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adm.f90
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adm.f90
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module actuator_disc_model
! Use the actuator_line Modules
use decomp_2d, only: mytype, nrank
use actuator_line_model_utils
use airfoils
implicit none
type ActuatorDiscType
integer :: ID ! Actuator disk ID
real(mytype) :: D ! Actuator disk diameter
real(mytype) :: COR(3) ! Center of Rotation
real(mytype) :: RotN(3) ! axis of rotation
real(mytype) :: CT ! Thrust coefficient
real(mytype) :: alpha ! Induction coefficient
real(mytype) :: Udisc ! Disc-averaged velocity
real(mytype) :: UF ! Disc-averaged velocity -- filtered
real(mytype) :: UF_prev ! Disc-averaged velocity -- filtered previous
real(mytype) :: Power
real(mytype) :: Udisc_ave=0.0_mytype
real(mytype) :: Power_ave=0.0_mytype
end type ActuatorDiscType
type(ActuatorDiscType), allocatable, save :: ActuatorDisc(:)
integer,save :: Nad ! Number of the actuator disk turbines
contains
subroutine actuator_disc_model_init(Ndiscs,admCoords,iadmmode,CT,aind,fileADM)
USE var, only: Fdiscx, Fdiscy, Fdiscz, GammaDisc
USE decomp_2d
USE decomp_2d_io
USE MPI
implicit none
integer,intent(in) :: Ndiscs
character(len=100),intent(in) :: admCoords, fileADM
character(1000) :: ReadLine
integer,intent(in) :: iadmmode
real(mytype) :: CT, aind
integer :: idisc
!### Specify the actuator discs
Nad=Ndiscs
if (nrank==0) then
print *, "============================================================================================================="
print *, " The actuator disc model is enabled"
print *, 'Number of Actuator discs : ', Nad
endif
if (Nad>0) then
allocate(ActuatorDisc(Nad))
open(15,file=admCoords)
do idisc=1,Nad
actuatordisc(idisc)%ID=idisc
read(15,'(A)') ReadLine
read(Readline,*) ActuatorDisc(idisc)%COR(1),ActuatorDisc(idisc)%COR(2),ActuatorDisc(idisc)%COR(3),ActuatorDisc(idisc)%RotN(1),ActuatorDisc(idisc)%RotN(2),ActuatorDisc(idisc)%RotN(3),ActuatorDisc(idisc)%D
!if (nrank==0) then
! print *, 'actuator ', idisc, ' --> (X,Y,Z)= ',ActuatorDisc(idisc)%COR(1), ActuatorDisc(idisc)%COR(2),ActuatorDisc(idisc)%COR(3)
! print *, ' Axis = ',ActuatorDisc(idisc)%RotN(1), ActuatorDisc(idisc)%RotN(2),ActuatorDisc(idisc)%RotN(3)
! print *, ' Diameter = ',ActuatorDisc(idisc)%D
!endif
if(iadmmode==0) then
ActuatorDisc(idisc)%CT=CT
ActuatorDisc(idisc)%alpha=aind
else if(iadmmode==1) then
if(nrank==0) print *, "not available yet"
stop
endif
enddo
close(15)
endif
!### Create the source term
return
end subroutine actuator_disc_model_init
subroutine actuator_disc_model_compute_source(ux1,uy1,uz1)
use decomp_2d, only: mytype, nproc, xstart, xend, xsize, update_halo
use MPI
use param, only: dx,dy,dz,eps_factor,xnu,yp,istret,xlx,yly,zlz,dt,u1,u2,iverifyadm,itime,ustar,dBL, spinup_time
use var, only: FDiscx, FDiscy, FDiscz, GammaDisc
implicit none
real(mytype), dimension(xsize(1),xsize(2),xsize(3)) :: ux1, uy1, uz1
real(mytype) :: xmesh, ymesh,zmesh,deltax,deltay,deltaz,deltar,dr,gamma_disc_partial,Heaviside,DiscsTotalArea
real(mytype) :: uave,CTprime, T_relax, alpha_relax, Uinf, CTave,Ratio,sumforce,Sumforce_partial
real(mytype) :: Delta, DeltaSmoothing
real(mytype), allocatable, dimension(:) :: Udisc_partial
integer,allocatable, dimension(:) :: counter, counter_total
integer :: i,j,k, idisc, ierr
! First compute Gamma
GammaDisc=0.
