diff --git a/src/collision_mod.F90 b/src/collision_mod.F90
index 903e6ddbae0a9488e30bae562b6a6541f9389292..5d842e4db52b432dcd5ff4c8213f8f74cc2b1b05 100644
--- a/src/collision_mod.F90
+++ b/src/collision_mod.F90
@@ -13,7 +13,6 @@ LOGICAL, PUBLIC, PROTECTED :: cosolver_coll ! check if cosolver mat
PUBLIC :: init_collision
PUBLIC :: collision_readinputs, coll_outputinputs
PUBLIC :: compute_Capj
-PUBLIC :: compute_lenard_bernstein, compute_dougherty
CONTAINS
SUBROUTINE init_collision
@@ -36,6 +35,11 @@ CONTAINS
collision_model = 'LB'
cosolver_coll = .false.
INTERSPECIES = .false.
+ ! Ivanov model (Ivanov et al. 2022)
+ CASE ('IV','ivanov','Ivanov')
+ collision_model = 'IV'
+ cosolver_coll = .false.
+ INTERSPECIES = .false.
! Dougherty
CASE ('DG','dougherty','Dougherty')
collision_model = 'DG'
@@ -91,6 +95,8 @@ CONTAINS
SELECT CASE(collision_model)
CASE ('LB')
CALL compute_lenard_bernstein
+ CASE('IV')
+ CALL compute_ivanov
CASE ('DG')
CALL compute_dougherty
CASE ('SG','LR','LD')
@@ -110,7 +116,7 @@ CONTAINS
!******************************************************************************!
SUBROUTINE compute_lenard_bernstein
USE grid, ONLY: ias,iae, ips,ipe, ijs,ije, parray, jarray, &
- ikys,ikye, ikxs,ikxe, izs,ize, kparray
+ ikys,ikye, ikxs,ikxe, izs,ize, kparray, ngp, ngj, ngz
USE species, ONLY: sigma2_tau_o2, nu_ab
USE time_integration, ONLY: updatetlevel
USE array, ONLY: Capj
@@ -118,25 +124,25 @@ CONTAINS
IMPLICIT NONE
COMPLEX(xp) :: TColl_
REAL(xp) :: j_xp, p_xp, ba_2, kp
- INTEGER :: iz,ikx,iky,ij,ip,ia,eo
- DO iz = izs,ize
+ INTEGER :: iz,ikx,iky,ij,ip,ia,eo,ipi,iji,izi
+ DO iz = izs,ize; izi = iz + ngz/2
DO ikx = ikxs, ikxe;
DO iky = ikys, ikye;
- DO ij = ijs,ije
- DO ip = ips,ipe;
+ DO ij = ijs,ije; iji = ij + ngj/2
+ DO ip = ips,ipe; ipi = ip + ngp/2
DO ia = ias, iae
!** Auxiliary variables **
- eo = MODULO(parray(ip),2)
- p_xp = REAL(parray(ip),xp)
- j_xp = REAL(jarray(ij),xp)
- kp = kparray(iky,ikx,iz,eo)
+ eo = MODULO(parray(ipi),2)
+ p_xp = REAL(parray(ipi),xp)
+ j_xp = REAL(jarray(iji),xp)
+ kp = kparray(iky,ikx,izi,eo)
ba_2 = kp**2 * sigma2_tau_o2(ia) ! this is (ba/2)^2
!** Assembling collison operator **
! -nuee (p + 2j) Nepj
- TColl_ = -nu_ab(ia,ia) * (p_xp + 2._xp*j_xp)*moments(ia,ip,ij,iky,ikx,iz,updatetlevel)
+ TColl_ = -nu_ab(ia,ia) * (p_xp + 2._xp*j_xp)*moments(ia,ipi,iji,iky,ikx,izi,updatetlevel)
IF(GK_CO) THEN
- TColl_ = TColl_ - nu_ab(ia,ia) *2._xp*ba_2*moments(ia,ip,ij,iky,ikx,iz,updatetlevel)
+ TColl_ = TColl_ - nu_ab(ia,ia) *2._xp*ba_2*moments(ia,ipi,iji,iky,ikx,izi,updatetlevel)
ENDIF
Capj(ia,ip,ij,iky,ikx,iz) = TColl_
ENDDO
@@ -147,6 +153,63 @@ CONTAINS
ENDDO
END SUBROUTINE compute_lenard_bernstein
+ !******************************************************************************!
+ !! Doughtery drift-kinetic collision operator (species like)
+ !******************************************************************************!
