| 1 |
mmeineke |
270 |
!! Calculates Long Range forces Lennard-Jones interactions. |
| 2 |
|
|
!! Corresponds to the force field defined in lj_FF.cpp |
| 3 |
|
|
!! @author Charles F. Vardeman II |
| 4 |
|
|
!! @author Matthew Meineke |
| 5 |
chuckv |
288 |
!! @version $Id: lj_FF.F90,v 1.3 2003-02-27 18:42:52 chuckv Exp $, $Date: 2003-02-27 18:42:52 $, $Name: not supported by cvs2svn $, $Revision: 1.3 $ |
| 6 |
mmeineke |
270 |
|
| 7 |
|
|
|
| 8 |
|
|
|
| 9 |
|
|
module lj_ff |
| 10 |
|
|
use simulation |
| 11 |
|
|
use definitions |
| 12 |
|
|
use generic_atypes |
| 13 |
chuckv |
288 |
use neighborLists |
| 14 |
mmeineke |
270 |
#ifdef IS_MPI |
| 15 |
|
|
use mpiSimulation |
| 16 |
|
|
#endif |
| 17 |
|
|
implicit none |
| 18 |
|
|
PRIVATE |
| 19 |
|
|
|
| 20 |
|
|
!! Number of lj_atypes in lj_atype_list |
| 21 |
|
|
integer, save :: n_lj_atypes = 0 |
| 22 |
|
|
|
| 23 |
|
|
!! Global list of lj atypes in simulation |
| 24 |
|
|
type (lj_atype), pointer :: ljListHead => null() |
| 25 |
|
|
type (lj_atype), pointer :: ljListTail => null() |
| 26 |
|
|
|
| 27 |
|
|
|
| 28 |
|
|
!! LJ mixing array |
| 29 |
|
|
type (lj_atype), dimension(:,:), pointer :: ljMixed => null() |
| 30 |
|
|
|
| 31 |
|
|
|
| 32 |
|
|
logical, save :: firstTime = .True. |
| 33 |
|
|
|
| 34 |
|
|
!! Atype identity pointer lists |
| 35 |
|
|
#ifdef IS_MPI |
| 36 |
|
|
!! Row lj_atype pointer list |
| 37 |
|
|
type (lj_identPtrList), dimension(:), pointer :: identPtrListRow => null() |
| 38 |
|
|
!! Column lj_atype pointer list |
| 39 |
|
|
type (lj_identPtrList), dimension(:), pointer :: identPtrListColumn => null() |
| 40 |
|
|
#else |
| 41 |
|
|
type( lj_identPtrList ), dimension(:), pointer :: identPtrList => null() |
| 42 |
|
|
#endif |
| 43 |
|
|
|
| 44 |
|
|
|
| 45 |
|
|
!! Logical has lj force field module been initialized? |
| 46 |
|
|
logical, save :: isljFFinit = .false. |
| 47 |
|
|
|
| 48 |
|
|
|
| 49 |
|
|
!! Public methods and data |
| 50 |
|
|
public :: new_lj_atype |
| 51 |
|
|
public :: do_lj_ff |
| 52 |
|
|
public :: getLjPot |
| 53 |
|
|
public :: init_ljFF |
| 54 |
|
|
|
| 55 |
|
|
|
| 56 |
|
|
|
| 57 |
|
|
|
| 58 |
|
|
contains |
| 59 |
|
|
|
| 60 |
|
|
!! Adds a new lj_atype to the list. |
| 61 |
|
|
subroutine new_lj_atype(ident,mass,epsilon,sigma,status) |
| 62 |
|
|
real( kind = dp ), intent(in) :: mass |
| 63 |
|
|
real( kind = dp ), intent(in) :: epsilon |
| 64 |
|
|
real( kind = dp ), intent(in) :: sigma |
| 65 |
|
|
integer, intent(in) :: ident |
| 66 |
|
|
integer, intent(out) :: status |
| 67 |
|
|
|
| 68 |
|
|
type (lj_atype), pointer :: newLJ_atype |
| 69 |
|
|
integer :: alloc_error |
| 70 |
|
|
integer :: atype_counter = 0 |
| 71 |
|
|
integer :: alloc_size |
| 72 |
|
|
integer :: err_stat |
| 73 |
|
|
status = 0 |
| 74 |
|
|
|
| 75 |
|
|
|
| 76 |
|
|
|
| 77 |
|
|
! allocate a new atype |
| 78 |
|
|
allocate(newLJ_atype,stat=alloc_error) |
| 79 |
|
|
if (alloc_error /= 0 ) then |
| 80 |
|
|
status = -1 |
| 81 |
|
|
return |
| 82 |
|
|
end if |
| 83 |
|
|
|
| 84 |
|
|
! assign our new lj_atype information |
| 85 |
|
|
newLJ_atype%mass = mass |
| 86 |
|
|
newLJ_atype%epsilon = epsilon |
| 87 |
|
|
newLJ_atype%sigma = sigma |
| 88 |
|
|
newLJ_atype%sigma2 = sigma * sigma |
| 89 |
|
|
newLJ_atype%sigma6 = newLJ_atype%sigma2 * newLJ_atype%sigma2 & |
| 90 |
|
|
* newLJ_atype%sigma2 |
| 91 |
|
|
! assume that this atype will be successfully added |
| 92 |
|
|
newLJ_atype%atype_ident = ident |
| 93 |
|
|
newLJ_atype%atype_number = n_lj_atypes + 1 |
| 94 |
|
|
|
| 95 |
|
|
call add_atype(newLJ_atype,ljListHead,ljListTail,err_stat) |
| 96 |
|
|
if (err_stat /= 0 ) then |
| 97 |
|
|
status = -1 |
| 98 |
|
|
return |
| 99 |
|
|
endif |
| 100 |
|
|
|
| 101 |
|
|
n_lj_atypes = n_lj_atypes + 1 |
| 102 |
|
|
|
| 103 |
|
|
|
| 104 |
|
|
