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mashuai222

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mashuai222: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2016-04-01 08:44:26
Õâ¸öµÃVASP±àÒëµÄʱºò°Ñconstr_cell_relax.FÕâ¸öÎļþÀïÃæµÄһЩ²ÎÊý×öһϸü¸Ä£¬±ÈÈ磺!-----------------------------------------------------------------------
!
! At present, VASP does not allow to relax the cellshape selectively
! i.e. for instance only cell relaxation in x direction.
! To be more precisse, this behaviour can not be achived via the INCAR
! or POSCAR file.
! However, it is possible to set selected components of the stress tensor
! to zero.
! The most conveninent position to do this is the routines
! CONSTR_CELL_RELAX  (constraint cell relaxation).
! FCELL contains the forces on the basis vectors.
! These forces are used to modify the basis vectors according
! to the following equations:
!
!      A_OLD(1:3,1:3)=A(1:3,1:3) ! F90 style
!      DO J=1,3
!      DO I=1,3
!      DO K=1,3
!        A(I,J)=A(I,J) + FCELL(I,K)*A_OLD(K,J)*STEP_SIZE
!      ENDDO
!      ENDDO
!      ENDDO
! where A holds the basis vectors (in cartesian coordinates).
!
!-----------------------------------------------------------------------

      SUBROUTINE CONSTR_CELL_RELAX(FCELL)
      USE prec
      REAL(q) FCELL(3,3)

£¡     orthorhombic system relaxation in a and b
      Saa=FCELL(1,1)
      Sbb=FCELL(2,2)
      FCELL=0
      FCELL(1,1)=Saa
      FCELL(2,2)=Sbb

!     just one simple example
!     relaxation in x directions only
!      SAVE=FCELL(1,1)
!      FCELL=0   ! F90 style: set the whole array to zero
!      FCELL(1,1)=SAVE
!     relaxation in z direction only
!      SAVE=FCELL(3,3)
!      FCELL=0   ! F90 style: set the whole array to zero
!      FCELL(3,3)=SAVE

      RETURN
      END SUBROUTINE
2Â¥2016-03-31 16:13:54
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû

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Ìú¸Ëľ³æ (ÖøÃûдÊÖ)

ÔÝʱÀ뿪Сľ³æ


¡¾´ð°¸¡¿Ó¦Öú»ØÌû

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ÔÞ¥ϣ¬ÐÞ¸Äconstr_cell_relax.F£¬ÖØÐ±àÒëvasp
3Â¥2016-03-31 21:25:20
ÒÑÔÄ   »Ø¸´´ËÂ¥   ¹Ø×¢TA ¸øTA·¢ÏûÏ¢ ËÍTAºì»¨ TAµÄ»ØÌû
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