| 1 |
module reaction_field |
| 2 |
use force_globals |
| 3 |
use definitions |
| 4 |
use atype_module |
| 5 |
use vector_class |
| 6 |
use simulation |
| 7 |
#ifdef IS_MPI |
| 8 |
use mpiSimulation |
| 9 |
#endif |
| 10 |
implicit none |
| 11 |
|
| 12 |
real(kind=dp), save :: rrf |
| 13 |
real(kind=dp), save :: rt |
| 14 |
real(kind=dp), save :: dielect |
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real(kind=dp), save :: rrfsq |
| 16 |
real(kind=dp), save :: pre |
| 17 |
logical, save :: rf_initialized = .false. |
| 18 |
|
| 19 |
contains |
| 20 |
|
| 21 |
subroutine initialize_rf(this_rrf, this_rt, this_dielect) |
| 22 |
real(kind=dp), intent(in) :: this_rrf, this_rt, this_dielect |
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|
| 24 |
rrf = this_rrf |
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rt = this_rt |
| 26 |
dielect = this_dielect |
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|
| 28 |
rrfsq = rrf * rrf |
| 29 |
pre = 14.38362d0*2.0d0*(dielect-1.0d0)/((2.0d0*dielect+1.0d0)*rrfsq*rrf) |
| 30 |
|
| 31 |
|
| 32 |
write(*,*) 'rrf = ', rrf |
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write(*,*) 'rt = ', rt |
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write(*,*) 'dielect = ', dielect |
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write(*,*) 'pre = ', pre |
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rf_initialized = .true. |
| 37 |
|
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return |
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end subroutine initialize_rf |
| 40 |
|
| 41 |
subroutine accumulate_rf(atom1, atom2, rij, u_l) |
| 42 |
|
| 43 |
integer, intent(in) :: atom1, atom2 |
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real (kind = dp), intent(in) :: rij |
| 45 |
real (kind = dp), dimension(3,getNlocal()) :: u_l |
| 46 |
|
| 47 |
integer :: me1, me2 |
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real (kind = dp) :: taper, mu1, mu2 |
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real (kind = dp), dimension(3) :: ul1 |
| 50 |
real (kind = dp), dimension(3) :: ul2 |
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|
| 52 |
if (.not.rf_initialized) then |
| 53 |
write(default_error,*) 'Reaction field not initialized!' |
| 54 |
return |
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endif |
| 56 |
|
| 57 |
if (rij.le.rrf) then |
| 58 |
|
| 59 |
if (rij.lt.rt) then |
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taper = 1.0d0 |
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else |
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taper = (rrf + 2.0d0*rij - 3.0d0*rt)*(rrf-rij)**2/ ((rrf-rt)**3) |
| 63 |
endif |
| 64 |
|
| 65 |
#ifdef IS_MPI |
| 66 |
me1 = atid_Row(atom1) |
| 67 |
ul1(1) = u_l_Row(1,atom1) |
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ul1(2) = u_l_Row(2,atom1) |
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ul1(3) = u_l_Row(3,atom1) |
| 70 |
|
| 71 |
me2 = atid_Col(atom2) |
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ul2(1) = u_l_Col(1,atom2) |
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ul2(2) = u_l_Col(2,atom2) |
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ul2(3) = u_l_Col(3,atom2) |
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#else |
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me1 = atid(atom1) |
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ul1(1) = u_l(1,atom1) |
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ul1(2) = u_l(2,atom1) |
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ul1(3) = u_l(3,atom1) |