end subroutine new_lj_atype |
| 105 |
|
|
|
| 106 |
|
|
|
| 107 |
|
|
subroutine init_ljFF(nComponents,ident, status) |
| 108 |
|
|
!! Number of components in ident array |
| 109 |
|
|
integer, intent(inout) :: nComponents |
| 110 |
|
|
!! Array of identities nComponents long corresponding to |
| 111 |
|
|
!! ljatype ident. |
| 112 |
|
|
integer, dimension(nComponents),intent(inout) :: ident |
| 113 |
|
|
!! Result status, success = 0, error = -1 |
| 114 |
|
|
integer, intent(out) :: Status |
| 115 |
|
|
|
| 116 |
|
|
integer :: alloc_stat |
| 117 |
|
|
|
| 118 |
|
|
integer :: thisStat |
| 119 |
|
|
integer :: i |
| 120 |
|
|
|
| 121 |
|
|
integer :: myNode |
| 122 |
|
|
#ifdef IS_MPI |
| 123 |
|
|
integer, allocatable, dimension(:) :: identRow |
| 124 |
|
|
integer, allocatable, dimension(:) :: identCol |
| 125 |
|
|
integer :: nrow |
| 126 |
|
|
integer :: ncol |
| 127 |
|
|
#endif |
| 128 |
|
|
status = 0 |
| 129 |
|
|
|
| 130 |
|
|
|
| 131 |
|
|
|
| 132 |
|
|
|
| 133 |
|
|
!! if were're not in MPI, we just update ljatypePtrList |
| 134 |
|
|
#ifndef IS_MPI |
| 135 |
|
|
call create_IdentPtrlst(ident,ljListHead,identPtrList,thisStat) |
| 136 |
|
|
if ( thisStat /= 0 ) then |
| 137 |
|
|
status = -1 |
| 138 |
|
|
return |
| 139 |
|
|
endif |
| 140 |
|
|
|
| 141 |
|
|
!! Allocate pointer lists |
| 142 |
|
|
allocate(point(nComponents),stat=alloc_stat) |
| 143 |
|
|
if (alloc_stat /=0) then |
| 144 |
|
|
status = -1 |
| 145 |
|
|
return |
| 146 |
|
|
endif |
| 147 |
|
|
|
| 148 |
|
|
allocate(list(nComponents*listMultiplier),stat=alloc_stat) |
| 149 |
|
|
if (alloc_stat /=0) then |
| 150 |
|
|
status = -1 |
| 151 |
|
|
return |
| 152 |
|
|
endif |
| 153 |
|
|
|
| 154 |
|
|
! if were're in MPI, we also have to worry about row and col lists |
| 155 |
|
|
#else |
| 156 |
|
|
|
| 157 |
|
|
! We can only set up forces if mpiSimulation has been setup. |
| 158 |
|
|
if (.not. isMPISimSet()) then |
| 159 |
|
|
write(default_error,*) "MPI is not set" |
| 160 |
|
|
status = -1 |
| 161 |
|
|
return |
| 162 |
|
|
endif |
| 163 |
|
|
nrow = getNrow(plan_row) |
| 164 |
|
|
ncol = getNcol(plan_col) |
| 165 |
|
|
mynode = getMyNode() |
| 166 |
|
|
!! Allocate temperary arrays to hold gather information |
| 167 |
|
|
allocate(identRow(nrow),stat=alloc_stat) |
| 168 |
|
|
if (alloc_stat /= 0 ) then |
| 169 |
|
|
status = -1 |
| 170 |
|
|
return |
| 171 |
|
|
endif |
| 172 |
|
|
|
| 173 |
|
|
allocate(identCol(ncol),stat=alloc_stat) |
| 174 |
|
|
if (alloc_stat /= 0 ) then |
| 175 |
|
|
status = -1 |
| 176 |
|
|
return |
| 177 |
|
|
endif |
| 178 |
|
|
|
| 179 |
|
|
!! Gather idents into row and column idents |
| 180 |
|
|
|
| 181 |
|
|
call gather(ident,identRow,plan_row) |
| 182 |
|
|
call gather(ident,identCol,plan_col) |
| 183 |
|
|
|
| 184 |
|
|
|
| 185 |
|
|
!! Create row and col pointer lists |
| 186 |
|
|
|
| 187 |
|
|
call create_IdentPtrlst(identRow,ljListHead,identPtrListRow,thisStat) |
| 188 |
|
|
if (thisStat /= 0 ) then |
| 189 |
|
|
status = -1 |
| 190 |
|
|
return |
| 191 |
|
|
endif |
| 192 |
|
|
|
| 193 |
|
|
call create_IdentPtrlst(identCol,ljListHead,identPtrListColumn,thisStat) |
| 194 |
|
|
if (thisStat /= 0 ) then |
| 195 |
|
|
status = -1 |
| 196 |
|
|
return |
| 197 |
|
|
endif |
| 198 |
|
|
|
| 199 |
|
|
!! free temporary ident arrays |
| 200 |
|
|
if (allocated(identCol)) then |
| 201 |
|
|
deallocate(identCol) |
| 202 |
|
|
end if |
| 203 |
|
|
if (allocated(identCol)) then |
| 204 |
|
|
deallocate(identRow) |
| 205 |
|
|
endif |
| 206 |
|
|
|
| 207 |
|
|
#endif |
| 208 |
|
|
|
| 209 |
|
|
call createMixingList(thisStat) |
| 210 |
|
|
if (thisStat /= 0) then |
| 211 |
|
|
status = -1 |
| 212 |
|
|
return |
| 213 |
|
|
endif |
| 214 |
chuckv |
288 |
!! Create neighbor lists |
| 215 |
|
|
call expandList(thisStat) |
| 216 |
|
|