do idisc=1,Nad
do k=1,xsize(3)
zmesh=(xstart(3)+k-1-1)*dz
do j=1,xsize(2)
if (istret.eq.0) ymesh=(xstart(2)+j-1-1)*dy
if (istret.ne.0) ymesh=yp(xstart(2)+j)
do i=1,xsize(1)
xmesh=(xstart(1)+i-1-1)*dx
deltax=abs(xmesh-actuatordisc(idisc)%COR(1))
deltay=abs(ymesh-actuatordisc(idisc)%COR(2))
deltaz=abs(zmesh-actuatordisc(idisc)%COR(3))
deltar=sqrt(deltay**2.+deltaz**2.)
Delta=sqrt(dy**2.+dz**2.)
DeltaSmoothing=2.5*Delta
dr=sqrt(dy**2.+dz**2.)
if(deltax>dx/2.) then
GammaDisc(i,j,k)=0.
elseif (deltax<=dx/2.) then
if(deltar<=actuatordisc(idisc)%D/2.0) then
GammaDisc(i,j,k)=1.
elseif(deltar>actuatordisc(idisc)%D/2..and. deltar<=actuatordisc(idisc)%D/2.+dr) then
GammaDisc(i,j,k)=1.-(deltar-actuatordisc(idisc)%D/2.)/dr
else
GammaDisc(i,j,k)=0.
endif
endif
enddo
enddo
enddo
enddo
! Then compute disc-averaged velocity
allocate(Udisc_partial(Nad))
allocate(counter(Nad))
allocate(counter_total(Nad))
do idisc=1,Nad
uave=0.
counter(idisc)=0
counter_total(idisc)=0.
do k=1,xsize(3)
zmesh=(xstart(3)+k-1-1)*dz
do j=1,xsize(2)
if (istret.eq.0) ymesh=(xstart(2)+j-1-2)*dy
if (istret.ne.0) ymesh=yp(xstart(2)+j)
do i=1,xsize(1)
xmesh=(i-1)*dx
deltax=abs(xmesh-actuatordisc(idisc)%COR(1))
deltay=abs(ymesh-actuatordisc(idisc)%COR(2))
deltaz=abs(zmesh-actuatordisc(idisc)%COR(3))
deltar=sqrt(deltay**2.+deltaz**2.)
dr=sqrt(dy**2.+dz**2.)
if(deltar<=actuatordisc(idisc)%D/2.) then
! Take the inner product to compute the rotor-normal velocity
uave=uave+&!sqrt(ux1(i,j,k)**2.+uy1(i,j,k)**2.+uz1(i,j,k)**2.)