| 80 |
|
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me2 = atid(atom2) |
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ul2(1) = u_l(1,atom2) |
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ul2(2) = u_l(2,atom2) |
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ul2(3) = u_l(3,atom2) |
| 85 |
#endif |
| 86 |
|
| 87 |
call getElementProperty(atypes, me1, "dipole_moment", mu1) |
| 88 |
call getElementProperty(atypes, me2, "dipole_moment", mu2) |
| 89 |
|
| 90 |
|
| 91 |
#ifdef IS_MPI |
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rf_Row(1,atom1) = rf_Row(1,atom1) + ul2(1)*mu2*taper |
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rf_Row(2,atom1) = rf_Row(2,atom1) + ul2(2)*mu2*taper |
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rf_Row(3,atom1) = rf_Row(3,atom1) + ul2(3)*mu2*taper |
| 95 |
|
| 96 |
rf_Col(1,atom2) = rf_Col(1,atom2) + ul1(1)*mu1*taper |
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rf_Col(2,atom2) = rf_Col(2,atom2) + ul1(2)*mu1*taper |
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rf_Col(3,atom2) = rf_Col(3,atom2) + ul1(3)*mu1*taper |
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#else |
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rf(1,atom1) = rf(1,atom1) + ul2(1)*mu2*taper |
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rf(2,atom1) = rf(2,atom1) + ul2(2)*mu2*taper |
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rf(3,atom1) = rf(3,atom1) + ul2(3)*mu2*taper |
| 103 |
|
| 104 |
rf(1,atom2) = rf(1,atom2) + ul1(1)*mu1*taper |
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rf(2,atom2) = rf(2,atom2) + ul1(2)*mu1*taper |
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rf(3,atom2) = rf(3,atom2) + ul1(3)*mu1*taper |
| 107 |
#endif |
| 108 |
|
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endif |
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return |
| 111 |
end subroutine accumulate_rf |
| 112 |
|
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subroutine accumulate_self_rf(atom1, mu1, u_l) |
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|
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integer, intent(in) :: atom1 |
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real(kind=dp), intent(in) :: mu1 |
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real(kind=dp), dimension(3,getNlocal()) :: u_l |
| 118 |
|
| 119 |
!! should work for both MPI and non-MPI version since this is not pairwise. |
| 120 |
rf(1,atom1) = rf(1,atom1) + u_l(1,atom1)*mu1 |
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rf(2,atom1) = rf(2,atom1) + u_l(2,atom1)*mu1 |
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rf(3,atom1) = rf(3,atom1) + u_l(3,atom1)*mu1 |
| 123 |
|
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return |
| 125 |
end subroutine accumulate_self_rf |
| 126 |
|
| 127 |
subroutine reaction_field_final(a1, mu1, u_l, rfpot, t, do_pot) |
| 128 |
|
| 129 |
integer, intent(in) :: a1 |
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real (kind=dp), intent(in) :: mu1 |
| 131 |
real (kind=dp), intent(inout) :: rfpot |
| 132 |
logical, intent(in) :: do_pot |
| 133 |
real (kind = dp), dimension(3,getNlocal()) :: u_l |
| 134 |
real (kind = dp), dimension(3,getNlocal()) :: t |
| 135 |
|
| 136 |
if (.not.rf_initialized) then |
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write(default_error,*) 'Reaction field not initialized!' |
| 138 |
return |
| 139 |
endif |
| 140 |
|
| 141 |
! compute torques on dipoles: |
| 142 |