if (thisStat /= 0) then |
| 217 |
|
|
status = -1 |
| 218 |
|
|
return |
| 219 |
|
|
endif |
| 220 |
|
|
|
| 221 |
mmeineke |
270 |
isljFFinit = .true. |
| 222 |
|
|
|
| 223 |
|
|
|
| 224 |
|
|
end subroutine init_ljFF |
| 225 |
|
|
|
| 226 |
|
|
|
| 227 |
|
|
|
| 228 |
|
|
|
| 229 |
|
|
|
| 230 |
|
|
|
| 231 |
|
|
subroutine createMixingList(status) |
| 232 |
|
|
integer :: listSize |
| 233 |
|
|
integer :: status |
| 234 |
|
|
integer :: i |
| 235 |
|
|
integer :: j |
| 236 |
|
|
|
| 237 |
|
|
integer :: outerCounter = 0 |
| 238 |
|
|
integer :: innerCounter = 0 |
| 239 |
|
|
type (lj_atype), pointer :: tmpPtrOuter => null() |
| 240 |
|
|
type (lj_atype), pointer :: tmpPtrInner => null() |
| 241 |
|
|
status = 0 |
| 242 |
|
|
|
| 243 |
|
|
listSize = getListLen(ljListHead) |
| 244 |
|
|
if (listSize == 0) then |
| 245 |
|
|
status = -1 |
| 246 |
|
|
return |
| 247 |
|
|
end if |
| 248 |
|
|
|
| 249 |
|
|
|
| 250 |
|
|
if (.not. associated(ljMixed)) then |
| 251 |
|
|
allocate(ljMixed(listSize,listSize)) |
| 252 |
|
|
else |
| 253 |
|
|
status = -1 |
| 254 |
|
|
return |
| 255 |
|
|
end if |
| 256 |
|
|
|
| 257 |
|
|
|
| 258 |
|
|
|
| 259 |
|
|
tmpPtrOuter => ljListHead |
| 260 |
|
|
tmpPtrInner => tmpPtrOuter%next |
| 261 |
|
|
do while (associated(tmpPtrOuter)) |
| 262 |
|
|
outerCounter = outerCounter + 1 |
| 263 |
|
|
! do self mixing rule |
| 264 |
|
|
ljMixed(outerCounter,outerCounter)%sigma = tmpPtrOuter%sigma |
| 265 |
|
|
|
| 266 |
|
|
ljMixed(outerCounter,outerCounter)%sigma2 = ljMixed(outerCounter,outerCounter)%sigma & |
| 267 |
|
|
* ljMixed(outerCounter,outerCounter)%sigma |
| 268 |
|
|
|
| 269 |
|
|
ljMixed(outerCounter,outerCounter)%sigma6 = ljMixed(outerCounter,outerCounter)%sigma2 & |
| 270 |
|
|
* ljMixed(outerCounter,outerCounter)%sigma2 & |
| 271 |
|
|
* ljMixed(outerCounter,outerCounter)%sigma2 |
| 272 |
|
|
|
| 273 |
|
|
ljMixed(outerCounter,outerCounter)%epsilon = tmpPtrOuter%epsilon |
| 274 |
|
|
|
| 275 |
|
|
innerCounter = outerCounter + 1 |
| 276 |
|
|
do while (associated(tmpPtrInner)) |
| 277 |
|
|
|
| 278 |
|
|
ljMixed(outerCounter,innerCounter)%sigma = & |
| 279 |
|
|
calcLJMix("sigma",tmpPtrOuter%sigma, & |
| 280 |
|
|
tmpPtrInner%sigma) |
| 281 |
|
|
|
| 282 |
|
|
ljMixed(outerCounter,innerCounter)%sigma2 = & |
| 283 |
|
|
ljMixed(outerCounter,innerCounter)%sigma & |
| 284 |
|
|
* ljMixed(outerCounter,innerCounter)%sigma |
| 285 |
|
|
|
| 286 |
|
|
ljMixed(outerCounter,innerCounter)%sigma6 = & |
| 287 |
|
|
ljMixed(outerCounter,innerCounter)%sigma2 & |
| 288 |
|
|
* ljMixed(outerCounter,innerCounter)%sigma2 & |
| 289 |
|
|
* ljMixed(outerCounter,innerCounter)%sigma2 |
| 290 |
|
|
|
| 291 |
|
|
ljMixed(outerCounter,innerCounter)%epsilon = & |
| 292 |
|
|
calcLJMix("epsilon",tmpPtrOuter%epsilon, & |
| 293 |
|
|
tmpPtrInner%epsilon) |
| 294 |
|
|
ljMixed(innerCounter,outerCounter)%sigma = ljMixed(outerCounter,innerCounter)%sigma |
| 295 |
|
|
ljMixed(innerCounter,outerCounter)%sigma2 = ljMixed(outerCounter,innerCounter)%sigma2 |
| 296 |
|
|
ljMixed(innerCounter,outerCounter)%sigma6 = ljMixed(outerCounter,innerCounter)%sigma6 |
| 297 |
|
|
ljMixed(innerCounter,outerCounter)%epsilon = ljMixed(outerCounter,innerCounter)%epsilon |
| 298 |
|
|
|
| 299 |
|
|
|
| 300 |
|
|
tmpPtrInner => tmpPtrInner%next |
| 301 |
|
|
innerCounter = innerCounter + 1 |
| 302 |
|
|
end do |
| 303 |
|
|
! advance pointers |
| 304 |
|
|
tmpPtrOuter => tmpPtrOuter%next |
| 305 |
|
|
if (associated(tmpPtrOuter)) then |
| 306 |
|
|
tmpPtrInner => tmpPtrOuter%next |
| 307 |
|
|
endif |
| 308 |
|
|
|
| 309 |
|
|
end do |
| 310 |
|
|
|
| 311 |
|
|
end subroutine createMixingList |
| 312 |
|
|
|
| 313 |
|
|
|
| 314 |
|
|
|
| 315 |
|
|
|
| 316 |
|
|
|
| 317 |
|
|
|
| 318 |
|
|
|
| 319 |
|
|
|
| 320 |
|
|
!! FORCE routine Calculates Lennard Jones forces. |
