| 1 |
module reaction_field |
| 2 |
use force_globals |
| 3 |
use definitions |
| 4 |
use atype_module |
| 5 |
use vector_class |
| 6 |
use simulation |
| 7 |
use status |
| 8 |
#ifdef IS_MPI |
| 9 |
use mpiSimulation |
| 10 |
#endif |
| 11 |
implicit none |
| 12 |
|
| 13 |
PRIVATE |
| 14 |
|
| 15 |
real(kind=dp), save :: rrf = 1.0_dp |
| 16 |
real(kind=dp), save :: rt |
| 17 |
real(kind=dp), save :: dielect = 1.0_dp |
| 18 |
real(kind=dp), save :: rrfsq = 1.0_dp |
| 19 |
real(kind=dp), save :: pre |
| 20 |
logical, save :: haveCutoffs = .false. |
| 21 |
logical, save :: haveMomentMap = .false. |
| 22 |
logical, save :: haveDielectric = .false. |
| 23 |
|
| 24 |
type :: MomentList |
| 25 |
real(kind=DP) :: dipole_moment = 0.0_DP |
| 26 |
end type MomentList |
| 27 |
|
| 28 |
type(MomentList), dimension(:),allocatable :: MomentMap |
| 29 |
|
| 30 |
PUBLIC::initialize_rf |
| 31 |
PUBLIC::setCutoffsRF |
| 32 |
PUBLIC::accumulate_rf |
| 33 |
PUBLIC::accumulate_self_rf |
| 34 |
PUBLIC::reaction_field_final |
| 35 |
PUBLIC::rf_correct_forces |
| 36 |
|
| 37 |
contains |
| 38 |
|
| 39 |
subroutine initialize_rf(this_dielect) |
| 40 |
real(kind=dp), intent(in) :: this_dielect |
| 41 |
|
| 42 |
dielect = this_dielect |
| 43 |
|
| 44 |
pre = 14.38362d0*2.0d0*(dielect-1.0d0)/((2.0d0*dielect+1.0d0)*rrfsq*rrf) |
| 45 |
|
| 46 |
haveDielectric = .true. |
| 47 |
|
| 48 |
return |
| 49 |
end subroutine initialize_rf |
| 50 |
|
| 51 |
subroutine setCutoffsRF( this_rrf, this_rt ) |
| 52 |
|
| 53 |
real(kind=dp), intent(in) :: this_rrf, this_rt |
| 54 |
|
| 55 |
rrf = this_rrf |
| 56 |
rt = this_rt |
| 57 |
|
| 58 |
rrfsq = rrf * rrf |
| 59 |
pre = 14.38362d0*2.0d0*(dielect-1.0d0)/((2.0d0*dielect+1.0d0)*rrfsq*rrf) |
| 60 |
|
| 61 |
haveCutoffs = .true. |
| 62 |
|
| 63 |
end subroutine setCutoffsRF |
| 64 |
|
| 65 |
subroutine createMomentMap(status) |
| 66 |
integer :: nAtypes |
| 67 |
integer :: status |
| 68 |
integer :: i |
| 69 |
real (kind=DP) :: thisDP |
| 70 |
logical :: thisProperty |
| 71 |
|
| 72 |
status = 0 |
| 73 |
|
| 74 |
nAtypes = getSize(atypes) |
| 75 |
|
| 76 |
if (nAtypes == 0) then |
| 77 |
status = -1 |
| 78 |
return |
| 79 |
end if |
| 80 |
|
| 81 |
if (.not. allocated(MomentMap)) then |
| 82 |
allocate(MomentMap(nAtypes)) |
| 83 |
endif |
| 84 |
|
| 85 |
do i = 1, nAtypes |
| 86 |
|
| 87 |
call getElementProperty(atypes, i, "is_DP", thisProperty) |
| 88 |
|
| 89 |
if (thisProperty) then |
| 90 |
call getElementProperty(atypes, i, "dipole_moment", thisDP) |
| 91 |
MomentMap(i)%dipole_moment = thisDP |
| 92 |
endif |
| 93 |
|
| 94 |
end do |
| 95 |
|
| 96 |
haveMomentMap = .true. |
| 97 |
|
| 98 |
end subroutine createMomentMap |
| 99 |
|
| 100 |
subroutine accumulate_rf(atom1, atom2, rij, u_l, taper) |
