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!-----------------------------------------------------------------------------
!
!
SUBROUTINE upd_pos
!
!
!-----------------------------------------------------------------------------
!
!
! Subroutine to advance the positions of the bodies for a
! timestep dtime.
!
!-----------------------------------------------------------------------------
USE fly_h
implicit none
! Declaration of local variables.
! -------------------------------
INTEGER :: p,k
REAL(KIND=8) :: rsize4,delta_step
!-----------------------------------------------------------------------------
!
rsize4=rsize/4.
!-----------------------------------------------------------------------------
! Loop over all spatial coordinates for all bodies.
!-----------------------------------------------------------------------------
!$OMP PARALLEL PRIVATE(k,p, delta_step)
!$OMP DO
DO p=1,nb_res_loc(me+1)
DO k=1,ndim
delta_step=vel(k,p)*dtime
IF(ABS(delta_step).ge.rsize4) THEN
write(uterm,*)'SEVERE WARNING Delta_step =',delta_step, &
' Possible numerical instability pos(',k,',',p+idisp,') =',pos(k,p)
call flush(uterm)
ENDIF
IF(ABS(delta_step).eq.0) THEN
write(uterm,*)'SEVERE WARNING Delta_step =',delta_step,' dtime=',dtime, &
'vel(',k,',',p,')=',vel(k,p)
call flush(uterm)
ENDIF
pos(k,p)=pos(k,p)+delta_step
IF(pos(k,p).lt.rmin(k)) THEN
pos(k,p)=pos(k,p)+rsize
ENDIF
IF(pos(k,p).ge.rmin(k)+rsize) THEN
pos(k,p)=pos(k,p)-rsize
ENDIF
ENDDO
ENDDO
!$OMP END DO
!$OMP END PARALLEL
! Update position time, system time.
! ----------------------------------
tpos=tpos+dtime
tnow=tpos
znow=1./(tnow**(1./alpha))-1.
RETURN
END