| 321 |
|
|
!-------------------------------------------------------------> |
| 322 |
chuckv |
288 |
subroutine do_lj_ff(q,f,potE,tau,do_pot,FFerror) |
| 323 |
mmeineke |
270 |
!! Position array provided by C, dimensioned by getNlocal |
| 324 |
|
|
real ( kind = dp ), dimension(3,getNlocal()) :: q |
| 325 |
|
|
!! Force array provided by C, dimensioned by getNlocal |
| 326 |
|
|
real ( kind = dp ), dimension(3,getNlocal()) :: f |
| 327 |
mmeineke |
285 |
!! Stress Tensor |
| 328 |
|
|
real( kind = dp), dimension(9) :: tau |
| 329 |
|
|
real( kind = dp), dimension(9) :: tauTemp |
| 330 |
mmeineke |
270 |
real ( kind = dp ) :: potE |
| 331 |
|
|
logical ( kind = 2) :: do_pot |
| 332 |
chuckv |
288 |
integer :: FFerror |
| 333 |
|
|
|
| 334 |
mmeineke |
270 |
|
| 335 |
|
|
type(lj_atype), pointer :: ljAtype_i |
| 336 |
|
|
type(lj_atype), pointer :: ljAtype_j |
| 337 |
|
|
|
| 338 |
mmeineke |
285 |
|
| 339 |
|
|
|
| 340 |
|
|
|
| 341 |
|
|
|
| 342 |
|
|
|
| 343 |
mmeineke |
270 |
#ifdef IS_MPI |
| 344 |
|
|
real( kind = DP ) :: pot_local |
| 345 |
mmeineke |
285 |
|
| 346 |
mmeineke |
270 |
!! Local arrays needed for MPI |
| 347 |
mmeineke |
285 |
real(kind = dp), dimension(3,getNrow(plan_row)) :: qRow = 0.0_dp |
| 348 |
|
|
real(kind = dp), dimension(3,getNcol(plan_col)) :: qCol = 0.0_dp |
| 349 |
mmeineke |
270 |
|
| 350 |
mmeineke |
285 |
real(kind = dp), dimension(3,getNrow(plan_row)) :: fRow = 0.0_dp |
| 351 |
|
|
real(kind = dp), dimension(3,getNcol(plan_col)) :: fCol = 0.0_dp |
| 352 |
|
|
real(kind = dp), dimension(3,getNlocal()) :: fMPITemp = 0.0_dp |
| 353 |
mmeineke |
270 |
|
| 354 |
mmeineke |
285 |
real(kind = dp), dimension(getNrow(plan_row)) :: eRow = 0.0_dp |
| 355 |
|
|
real(kind = dp), dimension(getNcol(plan_col)) :: eCol = 0.0_dp |
| 356 |
mmeineke |
270 |
|
| 357 |
mmeineke |
285 |
real(kind = dp), dimension(getNlocal()) :: eTemp = 0.0_dp |
| 358 |
mmeineke |
270 |
|
| 359 |
mmeineke |
285 |
#endif |
| 360 |
mmeineke |
270 |
|
| 361 |
|
|
|
| 362 |
mmeineke |
285 |
|
| 363 |
mmeineke |
270 |
real( kind = DP ) :: pe |
| 364 |
|
|
logical :: update_nlist |
| 365 |
|
|
|
| 366 |
|
|
|
| 367 |
|
|
integer :: i, j, jbeg, jend, jnab, idim, jdim, idim2, jdim2, dim, dim2 |
| 368 |
|
|
integer :: nlist |
| 369 |
|
|
integer :: j_start |
| 370 |
|
|
integer :: tag_i,tag_j |
| 371 |
|
|
real( kind = DP ) :: r, pot, ftmp, dudr, d2, drdx1, kt1, kt2, kt3, ktmp |
| 372 |
mmeineke |
285 |
real( kind = dp ) :: fx,fy,fz |
| 373 |
|
|
real( kind = DP ) :: drdx, drdy, drdz |
| 374 |
mmeineke |
270 |
real( kind = DP ) :: rxi, ryi, rzi, rxij, ryij, rzij, rijsq |
| 375 |
|
|
real( kind = DP ) :: rlistsq, rcutsq,rlist,rcut |
| 376 |
|
|
|
| 377 |
|
|
! a rig that need to be fixed. |
| 378 |
|
|
#ifdef IS_MPI |
| 379 |
|
|
logical :: newtons_thrd = .true. |
| 380 |
|
|
real( kind = dp ) :: pe_local |
| 381 |
|
|
integer :: nlocal |
| 382 |
|
|
#endif |
| 383 |
|
|
integer :: nrow |
| 384 |
|
|
integer :: ncol |
| 385 |
|
|
integer :: natoms |
| 386 |
chuckv |
288 |
integer :: neighborListSize |
| 387 |
|
|
integer :: listerror |
| 388 |
mmeineke |
285 |
!! should we calculate the stress tensor |
| 389 |
|
|
logical :: do_stress = .false. |
| 390 |
mmeineke |
270 |
|
| 391 |
|
|
|
| 392 |
chuckv |
288 |
FFerror = 0 |
| 393 |
mmeineke |
270 |
! Make sure we are properly initialized. |
| 394 |
|
|
if (.not. isljFFInit) then |
| 395 |
|
|
write(default_error,*) "ERROR: lj_FF has not been properly initialized" |
| 396 |
chuckv |
288 |
FFerror = -1 |
| 397 |
mmeineke |
270 |
return |
| 398 |
|
|
endif |
| 399 |
|
|
#ifdef IS_MPI |
| 400 |
|
|
if (.not. isMPISimSet()) then |
| 401 |
|
|
write(default_error,*) "ERROR: mpiSimulation has not been properly initialized" |
| 402 |
chuckv |
288 |
FFerror = -1 |
| 403 |
mmeineke |
270 |
return |
| 404 |
