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dist_fn.f90
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module dist_fn
implicit none
public :: init_gxyz
public :: init_dist_fn, finish_dist_fn
public :: adiabatic_option_switch
public :: adiabatic_option_fieldlineavg
private
logical :: dist_fn_initialized = .false.
logical :: gxyz_initialized = .false.
logical :: kp2init = .false.
logical :: vp2init = .false.
! logical :: bessinit = .false.
logical :: readinit = .false.
integer :: adiabatic_option_switch
integer, parameter :: adiabatic_option_default = 1, &
adiabatic_option_zero = 2, &
adiabatic_option_fieldlineavg = 3, &
adiabatic_option_yavg = 4
logical :: debug = .false.
contains
subroutine init_gxyz (restarted)
use dist_fn_arrays, only: gvmu, gold, gnew
use redistribute, only: gather, scatter
use dist_redistribute, only: kxkyz2vmu
use physics_flags, only: radial_variation
use stella_layouts, only: vmu_lo, iv_idx, imu_idx, is_idx
use stella_transforms, only: transform_kx2x_xfirst, transform_x2kx_xfirst
use kt_grids, only: nalpha, nakx, naky, multiply_by_rho
use vpamu_grids, only: mu, vpa, vperp2
use zgrid, only: nzgrid, ntubes
use species, only: spec, pfac
use stella_geometry, only: dBdrho, gfac
implicit none
real :: corr
integer :: ivmu, is, imu, iv, it, iz, ia
real, dimension (:,:), allocatable :: energy
complex, dimension (:,:), allocatable :: g0k
logical, intent(in) :: restarted
if (gxyz_initialized) return
gxyz_initialized = .false.
! get version of g that has ky,kx,z local
call gather (kxkyz2vmu, gvmu, gnew)
ia = 1
!calculate radial corrections to F0 for use in Krook operator, as well as g1 from initialization
if(radial_variation) then
!init_g uses maxwellians, so account for variation in temperature, density, and B
allocate (energy(nalpha,-nzgrid:nzgrid))
allocate (g0k(naky,nakx))
do ivmu = vmu_lo%llim_proc, vmu_lo%ulim_proc
is = is_idx(vmu_lo, ivmu)
imu = imu_idx(vmu_lo, ivmu)
iv = iv_idx(vmu_lo, ivmu)
energy = (vpa(iv)**2 + vperp2(:,:,imu))*(spec(is)%temp_psi0/spec(is)%temp)
do it = 1, ntubes
do iz = -nzgrid, nzgrid
corr = -( pfac*(spec(is)%fprim+spec(is)%tprim*(energy(ia,iz)-1.5)) &
+ 2*gfac*mu(imu)*dBdrho(iz))
if(.not.restarted) then
g0k = corr*gnew(:,:,iz,it,ivmu)
call multiply_by_rho(g0k)
gnew(:,:,iz,it,ivmu) = gnew(:,:,iz,it,ivmu) + g0k
endif
enddo
enddo
enddo
deallocate(energy, g0k)
if(.not.restarted) call scatter(kxkyz2vmu,gnew,gvmu)
endif
gold = gnew
end subroutine init_gxyz
subroutine init_dist_fn
use mp, only: proc0
use stella_layouts, only: init_dist_fn_layouts
use gyro_averages, only: init_bessel
implicit none
if (dist_fn_initialized) return
dist_fn_initialized = .true.