! pre converts from mu in units of debye to kcal/mol |
| 143 |
|
| 144 |
! The torque contribution is dipole cross reaction_field |
| 145 |
|
| 146 |
t(1,a1) = t(1,a1) + pre*mu1*(u_l(2,a1)*rf(3,a1) - u_l(3,a1)*rf(2,a1)) |
| 147 |
t(2,a1) = t(2,a1) + pre*mu1*(u_l(3,a1)*rf(1,a1) - u_l(1,a1)*rf(3,a1)) |
| 148 |
t(3,a1) = t(3,a1) + pre*mu1*(u_l(1,a1)*rf(2,a1) - u_l(2,a1)*rf(1,a1)) |
| 149 |
|
| 150 |
! the potential contribution is -1/2 dipole dot reaction_field |
| 151 |
|
| 152 |
if (do_pot) then |
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rfpot = rfpot - 0.5d0 * pre * mu1 * & |
| 154 |
(rf(1,a1)*u_l(1,a1) + rf(2,a1)*u_l(2,a1) + rf(3,a1)*u_l(3,a1)) |
| 155 |
endif |
| 156 |
|
| 157 |
return |
| 158 |
end subroutine reaction_field_final |
| 159 |
|
| 160 |
subroutine rf_correct_forces(atom1, atom2, d, rij, u_l, f, do_stress) |
| 161 |
|
| 162 |
integer, intent(in) :: atom1, atom2 |
| 163 |
real(kind=dp), dimension(3), intent(in) :: d |
| 164 |
real(kind=dp), intent(in) :: rij |
| 165 |
real( kind = dp ), dimension(3,getNlocal()) :: u_l |
| 166 |
real( kind = dp ), dimension(3,getNlocal()) :: f |
| 167 |
logical, intent(in) :: do_stress |
| 168 |
|
| 169 |
real (kind = dp), dimension(3) :: ul1 |
| 170 |
real (kind = dp), dimension(3) :: ul2 |
| 171 |
real (kind = dp) :: dtdr |
| 172 |
real (kind = dp) :: dudx, dudy, dudz, u1dotu2 |
| 173 |
integer :: me1, me2 |
| 174 |
real (kind = dp) :: mu1, mu2 |
| 175 |
|
| 176 |
if (.not.rf_initialized) then |
| 177 |
write(default_error,*) 'Reaction field not initialized!' |
| 178 |
return |
| 179 |
endif |
| 180 |
|
| 181 |
if (rij.le.rrf) then |
| 182 |
|
| 183 |
if (rij.lt.rt) then |
| 184 |
dtdr = 0.0d0 |
| 185 |
else |
| 186 |
dtdr = 6.0d0*(rij*rij - rij*rt - rij*rrf +rrf*rt)/((rrf-rt)**3) |
| 187 |
endif |
| 188 |
|
| 189 |
#ifdef IS_MPI |
| 190 |
me1 = atid_Row(atom1) |
| 191 |
ul1(1) = u_l_Row(1,atom1) |
| 192 |
ul1(2) = u_l_Row(2,atom1) |
| 193 |
ul1(3) = u_l_Row(3,atom1) |
| 194 |
|
| 195 |
me2 = atid_Col(atom2) |
| 196 |
ul2(1) = u_l_Col(1,atom2) |
| 197 |
ul2(2) = u_l_Col(2,atom2) |
| 198 |
ul2(3) = u_l_Col(3,atom2) |
| 199 |
#else |
| 200 |
me1 = atid(atom1) |
| 201 |
ul1(1) = u_l(1,atom1) |
| 202 |
ul1(2) = u_l(2,atom1) |
| 203 |
ul1(3) = u_l(3,atom1) |
| 204 |
|
| 205 |
me2 = atid(atom2) |
| 206 |
ul2(1) = u_l(1,atom2) |
| 207 |
ul2(2) = u_l(2,atom2) |
| 208 |
ul2(3) = u_l(3,atom2) |
| 209 |
#endif |
| 210 |
|
| 211 |
call getElementProperty(atypes, me1, "dipole_moment", mu1) |
| 212 |
call getElementProperty(atypes, me2, "dipole_moment", mu2) |
| 213 |
|
| 214 |
u1dotu2 = ul1(1)*ul2(1) + ul1(2)*ul2(2) + ul1(3)*ul2(3) |
| 215 |
|
| 216 |
dudx = - pre*mu1*mu2*u1dotu2*dtdr*d(1)/rij |
| 217 |
dudy = - pre*mu1*mu2*u1dotu2*dtdr*d(2)/rij |
| 218 |
dudz = - pre*mu1*mu2*u1dotu2*dtdr*d(3)/rij |
| 219 |
|
| 220 |
#ifdef IS_MPI |
| 221 |
f_Row(1,atom1) = f_Row(1,atom1) + dudx |
| 222 |
f_Row(2,atom1) = f_Row(2,atom1) + dudy |
| 223 |
f_Row(3,atom1) = f_Row(3,atom1) + dudz |
| 224 |
|
| 225 |
f_Col(1,atom2) = f_Col(1,atom2) - dudx |
| 226 |
f_Col(2,atom2) = f_Col(2,atom2) - dudy |
| 227 |
f_Col(3,atom2) = f_Col(3,atom2) - dudz |
| 228 |
#else |
| 229 |
f(1,atom1) = f(1,atom1) + dudx |
| 230 |
f(2,atom1) = f(2,atom1) + dudy |
| 231 |
f(3,atom1) = f(3,atom1) + dudz |
| 232 |
|
| 233 |
f(1,atom2) = f(1,atom2) - dudx |
| 234 |
f(2,atom2) = f(2,atom2) - dudy |
| 235 |
f(3,atom2) = f(3,atom2) - dudz |
| 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)) |
| 249 |
endif |
| 250 |
endif |
| 251 |
|
| 252 |
return |
| 253 |
end subroutine rf_correct_forces |
| 254 |
end module reaction_field |