|
|
endif |
| 405 |
|
|
#endif |
| 406 |
|
|
|
| 407 |
|
|
!! initialize local variables |
| 408 |
|
|
natoms = getNlocal() |
| 409 |
|
|
call getRcut(rcut,rcut2=rcutsq) |
| 410 |
|
|
call getRlist(rlist,rlistsq) |
| 411 |
mmeineke |
285 |
!! Find ensemble |
| 412 |
|
|
if (isEnsemble("NPT")) do_stress = .true. |
| 413 |
mmeineke |
270 |
|
| 414 |
|
|
#ifndef IS_MPI |
| 415 |
|
|
nrow = natoms - 1 |
| 416 |
|
|
ncol = natoms |
| 417 |
|
|
#else |
| 418 |
|
|
nrow = getNrow(plan_row) |
| 419 |
|
|
ncol = getNcol(plan_col) |
| 420 |
|
|
nlocal = natoms |
| 421 |
|
|
j_start = 1 |
| 422 |
|
|
#endif |
| 423 |
|
|
|
| 424 |
|
|
|
| 425 |
|
|
!! See if we need to update neighbor lists |
| 426 |
|
|
call check(q,update_nlist) |
| 427 |
chuckv |
288 |
! if (firstTime) then |
| 428 |
|
|
! update_nlist = .true. |
| 429 |
|
|
! firstTime = .false. |
| 430 |
|
|
! endif |
| 431 |
mmeineke |
270 |
|
| 432 |
|
|
!--------------WARNING........................... |
| 433 |
|
|
! Zero variables, NOTE:::: Forces are zeroed in C |
| 434 |
|
|
! Zeroing them here could delete previously computed |
| 435 |
|
|
! Forces. |
| 436 |
|
|
!------------------------------------------------ |
| 437 |
|
|
#ifndef IS_MPI |
| 438 |
|
|
! nloops = nloops + 1 |
| 439 |
|
|
pe = 0.0E0_DP |
| 440 |
|
|
|
| 441 |
|
|
#else |
| 442 |
|
|
fRow = 0.0E0_DP |
| 443 |
|
|
fCol = 0.0E0_DP |
| 444 |
|
|
|
| 445 |
|
|
pe_local = 0.0E0_DP |
| 446 |
|
|
|
| 447 |
|
|
eRow = 0.0E0_DP |
| 448 |
|
|
eCol = 0.0E0_DP |
| 449 |
|
|
eTemp = 0.0E0_DP |
| 450 |
|
|
#endif |
| 451 |
|
|
|
| 452 |
|
|
! communicate MPI positions |
| 453 |
|
|
#ifdef IS_MPI |
| 454 |
|
|
call gather(q,qRow,plan_row3d) |
| 455 |
|
|
call gather(q,qCol,plan_col3d) |
| 456 |
|
|
#endif |
| 457 |
|
|
|
| 458 |
|
|
|
| 459 |
|
|
if (update_nlist) then |
| 460 |
|
|
|
| 461 |
|
|
! save current configuration, contruct neighbor list, |
| 462 |
|
|
! and calculate forces |
| 463 |
chuckv |
288 |
call save_neighborList(q) |
| 464 |
mmeineke |
270 |
|
| 465 |
chuckv |
288 |
neighborListSize = getNeighborListSize() |
| 466 |
mmeineke |
270 |
nlist = 0 |
| 467 |
|
|
|
| 468 |
|
|
|
| 469 |
|
|
|
| 470 |
|
|
do i = 1, nrow |
| 471 |
|
|
point(i) = nlist + 1 |
| 472 |
|
|
#ifdef IS_MPI |
| 473 |
|
|
ljAtype_i => identPtrListRow(i)%this |
| 474 |
|
|
tag_i = tagRow(i) |
| 475 |
|
|
rxi = qRow(1,i) |
| 476 |
|
|
ryi = qRow(2,i) |
| 477 |
|
|
rzi = qRow(3,i) |
| 478 |
|
|
#else |
| 479 |
|
|
ljAtype_i => identPtrList(i)%this |
| 480 |
|
|
j_start = i + 1 |
| 481 |
|
|
rxi = q(1,i) |
| 482 |
|
|
ryi = q(2,i) |
| 483 |
|
|
rzi = q(3,i) |
| 484 |
|
|
#endif |
| 485 |
|
|
|
| 486 |
|
|
inner: do j = j_start, ncol |
| 487 |
|
|
#ifdef IS_MPI |
| 488 |
|
|
! Assign identity pointers and tags |
| 489 |
|
|
ljAtype_j => identPtrListColumn(j)%this |
| 490 |
|
|
tag_j = tagColumn(j) |
| 491 |
|
|
if (newtons_thrd) then |
| 492 |
|
|
if (tag_i <= tag_j) then |
| 493 |
|
|
if (mod(tag_i + tag_j,2) == 0) cycle inner |
| 494 |
|
|
else |
| 495 |
|
|
if (mod(tag_i + tag_j,2) == 1) cycle inner |
| 496 |
|
|
endif |
| 497 |
|
|
endif |
| 498 |
|
|
|
| 499 |
|
|
rxij = wrap(rxi - qCol(1,j), 1) |
| 500 |
|
|
ryij = wrap(ryi - qCol(2,j), 2) |
| 501 |
|
|
rzij = wrap(rzi - qCol(3,j), 3) |
| 502 |
|
|
#else |
| 503 |
|
|
ljAtype_j => identPtrList(j)%this |
| 504 |
|
|
rxij = wrap(rxi - q(1,j), 1) |
| 505 |
|
|
ryij = wrap(ryi - q(2,j), 2) |
| 506 |
|
|
rzij = wrap(rzi - q(3,j), 3) |
| 507 |
|
|
|
| 508 |
|
|
#endif |
| 509 |
|
|
rijsq = rxij*rxij + ryij*ryij + rzij*rzij |
| 510 |
|
|
|
| 511 |
|
|
#ifdef IS_MPI |
| 512 |
|
|
if (rijsq <= rlistsq .AND. & |
| 513 |
|
|
tag_j /= tag_i) then |
| 514 |
|
|
#else |
| 515 |
|
|
|
| 516 |
|
|
if (rijsq < rlistsq) then |
| 517 |
|
|
#endif |
| 518 |
|
|
|
| 519 |
|
|
nlist = nlist + 1 |
| 520 |
chuckv |
288 |