| 101 |
|
| 102 |
integer, intent(in) :: atom1, atom2 |
| 103 |
real (kind = dp), intent(in) :: rij |
| 104 |
real (kind = dp), dimension(3,nLocal) :: u_l |
| 105 |
|
| 106 |
integer :: me1, me2 |
| 107 |
real (kind = dp), intent(in) :: taper |
| 108 |
real (kind = dp):: mu1, mu2 |
| 109 |
real (kind = dp), dimension(3) :: ul1 |
| 110 |
real (kind = dp), dimension(3) :: ul2 |
| 111 |
|
| 112 |
integer :: localError |
| 113 |
|
| 114 |
if ((.not.haveDielectric).or.(.not.haveCutoffs)) then |
| 115 |
write(default_error,*) 'Reaction field not initialized!' |
| 116 |
return |
| 117 |
endif |
| 118 |
|
| 119 |
if (.not.haveMomentMap) then |
| 120 |
localError = 0 |
| 121 |
call createMomentMap(localError) |
| 122 |
if ( localError .ne. 0 ) then |
| 123 |
call handleError("reaction-field", "MomentMap creation failed!") |
| 124 |
return |
| 125 |
end if |
| 126 |
endif |
| 127 |
|
| 128 |
|
| 129 |
#ifdef IS_MPI |
| 130 |
me1 = atid_Row(atom1) |
| 131 |
ul1(1) = u_l_Row(1,atom1) |
| 132 |
ul1(2) = u_l_Row(2,atom1) |
| 133 |
ul1(3) = u_l_Row(3,atom1) |
| 134 |
|
| 135 |
me2 = atid_Col(atom2) |
| 136 |
ul2(1) = u_l_Col(1,atom2) |
| 137 |
ul2(2) = u_l_Col(2,atom2) |
| 138 |
ul2(3) = u_l_Col(3,atom2) |
| 139 |
#else |
| 140 |
me1 = atid(atom1) |
| 141 |
ul1(1) = u_l(1,atom1) |
| 142 |
ul1(2) = u_l(2,atom1) |
| 143 |
ul1(3) = u_l(3,atom1) |
| 144 |
|
| 145 |
me2 = atid(atom2) |
| 146 |
ul2(1) = u_l(1,atom2) |
| 147 |
ul2(2) = u_l(2,atom2) |
| 148 |
ul2(3) = u_l(3,atom2) |
| 149 |
#endif |
| 150 |
|
| 151 |
mu1 = MomentMap(me1)%dipole_moment |
| 152 |
mu2 = MomentMap(me2)%dipole_moment |
| 153 |
|
| 154 |
#ifdef IS_MPI |
| 155 |
rf_Row(1,atom1) = rf_Row(1,atom1) + ul2(1)*mu2*taper |
| 156 |
rf_Row(2,atom1) = rf_Row(2,atom1) + ul2(2)*mu2*taper |
| 157 |
rf_Row(3,atom1) = rf_Row(3,atom1) + ul2(3)*mu2*taper |
| 158 |
|
| 159 |
rf_Col(1,atom2) = rf_Col(1,atom2) + ul1(1)*mu1*taper |
| 160 |
rf_Col(2,atom2) = rf_Col(2,atom2) + ul1(2)*mu1*taper |
| 161 |
rf_Col(3,atom2) = rf_Col(3,atom2) + ul1(3)*mu1*taper |
| 162 |
#else |
| 163 |
rf(1,atom1) = rf(1,atom1) + ul2(1)*mu2*taper |
| 164 |
rf(2,atom1) = rf(2,atom1) + ul2(2)*mu2*taper |
| 165 |
rf(3,atom1) = rf(3,atom1) + ul2(3)*mu2*taper |
| 166 |
|
| 167 |
rf(1,atom2) = rf(1,atom2) + ul1(1)*mu1*taper |
| 168 |
rf(2,atom2) = rf(2,atom2) + ul1(2)*mu1*taper |
| 169 |
rf(3,atom2) = rf(3,atom2) + ul1(3)*mu1*taper |
| 170 |
#endif |
| 171 |
|
| 172 |
|
| 173 |
return |
| 174 |
end subroutine accumulate_rf |
| 175 |
|
| 176 |
subroutine accumulate_self_rf(atom1, mu1, u_l) |
| 177 |
|
| 178 |
integer, intent(in) :: atom1 |
| 179 |
real(kind=dp), intent(in) :: mu1 |
| 180 |
real(kind=dp), dimension(3,nLocal) :: u_l |
| 181 |
|
| 182 |
!! should work for both MPI and non-MPI version since this is not pairwise. |
