table_dyn.f90

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!-------------------------------------------------------------------------------
! Copyright (c) 2019 FrontISTR Commons
! This software is released under the MIT License, see LICENSE.txt
!-------------------------------------------------------------------------------
module m_table_dyn
 
  use m_fstr
  use hecmw
 
  implicit none
 
contains
 
  !C================================================================C
  !C-- subroutine table_dyn
  !C================================================================C
  subroutine table_dyn(hecMESH, fstrSOLID, fstrDYNAMIC, ig0, t_curr, f_t, flag_u)
    type(hecmwst_local_mesh) :: hecMESH
    type(fstr_solid)         :: fstrSOLID
    type(fstr_dynamic)       :: fstrDYNAMIC
    integer(kind=kint)       :: ig0
    real(kind=kreal)         :: t_curr
    real(kind=kreal)         :: f_t
    integer(kind=kint)       :: flag_u
 
    integer(kind=kint) :: i
    integer(kind=kint) :: jj_n_amp, jj1, jj2
    integer(kind=kint) :: s1, s2
    real(kind=kreal)   :: t_1, t_2, t_t, f_1, f_2
 
    jj_n_amp = 0
    s1 = 0; s2 = 0
    t_1 = 0.0d0; t_2 = 0.0d0; t_t = 0.0d0; f_1 = 0.0d0; f_2 = 0.0d0; f_t = 0.0d0
 
    if( flag_u .eq. 1 ) then
      jj_n_amp = fstrsolid%BOUNDARY_ngrp_amp(ig0)
    else if( flag_u .eq. 2 ) then
      jj_n_amp = fstrsolid%VELOCITY_ngrp_amp(ig0)
    else if( flag_u .eq. 3 ) then
      jj_n_amp = fstrsolid%ACCELERATION_ngrp_amp(ig0)
    else if( flag_u .eq. 0 ) then
      jj_n_amp = fstrsolid%CLOAD_ngrp_amp(ig0)
    else if( flag_u .eq. 10 ) then
      jj_n_amp = fstrsolid%DLOAD_ngrp_amp(ig0)
    end if
 
    if( jj_n_amp == 0 ) then
      f_t = 1.d0
    else
 
      jj1 = hecmesh%amp%amp_index(jj_n_amp - 1)
      jj2 = hecmesh%amp%amp_index(jj_n_amp)
 
      jj1 = jj1 + 2
      if( fstrdynamic%idx_eqa == 1 ) then
        t_t = t_curr
 
      else if( fstrdynamic%idx_eqa == 11 ) then
        select case (flag_u)
          case (0)
            t_t = t_curr - fstrdynamic%t_delta
          case (10)
            t_t = t_curr - fstrdynamic%t_delta
          case (1)
            t_t = t_curr - fstrdynamic%t_delta
          case (2)
            t_t = t_curr - fstrdynamic%t_delta
          case (3)
            t_t = t_curr - fstrdynamic%t_delta
        end select
      end if
 
      if(t_t .gt. hecmesh%amp%amp_table(jj2)) then
        f_t = hecmesh%amp%amp_val(jj2)
      else if(t_t .le. hecmesh%amp%amp_table(jj2)) then
        do i = jj1, jj2
          if(t_t .le. hecmesh%amp%amp_table(i)) then
            s2 = i
            s1 = i - 1
            exit
          end if
        end do
 
        t_2 = hecmesh%amp%amp_table(s2)
        t_1 = hecmesh%amp%amp_table(s1)
        f_2 = hecmesh%amp%amp_val(s2)
        f_1 = hecmesh%amp%amp_val(s1)
        if( t_2-t_1 .lt. 1.0e-20) then
          if( hecmesh%my_rank.eq.0) then
            write(imsg,*) 'stop due to t_2-t_1 <= 0'
          end if
          call hecmw_abort( hecmw_comm_get_comm())
        end if
        f_t = ((t_2*f_1 - t_1*f_2) + (f_2 - f_1)*t_t) / (t_2 - t_1)
      end if
 
    end if
 
  end subroutine table_dyn
 
end module m_table_dyn