debug = debug .and. proc0
if (debug) write (*,*) 'dist_fn::init_dist_fn::read_parameters'
call read_parameters
if (debug) write (*,*) 'dist_fn::init_dist_fn::allocate_arrays'
call allocate_arrays
if (debug) write (*,*) 'dist_fn::init_dist_fn::init_kperp2'
call init_kperp2
if (debug) write (*,*) 'dist_fn::init_dist_fn::init_vperp2'
call init_vperp2
if (debug) write (*,*) 'dist_fn::init_dist_fn::init_bessel'
call init_bessel
end subroutine init_dist_fn
subroutine read_parameters
use file_utils, only: error_unit, input_unit_exist
use text_options, only: text_option, get_option_value
use mp, only: proc0, broadcast
implicit none
logical :: dfexist
type (text_option), dimension (7), parameter :: adiabaticopts = &
(/ text_option('default', adiabatic_option_default), &
text_option('no-field-line-average-term', adiabatic_option_default), &
text_option('field-line-average-term', adiabatic_option_fieldlineavg), &
text_option('iphi00=0', adiabatic_option_default), &
text_option('iphi00=1', adiabatic_option_default), &
text_option('iphi00=2', adiabatic_option_fieldlineavg), &
text_option('iphi00=3', adiabatic_option_yavg)/)
character(30) :: adiabatic_option
namelist /dist_fn_knobs/ adiabatic_option
integer :: ierr, in_file
if (readinit) return
readinit = .true.
if (proc0) then
adiabatic_option = 'default'
in_file = input_unit_exist("dist_fn_knobs", dfexist)
if (dfexist) read (unit=in_file, nml=dist_fn_knobs)
ierr = error_unit()
call get_option_value &
(adiabatic_option, adiabaticopts, adiabatic_option_switch, &
ierr, "adiabatic_option in dist_fn_knobs")
end if
call broadcast (adiabatic_option_switch)
end subroutine read_parameters
subroutine init_kperp2
use dist_fn_arrays, only: kperp2, dkperp2dr
use stella_geometry, only: gds2, gds21, gds22
use stella_geometry, only: dgds2dr, dgds21dr
use stella_geometry, only: dgds22dr
use stella_geometry, only: geo_surf, q_as_x
use zgrid, only: nzgrid
use kt_grids, only: naky, nakx, theta0
use kt_grids, only: akx, aky
use kt_grids, only: zonal_mode
use kt_grids, only: nalpha
implicit none
integer :: iky, ikx
if (kp2init) return
kp2init = .true.
allocate (kperp2(naky,nakx,nalpha,-nzgrid:nzgrid))
allocate (dkperp2dr(naky,nakx,nalpha,-nzgrid:nzgrid))
do iky = 1, naky
if (zonal_mode(iky)) then
do ikx = 1, nakx
if(q_as_x) then
kperp2(iky,ikx,:,:) = akx(ikx)*akx(ikx)*gds22
where (kperp2(iky,ikx,:,:) .gt. epsilon(0.0))
dkperp2dr(iky,ikx,:,:) = akx(ikx)*akx(ikx)*dgds22dr/kperp2(iky,ikx,:,:)
elsewhere
dkperp2dr(iky,ikx,:,:) = 0.0
endwhere
else
kperp2(iky,ikx,:,:) = akx(ikx)*akx(ikx)*gds22/(geo_surf%shat**2)
where (kperp2(iky,ikx,:,:) .gt. epsilon(0.0))
dkperp2dr(iky,ikx,:,:) = akx(ikx)*akx(ikx)*dgds22dr/(geo_surf%shat**2*kperp2(iky,ikx,:,:))
elsewhere
dkperp2dr(iky,ikx,:,:) = 0.0
endwhere
endif
end do
else
do ikx = 1, nakx
kperp2(iky,ikx,:,:) = aky(iky)*aky(iky) &
*(gds2 + 2.0*theta0(iky,ikx)*gds21 &
+ theta0(iky,ikx)*theta0(iky,ikx)*gds22)
dkperp2dr(iky,ikx,:,:) = aky(iky)*aky(iky) &
*(dgds2dr + 2.0*theta0(iky,ikx)*dgds21dr &
+ theta0(iky,ikx)*theta0(iky,ikx)*dgds22dr)
dkperp2dr(iky,ikx,:,:)=dkperp2dr(iky,ikx,:,:)/kperp2(iky,ikx,:,:)
if(any(kperp2(iky,ikx,:,:) .lt. epsilon(0.))) dkperp2dr(iky,ikx,:,:) = 0.