+ SUBROUTINE compute_ivanov
+ USE grid, ONLY: local_na, local_np, local_nj, parray, jarray, ngp, ngj, &
+ ip0, ip2, ij0, ij1, ieven, &
+ local_nky, local_nkx, local_nz, ngz,&
+ kparray
+ USE species, ONLY: nu_ab, tau, q_tau
+ USE time_integration, ONLY: updatetlevel
+ USE array, ONLY: Capj
+ USE fields, ONLY: moments, phi
+ USE prec_const, ONLY: xp, SQRT2, twothird
+ IMPLICIT NONE
+ COMPLEX(xp) :: Tmp
+ INTEGER :: iz,ikx,iky,ij,ip,ia, ipi,iji,izi
+ REAL(xp) :: j_xp, p_xp, kp_xp
+ DO iz = 1,local_nz
+ izi = iz + ngz/2
+ DO ikx = 1,local_nkx
+ DO iky = 1,local_nky
+ kp_xp = kparray(iky,ikx,izi,ieven)
+ DO ij = 1,local_nj
+ iji = ij + ngj/2
+ DO ip = 1,local_np
+ ipi = ip + ngp/2
+ DO ia = 1,local_na
+ !** Auxiliary variables **
+ p_xp = REAL(parray(ipi),xp)
+ j_xp = REAL(jarray(iji),xp)
+ !** Assembling collison operator **
+ IF( (p_xp .EQ. 0._xp) .AND. (j_xp .EQ. 0._xp)) THEN !Ca00
+ Tmp = tau(ia)**2 * kp_xp**4*(&
+ 67_xp/120_xp *moments(ia,ip0,ij0,iky,ikx,izi,updatetlevel)&
+ +67_xp*SQRT2/240_xp*moments(ia,ip2,ij0,iky,ikx,izi,updatetlevel)&
+ -67_xp/240_xp *moments(ia,ip0,ij1,iky,ikx,izi,updatetlevel)&
+ -3_xp/10_xp *q_tau(ia)*phi(iky,ikx,izi))
+ ELSEIF( (p_xp .EQ. 2._xp) .AND. (j_xp .EQ. 0._xp)) THEN ! Ca20
+ Tmp = tau(ia) * kp_xp**2*(&
+ -SQRT2*twothird*moments(ia,ip0,ij0,iky,ikx,izi,updatetlevel)&
+ -2._xp*twothird*moments(ia,ip2,ij0,iky,ikx,izi,updatetlevel))
+ ELSEIF( (p_xp .EQ. 0._xp) .AND. (j_xp .EQ. 1._xp)) THEN ! Ca01
+ Tmp = tau(ia) * kp_xp**2*(&
+ 2._xp*twothird*moments(ia,ip0,ij0,iky,ikx,izi,updatetlevel)&
+ -2._xp*twothird*moments(ia,ip0,ij1,iky,ikx,izi,updatetlevel))
+ ELSE
+ Tmp = 0._xp
+ ENDIF
+ Capj(ia,ip,ij,iky,ikx,iz) = nu_ab(ia,ia) * Tmp
+ ENDDO
+ ENDDO
+ ENDDO
+ ENDDO
+ ENDDO
+ ENDDO
+ END SUBROUTINE compute_ivanov
+
!******************************************************************************!
!! Doughtery collision operator
!******************************************************************************!
@@ -191,10 +254,10 @@ CONTAINS
Tmp = -(p_xp + 2._xp*j_xp)*moments(ia,ipi,iji,iky,ikx,izi,updatetlevel)
IF( (p_xp .EQ. 1._xp) .AND. (j_xp .EQ. 0._xp)) THEN !Ce10
Tmp = Tmp + moments(ia,ip1,ij1,iky,ikx,iz,updatetlevel)
- ELSEIF( (p_xp .EQ. 2._xp) .AND. (j_xp .EQ. 0._xp)) THEN ! Ce20
+ ELSEIF( (p_xp .EQ. 2._xp) .AND. (j_xp .EQ. 0._xp)) THEN ! Ca20
Tmp = Tmp + twothird*moments(ia,ip2,ij0,iky,ikx,izi,updatetlevel) &
- SQRT2*twothird*moments(ia,ip0,ij1,iky,ikx,izi,updatetlevel)
- ELSEIF( (p_xp .EQ. 0._xp) .AND. (j_xp .EQ. 1._xp)) THEN ! Ce01
+ ELSEIF( (p_xp .EQ. 0._xp) .AND. (j_xp .EQ. 1._xp)) THEN ! Ca01
Tmp = Tmp + 2._xp*twothird*moments(ia,ip0,ij1,iky,ikx,izi,updatetlevel) &
-SQRT2*twothird*moments(ia,ip2,ij0,iky,ikx,izi,updatetlevel)
ENDIF