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root/group/trunk/OOPSE/libmdtools/calc_reaction_field.F90
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Comparing trunk/OOPSE/libmdtools/calc_reaction_field.F90 (file contents):
Revision 460 by chuckv, Fri Apr 4 22:22:30 2003 UTC vs.
Revision 611 by gezelter, Tue Jul 15 17:10:50 2003 UTC

# Line 236 | Line 236 | contains
236   #endif
237        
238         if (do_stress) then          
239 <          tau_Temp(1) = tau_Temp(1) + dudx * d(1)
240 <          tau_Temp(2) = tau_Temp(2) + dudx * d(2)
241 <          tau_Temp(3) = tau_Temp(3) + dudx * d(3)
242 <          tau_Temp(4) = tau_Temp(4) + dudy * d(1)
243 <          tau_Temp(5) = tau_Temp(5) + dudy * d(2)
244 <          tau_Temp(6) = tau_Temp(6) + dudy * d(3)
245 <          tau_Temp(7) = tau_Temp(7) + dudz * d(1)
246 <          tau_Temp(8) = tau_Temp(8) + dudz * d(2)
247 <          tau_Temp(9) = tau_Temp(9) + dudz * d(3)
248 <          virial_Temp = virial_Temp + (tau_Temp(1) + tau_Temp(5) + tau_Temp(9))
239 >          if (molMembershipList(atom1) .ne. molMembershipList(atom2)) then
240 >
241 >             ! because the d vector is the rj - ri vector, and
242 >             ! because dudx, dudy, and dudz are the
243 >             ! (positive) force on atom i (negative on atom j) we need
244 >             ! a negative sign here:
245 >
246 >             tau_Temp(1) = tau_Temp(1) - d(1) * dudx
247 >             tau_Temp(2) = tau_Temp(2) - d(1) * dudy
248 >             tau_Temp(3) = tau_Temp(3) - d(1) * dudz
249 >             tau_Temp(4) = tau_Temp(4) - d(2) * dudx
250 >             tau_Temp(5) = tau_Temp(5) - d(2) * dudy
251 >             tau_Temp(6) = tau_Temp(6) - d(2) * dudz
252 >             tau_Temp(7) = tau_Temp(7) - d(3) * dudx
253 >             tau_Temp(8) = tau_Temp(8) - d(3) * dudy
254 >             tau_Temp(9) = tau_Temp(9) - d(3) * dudz
255 >             virial_Temp = virial_Temp + &
256 >                  (tau_Temp(1) + tau_Temp(5) + tau_Temp(9))
257 >          endif
258         endif      
259      endif
260      

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