if (nlist > neighborListSize) then |
| 521 |
|
|
call expandList(listerror) |
| 522 |
|
|
if (listerror /= 0) then |
| 523 |
|
|
FFerror = -1 |
| 524 |
|
|
write(DEFAULT_ERROR,*) "ERROR: nlist > list size and max allocations exceeded." |
| 525 |
|
|
return |
| 526 |
|
|
end if |
| 527 |
mmeineke |
270 |
endif |
| 528 |
|
|
list(nlist) = j |
| 529 |
|
|
|
| 530 |
|
|
|
| 531 |
|
|
if (rijsq < rcutsq) then |
| 532 |
|
|
|
| 533 |
|
|
r = dsqrt(rijsq) |
| 534 |
|
|
|
| 535 |
|
|
call getLJPot(r,pot,dudr,ljAtype_i,ljAtype_j) |
| 536 |
|
|
|
| 537 |
|
|
#ifdef IS_MPI |
| 538 |
|
|
eRow(i) = eRow(i) + pot*0.5 |
| 539 |
|
|
eCol(i) = eCol(i) + pot*0.5 |
| 540 |
|
|
#else |
| 541 |
|
|
pe = pe + pot |
| 542 |
|
|
#endif |
| 543 |
|
|
|
| 544 |
mmeineke |
285 |
drdx = -rxij / r |
| 545 |
|
|
drdy = -ryij / r |
| 546 |
|
|
drdz = -rzij / r |
| 547 |
|
|
|
| 548 |
|
|
fx = dudr * drdx |
| 549 |
|
|
fy = dudr * drdy |
| 550 |
|
|
fz = dudr * drdz |
| 551 |
|
|
|
| 552 |
mmeineke |
270 |
#ifdef IS_MPI |
| 553 |
mmeineke |
285 |
fCol(1,j) = fCol(1,j) - fx |
| 554 |
|
|
fCol(2,j) = fCol(2,j) - fy |
| 555 |
|
|
fCol(3,j) = fCol(3,j) - fz |
| 556 |
|
|
|
| 557 |
|
|
fRow(1,j) = fRow(1,j) + fx |
| 558 |
|
|
fRow(2,j) = fRow(2,j) + fy |
| 559 |
|
|
fRow(3,j) = fRow(3,j) + fz |
| 560 |
|
|
#else |
| 561 |
|
|
f(1,j) = f(1,j) - fx |
| 562 |
|
|
f(2,j) = f(2,j) - fy |
| 563 |
|
|
f(3,j) = f(3,j) - fz |
| 564 |
|
|
f(1,i) = f(1,i) + fx |
| 565 |
|
|
f(2,i) = f(2,i) + fy |
| 566 |
|
|
f(3,i) = f(3,i) + fz |
| 567 |
|
|
#endif |
| 568 |
|
|
|
| 569 |
|
|
if (do_stress) then |
| 570 |
|
|
tauTemp(1) = tauTemp(1) + fx * rxij |
| 571 |
|
|
tauTemp(2) = tauTemp(2) + fx * ryij |
| 572 |
|
|
tauTemp(3) = tauTemp(3) + fx * rzij |
| 573 |
|
|
tauTemp(4) = tauTemp(4) + fy * rxij |
| 574 |
|
|
tauTemp(5) = tauTemp(5) + fy * ryij |
| 575 |
|
|
tauTemp(6) = tauTemp(6) + fy * rzij |
| 576 |
|
|
tauTemp(7) = tauTemp(7) + fz * rxij |
| 577 |
|
|
tauTemp(8) = tauTemp(8) + fz * ryij |
| 578 |
|
|
tauTemp(9) = tauTemp(9) + fz * rzij |
| 579 |
|
|
endif |
| 580 |
|
|
endif |
| 581 |
|
|
enddo inner |
| 582 |
mmeineke |
270 |
enddo |
| 583 |
|
|
|
| 584 |
|
|
#ifdef IS_MPI |
| 585 |
|
|
point(nrow + 1) = nlist + 1 |
| 586 |
|
|
#else |
| 587 |
|
|
point(natoms) = nlist + 1 |
| 588 |
|
|
#endif |
| 589 |
|
|
|
| 590 |
|
|
else |
| 591 |
|
|
|
| 592 |
|
|
! use the list to find the neighbors |
| 593 |
|
|
do i = 1, nrow |
| 594 |
|
|
JBEG = POINT(i) |
| 595 |
|
|
JEND = POINT(i+1) - 1 |
| 596 |
|
|
! check thiat molecule i has neighbors |
| 597 |
|
|
if (jbeg .le. jend) then |
| 598 |
|
|
#ifdef IS_MPI |
| 599 |
|
|
ljAtype_i => identPtrListRow(i)%this |
| 600 |
|
|
rxi = qRow(1,i) |
| 601 |
|
|
ryi = qRow(2,i) |
| 602 |
|
|
rzi = qRow(3,i) |
| 603 |
|
|
#else |
| 604 |
|
|
ljAtype_i => identPtrList(i)%this |
| 605 |
|
|
rxi = q(1,i) |
| 606 |
|
|
ryi = q(2,i) |
| 607 |
|
|
rzi = q(3,i) |
| 608 |
|
|
#endif |
| 609 |
|
|
do jnab = jbeg, jend |
| 610 |
|
|
j = list(jnab) |
| 611 |
|
|
#ifdef IS_MPI |
| 612 |
|
|
ljAtype_j = identPtrListColumn(j)%this |
| 613 |
|
|
rxij = wrap(rxi - qCol(1,j), 1) |
| 614 |
|
|
ryij = wrap(ryi - qCol(2,j), 2) |
| 615 |
|
|
rzij = wrap(rzi - qCol(3,j), 3) |
| 616 |
|
|
#else |
| 617 |
|
|
ljAtype_j = identPtrList(j)%this |
| 618 |
|
|
rxij = wrap(rxi - q(1,j), 1) |
| 619 |
|
|
ryij = wrap(ryi - q(2,j), 2) |
| 620 |
|
|
rzij = wrap(rzi - q(3,j), 3) |
| 621 |
|
|
#endif |
| 622 |
|
|
rijsq = rxij*rxij + ryij*ryij + rzij*rzij |
| 623 |
|
|
|
| 624 |
|
|
if (rijsq < rcutsq) then |
| 625 |
|
|
|
| 626 |
|
|
r = dsqrt(rijsq) |
| 627 |
|
|
|
| 628 |
|
|
call getLJPot(r,pot,dudr,ljAtype_i,ljAtype_j) |
| 629 |
|
|
#ifdef IS_MPI |
| 630 |
|
|
eRow(i) = eRow(i) + pot*0.5 |
| 631 |
|
|
eCol(i) = eCol(i) + pot*0.5 |
| 632 |
|
|
#else |
| 633 |
|
|
pe = pe + pot |
