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mashuai222: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2016-04-01 08:44:26
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mashuai222: ½ð±Ò+10, ¡ï¡ï¡ïºÜÓаïÖú 2016-04-01 08:44:26
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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
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3Â¥2016-03-31 21:25:20









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