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DAMASK_EICMD
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added simple preconditioning to improve convergence for high phase contrast materials in standard algorithm

This commit is contained in:
Pratheek Shanthraj 2012-04-20 09:42:57 +00:00
parent 5639648f54
commit c889d20ba0
1 changed files with 9 additions and 1 deletions
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10
code/DAMASK_spectral.f90
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@ -195,6 +195,7 @@ program DAMASK_spectral
real(pReal), dimension(:,:,:,:,:), allocatable :: F, F_lastInc
real(pReal), dimension(:,:,:,:), allocatable :: coordinates
real(pReal), dimension(:,:,:), allocatable :: temperature
real(pReal), dimension(:,:,:), allocatable :: phase_cont ! phase contrast field: C(x)/C_ref
!--------------------------------------------------------------------------------------------------
! variables storing information for spectral method and FFTW
@ -449,6 +450,7 @@ program DAMASK_spectral
allocate (xi (3,res1_red,res(2),res(3)), source = 0.0_pReal)
allocate (coordinates( res(1), res(2),res(3),3), source = 0.0_pReal)
allocate (temperature( res(1), res(2),res(3)), source = bc(1)%temperature) ! start out isothermally
allocate (phase_cont ( res(1), res(2),res(3)), source = 0.0_pReal)
tensorField = fftw_alloc_complex(int(res1_red*res(2)*res(3)*9_pInt,C_SIZE_T)) ! allocate continous data using a C function, C_SIZE_T is of type integer(8)
call c_f_pointer(tensorField, P_real, [ res(1)+2_pInt,res(2),res(3),3,3]) ! place a pointer for a real representation on tensorField
call c_f_pointer(tensorField, deltaF_real, [ res(1)+2_pInt,res(2),res(3),3,3]) ! place a pointer for a real representation on tensorField
@ -759,9 +761,11 @@ C_ref = C * wgt
temperature(i,j,k),timeinc,ielem,1_pInt,sigma,dsde, &
P_real(i,j,k,1:3,1:3),dPdF)
CPFEM_mode = 2_pInt
phase_cont(i,j,k) = maxval(dPdF)/maxval(C_ref)
C = C + dPdF
enddo; enddo; enddo
call debug_info()
write(6,'(a,es11.4)') 'Max phase contrast = ',maxval(phase_cont)
!--------------------------------------------------------------------------------------------------
! copy one component of the stress field to to a single FT and check for mismatch
@ -995,7 +999,11 @@ C_ref = C * wgt
!--------------------------------------------------------------------------------------------------
! updated deformation gradient
F = F - deltaF_real(1:res(1),1:res(2),1:res(3),1:3,1:3)*wgt ! F(x)^(n+1) = F(x)^(n) + correction; *wgt: correcting for missing normalization
do k = 1_pInt, res(3); do j = 1_pInt, res(2); do i = 1_pInt, res(1)
F(i,j,k,1:3,1:3) = F(i,j,k,1:3,1:3) - deltaF_real(i,j,k,1:3,1:3)*wgt/phase_cont(i,j,k) ! F(x)^(n+1) = F(x)^(n) + correction; *wgt: correcting for missing normalization
enddo; enddo; enddo ! preconditioning: F(x)^(n+1) = F(x)^(n) + correction/phase_contrast(x)
!--------------------------------------------------------------------------------------------------
! calculate bounds of det(F) and report