| 634 |
|
|
#endif |
| 635 |
mmeineke |
285 |
|
| 636 |
|
|
drdx = -rxij / r |
| 637 |
|
|
drdy = -ryij / r |
| 638 |
|
|
drdz = -rzij / r |
| 639 |
|
|
|
| 640 |
|
|
fx = dudr * drdx |
| 641 |
|
|
fy = dudr * drdy |
| 642 |
|
|
fz = dudr * drdz |
| 643 |
|
|
|
| 644 |
mmeineke |
270 |
#ifdef IS_MPI |
| 645 |
mmeineke |
285 |
fCol(1,j) = fCol(1,j) - fx |
| 646 |
|
|
fCol(2,j) = fCol(2,j) - fy |
| 647 |
|
|
fCol(3,j) = fCol(3,j) - fz |
| 648 |
|
|
|
| 649 |
|
|
fRow(1,j) = fRow(1,j) + fx |
| 650 |
|
|
fRow(2,j) = fRow(2,j) + fy |
| 651 |
|
|
fRow(3,j) = fRow(3,j) + fz |
| 652 |
|
|
#else |
| 653 |
|
|
f(1,j) = f(1,j) - fx |
| 654 |
|
|
f(2,j) = f(2,j) - fy |
| 655 |
|
|
f(3,j) = f(3,j) - fz |
| 656 |
|
|
f(1,i) = f(1,i) + fx |
| 657 |
|
|
f(2,i) = f(2,i) + fy |
| 658 |
|
|
f(3,i) = f(3,i) + fz |
| 659 |
|
|
#endif |
| 660 |
|
|
|
| 661 |
|
|
if (do_stress) then |
| 662 |
|
|
tauTemp(1) = tauTemp(1) + fx * rxij |
| 663 |
|
|
tauTemp(2) = tauTemp(2) + fx * ryij |
| 664 |
|
|
tauTemp(3) = tauTemp(3) + fx * rzij |
| 665 |
|
|
tauTemp(4) = tauTemp(4) + fy * rxij |
| 666 |
|
|
tauTemp(5) = tauTemp(5) + fy * ryij |
| 667 |
|
|
tauTemp(6) = tauTemp(6) + fy * rzij |
| 668 |
|
|
tauTemp(7) = tauTemp(7) + fz * rxij |
| 669 |
|
|
tauTemp(8) = tauTemp(8) + fz * ryij |
| 670 |
|
|
tauTemp(9) = tauTemp(9) + fz * rzij |
| 671 |
|
|
endif |
| 672 |
|
|
|
| 673 |
|
|
|
| 674 |
|
|
endif |
| 675 |
|
|
enddo |
| 676 |
|
|
endif |
| 677 |
|
|
enddo |
| 678 |
|
|
endif |
| 679 |
|
|
|
| 680 |
mmeineke |
270 |
|
| 681 |
|
|
|
| 682 |
|
|
#ifdef IS_MPI |
| 683 |
|
|
!!distribute forces |
| 684 |
|
|
|
| 685 |
|
|
call scatter(fRow,f,plan_row3d) |
| 686 |
|
|
|
| 687 |
|
|
call scatter(fCol,fMPITemp,plan_col3d) |
| 688 |
|
|
|
| 689 |
|
|
do i = 1,nlocal |
| 690 |
|
|
f(1:3,i) = f(1:3,i) + fMPITemp(1:3,i) |
| 691 |
|
|
end do |
| 692 |
|
|
|
| 693 |
|
|
|
| 694 |
|
|
|
| 695 |
|
|
if (do_pot) then |
| 696 |
mmeineke |
285 |
! scatter/gather pot_row into the members of my column |
| 697 |
mmeineke |
270 |
call scatter(eRow,eTemp,plan_row) |
| 698 |
|
|
|
| 699 |
|
|
! scatter/gather pot_local into all other procs |
| 700 |
|
|
! add resultant to get total pot |
| 701 |
|
|
do i = 1, nlocal |
| 702 |
|
|
pe_local = pe_local + eTemp(i) |
| 703 |
|
|
enddo |
| 704 |
|
|
if (newtons_thrd) then |
| 705 |
|
|
eTemp = 0.0E0_DP |
| 706 |
|
|
call scatter(eCol,eTemp,plan_col) |
| 707 |
|
|
do i = 1, nlocal |
| 708 |
|
|
pe_local = pe_local + eTemp(i) |
| 709 |
|
|
enddo |
| 710 |
|
|
endif |
| 711 |
|
|
pe = pe_local |
| 712 |
|
|
endif |
| 713 |
mmeineke |
285 |
|
| 714 |
mmeineke |
270 |
#endif |
| 715 |
|
|
|
| 716 |
|
|
potE = pe |
| 717 |
|
|
|
| 718 |
mmeineke |
285 |
|
| 719 |
|
|
if (do_stress) then |
| 720 |
|
|
#ifdef IS_MPI |
| 721 |
|
|
mpi_allreduce = (tau,tauTemp,9,mpi_double_precision,mpi_sum, & |
| 722 |
|
|
mpi_comm_world,mpi_err) |
| 723 |
|
|
#else |
| 724 |
|
|
tau = tauTemp |
| 725 |
|
|
#endif |
| 726 |
|
|
endif |
| 727 |
|
|
|
| 728 |
|
|
|
| 729 |
mmeineke |
270 |
end subroutine do_lj_ff |
| 730 |
|
|
|
| 731 |
|
|
!! Calculates the potential between two lj particles based on two lj_atype pointers, optionally returns second |
| 732 |
|
|
!! derivatives. |
| 733 |
|
|
subroutine getLjPot(r,pot,dudr,atype1,atype2,d2,status) |
| 734 |
|
|
! arguments |
| 735 |
|
|
!! Length of vector between particles |
| 736 |
|
|
real( kind = dp ), intent(in) :: r |
| 737 |
|
|
!! Potential Energy |
| 738 |
|
|
real( kind = dp ), intent(out) :: pot |
| 739 |
|
|
!! Derivatve wrt postion |
| 740 |
|
|
real( kind = dp ), intent(out) :: dudr |
| 741 |
|
|
!! Second Derivative, optional, used mainly for normal mode calculations. |
| 742 |
|
|
real( kind = dp ), intent(out), optional :: d2 |
| 743 |
|
|
|
| 744 |
|
|
type (lj_atype), pointer :: atype1 |
| 745 |
|
|