| 183 |
rf(1,atom1) = rf(1,atom1) + u_l(1,atom1)*mu1 |
| 184 |
rf(2,atom1) = rf(2,atom1) + u_l(2,atom1)*mu1 |
| 185 |
rf(3,atom1) = rf(3,atom1) + u_l(3,atom1)*mu1 |
| 186 |
|
| 187 |
return |
| 188 |
end subroutine accumulate_self_rf |
| 189 |
|
| 190 |
subroutine reaction_field_final(a1, mu1, u_l, rfpot, t, do_pot) |
| 191 |
|
| 192 |
integer, intent(in) :: a1 |
| 193 |
real (kind=dp), intent(in) :: mu1 |
| 194 |
real (kind=dp), intent(inout) :: rfpot |
| 195 |
logical, intent(in) :: do_pot |
| 196 |
real (kind = dp), dimension(3,nLocal) :: u_l |
| 197 |
real (kind = dp), dimension(3,nLocal) :: t |
| 198 |
|
| 199 |
integer :: localError |
| 200 |
|
| 201 |
if ((.not.haveDielectric).or.(.not.haveCutoffs)) then |
| 202 |
write(default_error,*) 'Reaction field not initialized!' |
| 203 |
return |
| 204 |
endif |
| 205 |
|
| 206 |
if (.not.haveMomentMap) then |
| 207 |
localError = 0 |
| 208 |
call createMomentMap(localError) |
| 209 |
if ( localError .ne. 0 ) then |
| 210 |
call handleError("reaction-field", "MomentMap creation failed!") |
| 211 |
return |
| 212 |
end if |
| 213 |
endif |
| 214 |
|
| 215 |
! compute torques on dipoles: |
| 216 |
! pre converts from mu in units of debye to kcal/mol |
| 217 |
|
| 218 |
! The torque contribution is dipole cross reaction_field |
| 219 |
|
| 220 |
t(1,a1) = t(1,a1) + pre*mu1*(u_l(2,a1)*rf(3,a1) - u_l(3,a1)*rf(2,a1)) |
| 221 |
t(2,a1) = t(2,a1) + pre*mu1*(u_l(3,a1)*rf(1,a1) - u_l(1,a1)*rf(3,a1)) |
| 222 |
t(3,a1) = t(3,a1) + pre*mu1*(u_l(1,a1)*rf(2,a1) - u_l(2,a1)*rf(1,a1)) |
| 223 |
|
| 224 |
! the potential contribution is -1/2 dipole dot reaction_field |
| 225 |
|
| 226 |
if (do_pot) then |
| 227 |
rfpot = rfpot - 0.5d0 * pre * mu1 * & |
| 228 |
(rf(1,a1)*u_l(1,a1) + rf(2,a1)*u_l(2,a1) + rf(3,a1)*u_l(3,a1)) |
| 229 |
endif |
| 230 |
|
| 231 |
return |
| 232 |
end subroutine reaction_field_final |
| 233 |
|
| 234 |
subroutine rf_correct_forces(atom1, atom2, d, rij, u_l, taper, f, fpair) |
| 235 |
|
| 236 |
integer, intent(in) :: atom1, atom2 |
| 237 |
real(kind=dp), dimension(3), intent(in) :: d |
| 238 |
real(kind=dp), intent(in) :: rij, taper |
| 239 |
real( kind = dp ), dimension(3,nLocal) :: u_l |
| 240 |
real( kind = dp ), dimension(3,nLocal) :: f |
| 241 |
real( kind = dp ), dimension(3), intent(inout) :: fpair |
| 242 |
|
| 243 |
real (kind = dp), dimension(3) :: ul1 |
| 244 |
real (kind = dp), dimension(3) :: ul2 |
| 245 |
real (kind = dp) :: dtdr |
| 246 |
real (kind = dp) :: dudx, dudy, dudz, u1dotu2 |
| 247 |
integer :: me1, me2, id1, id2 |
| 248 |
real (kind = dp) :: mu1, mu2 |
| 249 |
|
| 250 |
integer :: localError |
| 251 |
|
| 252 |
if ((.not.haveDielectric).or.(.not.haveCutoffs)) then |
| 253 |