end do
end if
end do
call enforce_single_valued_kperp2
! filename=trim(run_name)//".kperp2"
! open (1232,file=trim(filename),status='unknown')
! ia=1
! do iz=-nzgrid,nzgrid
! do ikx=1, naky
! do iky = 1, 1
! write(1232,'(2e15.8)') kperp2(iky,ikx,ia,iz), dkperp2dr(iky,ikx,ia,iz)
! enddo
! enddo
! enddo
! close (1232)
end subroutine init_kperp2
subroutine enforce_single_valued_kperp2
use dist_fn_arrays, only: kperp2
use kt_grids, only: naky, nalpha
use zgrid, only: nzgrid
use extended_zgrid, only: neigen, nsegments, ikxmod
implicit none
integer :: iky, ie, iseg
real, dimension (:), allocatable :: tmp
allocate (tmp(nalpha)) ; tmp = 0.0
do iky = 1, naky
do ie = 1, neigen(iky)
if (nsegments(ie,iky) > 1) then
do iseg = 2, nsegments(ie,iky)
tmp = 0.5*(kperp2(iky,ikxmod(iseg-1,ie,iky),:,nzgrid) + kperp2(iky,ikxmod(iseg,ie,iky),:,-nzgrid))
kperp2(iky,ikxmod(iseg,ie,iky),:,-nzgrid) = tmp
kperp2(iky,ikxmod(iseg-1,ie,iky),:,nzgrid) = tmp
end do
end if
end do
end do
deallocate (tmp)
end subroutine enforce_single_valued_kperp2
subroutine allocate_arrays
use stella_layouts, only: kxkyz_lo, vmu_lo
use zgrid, only: nzgrid, ntubes
use kt_grids, only: naky, nakx
use vpamu_grids, only: nvpa, nmu
use dist_fn_arrays, only: gnew, gold
use dist_fn_arrays, only: gvmu
implicit none
if (.not.allocated(gnew)) &
allocate (gnew(naky,nakx,-nzgrid:nzgrid,ntubes,vmu_lo%llim_proc:vmu_lo%ulim_alloc))
gnew = 0.
if (.not.allocated(gold)) &
allocate (gold(naky,nakx,-nzgrid:nzgrid,ntubes,vmu_lo%llim_proc:vmu_lo%ulim_alloc))
gold = 0.
if (.not.allocated(gvmu)) &
allocate (gvmu(nvpa,nmu,kxkyz_lo%llim_proc:kxkyz_lo%ulim_alloc))
gvmu = 0.
end subroutine allocate_arrays
subroutine init_vperp2
use stella_geometry, only: bmag
use zgrid, only: nzgrid
use vpamu_grids, only: vperp2
use vpamu_grids, only: nmu, mu
use kt_grids, only: nalpha
implicit none
integer :: imu
if (vp2init) return
vp2init = .true.
if (.not.allocated(vperp2)) allocate (vperp2(nalpha,-nzgrid:nzgrid,nmu)) ; vperp2 = 0.
do imu = 1, nmu
vperp2(:,:,imu) = 2.0*mu(imu)*bmag
end do
end subroutine init_vperp2
subroutine finish_dist_fn
use gyro_averages, only: finish_bessel
implicit none
call finish_bessel
call finish_kperp2
call finish_vperp2
call deallocate_arrays
dist_fn_initialized = .false.
readinit = .false.
gxyz_initialized = .false.
end subroutine finish_dist_fn
subroutine deallocate_arrays
use dist_fn_arrays, only: gnew, gold, gvmu
implicit none
if (allocated(gnew)) deallocate (gnew)
if (allocated(gold)) deallocate (gold)
if (allocated(gvmu)) deallocate (gvmu)
end subroutine deallocate_arrays
subroutine finish_kperp2
use dist_fn_arrays, only: kperp2, dkperp2dr
implicit none
if (allocated(kperp2)) deallocate (kperp2)
if (allocated(dkperp2dr)) deallocate (dkperp2dr)
kp2init = .false.
end subroutine finish_kperp2
subroutine finish_vperp2
use vpamu_grids, only: vperp2
implicit none
if (allocated(vperp2)) deallocate (vperp2)
vp2init = .false.
end subroutine finish_vperp2
end module dist_fn