type (lj_atype), pointer :: atype2 |
| 746 |
|
|
|
| 747 |
|
|
integer, intent(out), optional :: status |
| 748 |
|
|
|
| 749 |
|
|
! local Variables |
| 750 |
|
|
real( kind = dp ) :: sigma |
| 751 |
|
|
real( kind = dp ) :: sigma2 |
| 752 |
|
|
real( kind = dp ) :: sigma6 |
| 753 |
|
|
real( kind = dp ) :: epsilon |
| 754 |
|
|
|
| 755 |
|
|
real( kind = dp ) :: rcut |
| 756 |
|
|
real( kind = dp ) :: rcut2 |
| 757 |
|
|
real( kind = dp ) :: rcut6 |
| 758 |
|
|
real( kind = dp ) :: r2 |
| 759 |
|
|
real( kind = dp ) :: r6 |
| 760 |
|
|
|
| 761 |
|
|
real( kind = dp ) :: t6 |
| 762 |
|
|
real( kind = dp ) :: t12 |
| 763 |
|
|
real( kind = dp ) :: tp6 |
| 764 |
|
|
real( kind = dp ) :: tp12 |
| 765 |
|
|
real( kind = dp ) :: delta |
| 766 |
|
|
|
| 767 |
|
|
logical :: doSec = .false. |
| 768 |
|
|
|
| 769 |
|
|
integer :: errorStat |
| 770 |
|
|
|
| 771 |
|
|
!! Optional Argument Checking |
| 772 |
|
|
! Check to see if we need to do second derivatives |
| 773 |
|
|
|
| 774 |
|
|
if (present(d2)) doSec = .true. |
| 775 |
|
|
if (present(status)) status = 0 |
| 776 |
|
|
|
| 777 |
|
|
! Look up the correct parameters in the mixing matrix |
| 778 |
|
|
sigma = ljMixed(atype1%atype_ident,atype2%atype_ident)%sigma |
| 779 |
|
|
sigma2 = ljMixed(atype1%atype_ident,atype2%atype_ident)%sigma2 |
| 780 |
|
|
sigma6 = ljMixed(atype1%atype_ident,atype2%atype_ident)%sigma6 |
| 781 |
|
|
epsilon = ljMixed(atype1%atype_ident,atype2%atype_ident)%epsilon |
| 782 |
|
|
|
| 783 |
|
|
|
| 784 |
|
|
|
| 785 |
|
|
|
| 786 |
|
|
call getRcut(rcut,rcut2=rcut2,rcut6=rcut6,status=errorStat) |
| 787 |
|
|
|
| 788 |
|
|
r2 = r * r |
| 789 |
|
|
r6 = r2 * r2 * r2 |
| 790 |
|
|
|
| 791 |
|
|
t6 = sigma6/ r6 |
| 792 |
|
|
t12 = t6 * t6 |
| 793 |
|
|
|
| 794 |
|
|
|
| 795 |
|
|
|
| 796 |
|
|
tp6 = sigma6 / rcut6 |
| 797 |
|
|
tp12 = tp6*tp6 |
| 798 |
|
|
|
| 799 |
|
|
delta = -4.0E0_DP*epsilon * (tp12 - tp6) |
| 800 |
|
|
|
| 801 |
|
|
if (r.le.rcut) then |
| 802 |
|
|
pot = 4.0E0_DP * epsilon * (t12 - t6) + delta |
| 803 |
|
|
dudr = 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / r |
| 804 |
|
|
if(doSec) d2 = 24.0E0_DP * epsilon * (26.0E0_DP*t12 - 7.0E0_DP*t6)/r/r |
| 805 |
|
|
else |
| 806 |
|
|
pot = 0.0E0_DP |
| 807 |
|
|
dudr = 0.0E0_DP |
| 808 |
|
|
if(doSec) d2 = 0.0E0_DP |
| 809 |
|
|
endif |
| 810 |
|
|
|
| 811 |
|
|
return |
| 812 |
|
|
|
| 813 |
|
|
|
| 814 |
|
|
|
| 815 |
|
|
end subroutine getLjPot |
| 816 |
|
|
|
| 817 |
|
|
|
| 818 |
|
|
!! Calculates the mixing for sigma or epslon based on character string for initialzition of mixing array. |
| 819 |
|
|
function calcLJMix(thisParam,param1,param2,status) result(myMixParam) |
| 820 |
|
|
character(len=*) :: thisParam |
| 821 |
|
|
real(kind = dp) :: param1 |
| 822 |
|
|
real(kind = dp) :: param2 |
| 823 |
|
|
real(kind = dp ) :: myMixParam |
| 824 |
mmeineke |
285 |
character(len = getStringLen()) :: thisMixingRule |
| 825 |
mmeineke |
270 |
integer, optional :: status |
| 826 |
|
|
|
| 827 |
mmeineke |
285 |
!! get the mixing rules from the simulation |
| 828 |
|
|
thisMixingRule = returnMixingRules() |
| 829 |
mmeineke |
270 |
myMixParam = 0.0_dp |
| 830 |
|
|
|
| 831 |
|
|
if (present(status)) status = 0 |
| 832 |
mmeineke |
285 |
select case (thisMixingRule) |
| 833 |
|
|
case ("standard") |
| 834 |
|
|
select case (thisParam) |
| 835 |
|
|
case ("sigma") |
| 836 |
|
|
myMixParam = 0.5_dp * (param1 + param2) |
| 837 |
|
|
case ("epsilon") |
| 838 |
|
|
myMixParam = sqrt(param1 * param2) |
| 839 |
|
|
case default |
| 840 |
|
|
status = -1 |
| 841 |
|
|
end select |
| 842 |
|
|
case("LJglass") |
| 843 |
mmeineke |
270 |
case default |
| 844 |
|
|
status = -1 |
| 845 |
|
|
end select |
| 846 |
|
|
end function calcLJMix |
| 847 |
|
|
|
| 848 |
|
|
|
| 849 |
|
|
|
| 850 |
|
|
end module lj_ff |