write(default_error,*) 'Reaction field not initialized!' |
| 254 |
return |
| 255 |
endif |
| 256 |
|
| 257 |
if (.not.haveMomentMap) then |
| 258 |
localError = 0 |
| 259 |
call createMomentMap(localError) |
| 260 |
if ( localError .ne. 0 ) then |
| 261 |
call handleError("reaction-field", "MomentMap creation failed!") |
| 262 |
return |
| 263 |
end if |
| 264 |
endif |
| 265 |
|
| 266 |
if (rij.le.rrf) then |
| 267 |
|
| 268 |
if (rij.lt.rt) then |
| 269 |
dtdr = 0.0d0 |
| 270 |
else |
| 271 |
! write(*,*) 'rf correct in taper region' |
| 272 |
dtdr = 6.0d0*(rij*rij - rij*rt - rij*rrf +rrf*rt)/((rrf-rt)**3) |
| 273 |
endif |
| 274 |
|
| 275 |
#ifdef IS_MPI |
| 276 |
me1 = atid_Row(atom1) |
| 277 |
ul1(1) = u_l_Row(1,atom1) |
| 278 |
ul1(2) = u_l_Row(2,atom1) |
| 279 |
ul1(3) = u_l_Row(3,atom1) |
| 280 |
|
| 281 |
me2 = atid_Col(atom2) |
| 282 |
ul2(1) = u_l_Col(1,atom2) |
| 283 |
ul2(2) = u_l_Col(2,atom2) |
| 284 |
ul2(3) = u_l_Col(3,atom2) |
| 285 |
#else |
| 286 |
me1 = atid(atom1) |
| 287 |
ul1(1) = u_l(1,atom1) |
| 288 |
ul1(2) = u_l(2,atom1) |
| 289 |
ul1(3) = u_l(3,atom1) |
| 290 |
|
| 291 |
me2 = atid(atom2) |
| 292 |
ul2(1) = u_l(1,atom2) |
| 293 |
ul2(2) = u_l(2,atom2) |
| 294 |
ul2(3) = u_l(3,atom2) |
| 295 |
#endif |
| 296 |
|
| 297 |
mu1 = MomentMap(me1)%dipole_moment |
| 298 |
mu2 = MomentMap(me2)%dipole_moment |
| 299 |
|
| 300 |
u1dotu2 = ul1(1)*ul2(1) + ul1(2)*ul2(2) + ul1(3)*ul2(3) |
| 301 |
|
| 302 |
dudx = - pre*mu1*mu2*u1dotu2*dtdr*d(1)/rij |
| 303 |
dudy = - pre*mu1*mu2*u1dotu2*dtdr*d(2)/rij |
| 304 |
dudz = - pre*mu1*mu2*u1dotu2*dtdr*d(3)/rij |
| 305 |
|
| 306 |
#ifdef IS_MPI |
| 307 |
f_Row(1,atom1) = f_Row(1,atom1) + dudx |
| 308 |
f_Row(2,atom1) = f_Row(2,atom1) + dudy |
| 309 |
f_Row(3,atom1) = f_Row(3,atom1) + dudz |
| 310 |
|
| 311 |
f_Col(1,atom2) = f_Col(1,atom2) - dudx |
| 312 |
f_Col(2,atom2) = f_Col(2,atom2) - dudy |
| 313 |
f_Col(3,atom2) = f_Col(3,atom2) - dudz |
| 314 |
#else |
| 315 |
f(1,atom1) = f(1,atom1) + dudx |
| 316 |
f(2,atom1) = f(2,atom1) + dudy |
| 317 |
f(3,atom1) = f(3,atom1) + dudz |
| 318 |
|
| 319 |
f(1,atom2) = f(1,atom2) - dudx |
| 320 |
f(2,atom2) = f(2,atom2) - dudy |
| 321 |
f(3,atom2) = f(3,atom2) - dudz |
| 322 |
#endif |
| 323 |
|
| 324 |
#ifdef IS_MPI |
| 325 |
id1 = AtomRowToGlobal(atom1) |
| 326 |
id2 = AtomColToGlobal(atom2) |
| 327 |
#else |
| 328 |
id1 = atom1 |
| 329 |
id2 = atom2 |
| 330 |
#endif |
| 331 |
|
| 332 |
if (molMembershipList(id1) .ne. molMembershipList(id2)) then |
| 333 |
|
| 334 |
fpair(1) = fpair(1) + dudx |
| 335 |
fpair(2) = fpair(2) + dudy |
| 336 |
fpair(3) = fpair(3) + dudz |
| 337 |
|
| 338 |
endif |
| 339 |
|
| 340 |
end if |
| 341 |
return |
| 342 |
end subroutine rf_correct_forces |
| 343 |
end module reaction_field |
