, 1.0_rp / this%time, size(this%mf%x))
 
  end subroutine mean_field_update
 
end module mean_field