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corrected calculation of curl (last version was more a dummy function)

This commit is contained in:
Martin Diehl 2011-12-23 12:23:13 +00:00
parent e62d083f7a
commit 99fa0e0be8
1 changed files with 11 additions and 7 deletions
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code/math.f90
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@ -3274,8 +3274,9 @@ subroutine curl_fft(res,geomdim,vec_tens,field,curl_field)
complex(pReal), dimension(res(1)/2_pInt+1_pInt,res(2),res(3),3,vec_tens) :: curl_field_fft
real(pReal), dimension(res(1)/2_pInt+1_pInt,res(2),res(3),3) :: xi
! other variables
integer(pInt) i, j, k
integer(pInt) i, j, k, l
integer*8 :: plan_fft(2)
complex(pReal), parameter :: img =cmplx(0.0_pReal,1.0_pReal)
print*, 'Calculating curl of vector/tensor field'
print '(a,/,e12.5,e12.5,e12.5)', ' Dimension:', geomdim
@ -3305,13 +3306,16 @@ subroutine curl_fft(res,geomdim,vec_tens,field,curl_field)
do k = 1, res(3)
do j = 1, res(2)
do i = 1, res(1)/2+1
curl_field_fft(i,j,k,1,vec_tens) = sum(field_fft(i,j,k,1,:)*xi(i,j,k,:))
if(vec_tens == 3) then
curl_field_fft (i,j,k,2,vec_tens) = sum(field_fft(i,j,k,2,:)*xi(i,j,k,:))
curl_field_fft(i,j,k,3,vec_tens) = sum(field_fft(i,j,k,3,:)*xi(i,j,k,:))
endif
do l = 1, vec_tens
curl_field_fft(i,j,k,1,l) =( field_fft(i,j,k,3,l)*xi(i,j,k,2) - field_fft(i,j,k,2,l)*xi(i,j,k,3))&
*img*pi*2.0_pReal
curl_field_fft(i,j,k,2,l) =(- field_fft(i,j,k,3,l)*xi(i,j,k,1) + field_fft(i,j,k,1,l)*xi(i,j,k,3))&
*img*pi*2.0_pReal
curl_field_fft(i,j,k,3,l) =( field_fft(i,j,k,2,l)*xi(i,j,k,1) - field_fft(i,j,k,1,l)*xi(i,j,k,2))&
*img*pi*2.0_pReal
enddo
enddo; enddo; enddo
! divergence_field_fft = divergence_field_fft*img*2.0*pi
call dfftw_execute_dft_c2r(plan_fft(2), curl_field_fft, curl_field)