viscos.f File Reference

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Functions/Subroutines
subroutine	viscos (inpc, textpart, nmethod, iperturb, isolver, istep, istat, n, tinc, tper, tmin, tmax, idrct, iline, ipol, inl, ipoinp, inp, ipoinpc, nelcon, nmat, ncmat_, ctrl)

Function/Subroutine Documentation

viscos()

subroutine viscos	(	character*1, dimension(*)	inpc,
		character*132, dimension(16)	textpart,
		integer	nmethod,
		integer	iperturb,
		integer	isolver,
		integer	istep,
		integer	istat,
		integer	n,
		real*8	tinc,
		real*8	tper,
		real*8	tmin,
		real*8	tmax,
		integer	idrct,
		integer	iline,
		integer	ipol,
		integer	inl,
		integer, dimension(2,*)	ipoinp,
		integer, dimension(3,*)	inp,
		integer, dimension(0:*)	ipoinpc,
		integer, dimension(2,*)	nelcon,
		integer	nmat,
		integer	ncmat_,
		real*8, dimension(*)	ctrl
	)

!
!     reading the input deck: *VISCO (provided for compatibility
!     reasons with ABAQUS)
!
!     isolver=0: SPOOLES
!             2: iterative solver with diagonal scaling
!             3: iterative solver with Cholesky preconditioning
!             4: sgi solver
!             5: TAUCS
!             7: pardiso
!
      implicit none
!
      character*1 inpc(*)
      character*20 solver
      character*132 textpart(16)
!
      integer nmethod,iperturb,isolver,istep,istat,n,key,i,idrct,
     &  iline,ipol,inl,ipoinp(2,*),inp(3,*),ipoinpc(0:*),nelcon(2,*),
     &  nmat,ncmat_
!
      real*8 tinc,tper,tmin,tmax,ctrl(*)
!
      idrct=0
      tmin=0.d0
      tmax=0.d0
!
      if((iperturb.eq.1).and.(istep.gt.1)) then
         write(*,*) '*ERROR reading *VISCO: perturbation analysis is'
         write(*,*) '       not provided in a *VISCO step. Perform'
         write(*,*) '       a genuine nonlinear geometric calculation'
         write(*,*) '       instead (parameter NLGEOM)'
         call exit(201)
      endif
!
      if(istep.lt.1) then
         write(*,*) '*ERROR reading *VISCO: *VISCO can only be used'
         write(*,*) '  within a STEP'
         call exit(201)
      endif
!
!     default solver
!
      solver='                    '
      if(isolver.eq.0) then
         solver(1:7)='SPOOLES'
      elseif(isolver.eq.2) then
         solver(1:16)='ITERATIVESCALING'
      elseif(isolver.eq.3) then
         solver(1:17)='ITERATIVECHOLESKY'
      elseif(isolver.eq.4) then
         solver(1:3)='SGI'
      elseif(isolver.eq.5) then
         solver(1:5)='TAUCS'
      elseif(isolver.eq.7) then
         solver(1:7)='PARDISO'
      endif
!
      do i=2,n
         if(textpart(i)(1:7).eq.'SOLVER=') then
            read(textpart(i)(8:27),'(a20)') solver
         elseif((textpart(i)(1:6).eq.'DIRECT').and.
     &          (textpart(i)(1:9).ne.'DIRECT=NO')) then
            idrct=1
         elseif(textpart(i)(1:6).eq.'CETOL=') then
            read(textpart(i)(7:26),'(f20.0)',iostat=istat) ctrl(40)
            if(istat.gt.0) call inputerror(inpc,ipoinpc,iline,
     &"*VISCO%")
         else
            write(*,*) 
     &        '*WARNING reading *VISCO: parameter not recognized:'
            write(*,*) '         ',
     &                 textpart(i)(1:index(textpart(i),' ')-1)
            call inputwarning(inpc,ipoinpc,iline,
     &"*VISCO%")
         endif
      enddo
!
      if(ctrl(40).le.0.d0) then
         write(*,*) '*ERROR reading *VISCO:'
         write(*,*) '       no strictly positive value'
         write(*,*) '       for the parameter CETOL given'
         call exit(201)
      endif
!
      if(solver(1:7).eq.'SPOOLES') then
         isolver=0
      elseif(solver(1:16).eq.'ITERATIVESCALING') then
         isolver=2
      elseif(solver(1:17).eq.'ITERATIVECHOLESKY') then
         isolver=3
      elseif(solver(1:3).eq.'SGI') then
         isolver=4
      elseif(solver(1:5).eq.'TAUCS') then
         isolver=5
      elseif(solver(1:7).eq.'PARDISO') then
         isolver=7
      else
         write(*,*) '*WARNING reading *VISCO: unknown solver;'
         write(*,*) '         the default solver is used'
      endif
!
      nmethod=-1
!
      call getnewline(inpc,textpart,istat,n,key,iline,ipol,inl,
     &     ipoinp,inp,ipoinpc)
      if((istat.lt.0).or.(key.eq.1)) then
         if(iperturb.ge.2) then
            write(*,*) '*WARNING reading *VISCO: a nonlinear analysis is
     & requested'
            write(*,*) '         but no time increment nor step is speci
     &fied'
            write(*,*) '         the defaults (1,1) are used'
            tinc=1.d0
            tper=1.d0
            tmin=1.d-5
            tmax=1.d+30
         endif
         return
      endif
!
      read(textpart(1)(1:20),'(f20.0)',iostat=istat) tinc
      if(istat.gt.0) call inputerror(inpc,ipoinpc,iline,
     &"*VISCO%")
      read(textpart(2)(1:20),'(f20.0)',iostat=istat) tper
      if(istat.gt.0) call inputerror(inpc,ipoinpc,iline,
     &"*VISCO%")
      read(textpart(3)(1:20),'(f20.0)',iostat=istat) tmin
      if(istat.gt.0) call inputerror(inpc,ipoinpc,iline,
     &"*VISCO%")
      read(textpart(4)(1:20),'(f20.0)',iostat=istat) tmax
      if(istat.gt.0) call inputerror(inpc,ipoinpc,iline,
     &"*VISCO%")
!
      if(tinc.le.0.d0) then
         write(*,*) '*ERROR reading *VISCO: initial increment size is ne
     &gative'
      endif
      if(tper.le.0.d0) then
         write(*,*) '*ERROR reading *VISCO: step size is negative'
      endif
      if(tinc.gt.tper) then
         write(*,*) '*ERROR reading *VISCO: initial increment size excee
     &ds step size'
      endif
!      
      if(idrct.ne.1) then
         if(dabs(tmin).lt.1.d-6*tper) then
            tmin=min(tinc,1.d-6*tper)
         endif
         if(dabs(tmax).lt.1.d-10) then
            tmax=1.d+30
         if(tinc.gt.dabs(tmax)) then
            write(*,*) '*WARNING reading *VISCO:'
            write(*,*) '         the initial increment ',tinc
            write(*,*) '         exceeds the maximum increment ',
     &          tmax
            write(*,*) '         the initial increment is reduced'
            write(*,*) '         to the maximum value'
            tinc=dabs(tmax)
         endif
         endif
      endif
!
      call getnewline(inpc,textpart,istat,n,key,iline,ipol,inl,
     &     ipoinp,inp,ipoinpc)
!
      return