ux1(i,j,k)*actuatordisc(idisc)%RotN(1)+&
uy1(i,j,k)*actuatordisc(idisc)%RotN(2)+&
uz1(i,j,k)*actuatordisc(idisc)%RotN(3)
counter(idisc)=counter(idisc)+1
endif
enddo
enddo
enddo
Udisc_partial(idisc)=uave
enddo
call MPI_ALLREDUCE(Udisc_partial,actuatordisc%Udisc,Nad,MPI_REAL8,MPI_SUM, &
MPI_COMM_WORLD,ierr)
call MPI_ALLREDUCE(counter,counter_total,Nad,MPI_INTEGER,MPI_SUM, &
MPI_COMM_WORLD,ierr)
do idisc=1,Nad
if (counter_total(idisc)==0) then
print *, 'counter=0 for the disc --- something is wrong with the disc number: ', idisc
stop
endif
actuatordisc(idisc)%Udisc=actuatordisc(idisc)%Udisc/counter_total(idisc)
if (nrank==0) print *, actuatordisc(idisc)%Udisc
enddo
deallocate(Udisc_partial,counter,counter_total)
! Time relaxation -- low pass filter
if (itime==0) then
do idisc=1,Nad
actuatordisc(idisc)%UF=actuatordisc(idisc)%Udisc
actuatordisc(idisc)%UF_prev=actuatordisc(idisc)%Udisc
enddo
else
do idisc=1,Nad
T_relax= 5.! 0.27*dBL/ustar
alpha_relax=(dt/T_relax)/(1.+dt/T_relax)
actuatordisc(idisc)%UF=alpha_relax*actuatordisc(idisc)%UF+(1.-alpha_relax)*actuatordisc(idisc)%UF_prev
actuatordisc(idisc)%UF_prev=actuatordisc(idisc)%Udisc
enddo
endif
! Compute the forces
do idisc=1,Nad
CTprime=actuatordisc(idisc)%CT/(1-actuatordisc(idisc)%alpha)**2.
! Compute power
actuatordisc(idisc)%Power=0.5_mytype*CTprime*actuatordisc(idisc)%UF**2.0_mytype*actuatordisc(idisc)%Udisc&
*pi*actuatordisc(idisc)%D**2._mytype/4._mytype*0.432_mytype/0.56_mytype
Fdiscx(:,:,:)=-0.5_mytype*CTprime*actuatordisc(idisc)%UF**2.0_mytype*GammaDisc(:,:,:)/dx
Fdiscy(:,:,:)=0.
Fdiscz(:,:,:)=0.
enddo
! Check if the total disc actuator disc F_t is equal to
if(iverifyadm.eq.1) then
sumforce=0.
do k=1,xsize(3)
do j=1,xsize(2)
do i=1,xsize(1)
sumforce_partial=sumforce_partial+Fdiscx(i,j,k)
enddo
enddo
enddo
call MPI_ALLREDUCE(Sumforce_partial,sumforce,1,MPI_REAL8,MPI_SUM, &
MPI_COMM_WORLD,ierr)
do idisc=1,Nad
DiscsTotalArea=DiscsTotalArea+pi/4.0_mytype*actuatordisc(idisc)%D**2.0_mytype
enddo
CTave=sum(actuatordisc%CT)/Nad
Uinf=sum(actuatordisc%UF)/Nad
Ratio=sumforce*dx*dy*dz/(-0.5*CTprime*Uinf**2*DiscsTotalArea)
if (nrank==0) print *, 'ADM verification ratio', Ratio
endif
! Compute the average values after spin_up time
if(itime*dt>=spinup_time) then
do idisc=1,Nad
actuatordisc(idisc)%Udisc_ave=actuatordisc(idisc)%Udisc_ave+actuatordisc(idisc)%Udisc
actuatordisc(idisc)%Power_ave=actuatordisc(idisc)%Power_ave+actuatordisc(idisc)%Power
enddo
endif
return
end subroutine actuator_disc_model_compute_source
subroutine actuator_disc_model_write_output(dump_no)
implicit none
integer,intent(in) :: dump_no
integer :: idisc
character(len=100) :: dir, Format
if (Nad>0) then
open(2020,File='discs_time'//trim(int2str(dump_no))//'.adm')
write(2020,*) 'Udisc, CT, Power, Udisc_ave, Power_ave'
Format="(5(E14.7,A))"
do idisc=1,Nad
write(2020,Format) actuatordisc(idisc)%Udisc,',',actuatordisc(idisc)%CT,',',actuatordisc(idisc)%Power,',',actuatordisc(idisc)%Udisc_ave,',',actuatordisc(idisc)%Power_ave
end do
close(2020)
endif
return
end subroutine actuator_disc_model_write_output
end module actuator_disc_model