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!! Calculates Long Range forces Lennard-Jones interactions. |
44 |
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!! @author Charles F. Vardeman II |
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!! @author Matthew Meineke |
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< |
!! @version $Id: LJ.F90,v 1.7 2005-01-14 20:31:16 gezelter Exp $, $Date: 2005-01-14 20:31:16 $, $Name: not supported by cvs2svn $, $Revision: 1.7 $ |
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!! @version $Id: LJ.F90,v 1.11 2005-04-15 22:03:47 gezelter Exp $, $Date: 2005-04-15 22:03:47 $, $Name: not supported by cvs2svn $, $Revision: 1.11 $ |
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module lj |
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implicit none |
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PRIVATE |
62 |
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63 |
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integer, parameter :: DP = selected_real_kind(15) |
64 |
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64 |
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65 |
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type, private :: LjType |
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integer :: c_ident |
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integer :: atid |
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real(kind=dp) :: sigma |
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real(kind=dp) :: epsilon |
70 |
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logical :: soft_pot |
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end type LjType |
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72 |
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73 |
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type(LjType), dimension(:), allocatable :: ParameterMap |
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logical, save :: haveMixingMap = .false. |
76 |
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76 |
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type :: MixParameters |
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real(kind=DP) :: sigma |
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real(kind=DP) :: epsilon |
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real(kind=dp) :: tp6 |
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real(kind=dp) :: tp12 |
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real(kind=dp) :: delta |
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logical :: soft_pot |
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end type MixParameters |
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type(MixParameters), dimension(:,:), allocatable :: MixingMap |
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88 |
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real(kind=DP), save :: LJ_rcut |
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logical, save :: have_rcut = .false. |
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logical, save :: LJ_do_shift = .false. |
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logical, save :: useGeometricDistanceMixing = .false. |
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!! Public methods and data |
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public :: setCutoffLJ |
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public :: useGeometricMixing |
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public :: do_lj_pair |
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public :: newLJtype |
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public :: getSigma |
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public :: getEpsilon |
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102 |
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public :: destroyLJTypes |
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contains |
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subroutine newLJtype(c_ident, sigma, epsilon, status) |
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subroutine newLJtype(c_ident, sigma, epsilon, soft_pot, status) |
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integer,intent(in) :: c_ident |
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real(kind=dp),intent(in) :: sigma |
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real(kind=dp),intent(in) :: epsilon |
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integer, intent(in) :: soft_pot |
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integer,intent(out) :: status |
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integer :: nATypes, myATID |
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integer, pointer :: MatchList(:) => null() |
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status = 0 |
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myATID = getFirstMatchingElement(atypes, "c_ident", c_ident) |
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if (.not.allocated(ParameterMap)) then |
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!call getMatchingElementList(atypes, "is_LennardJones", .true., & |
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! nLJTypes, MatchList) |
123 |
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nAtypes = getSize(atypes) |
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status = -1 |
126 |
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return |
127 |
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end if |
128 |
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128 |
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129 |
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if (.not. allocated(ParameterMap)) then |
130 |
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allocate(ParameterMap(nAtypes)) |
131 |
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endif |
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133 |
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end if |
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135 |
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if (myATID .gt. size(ParameterMap)) then |
136 |
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status = -1 |
137 |
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return |
138 |
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endif |
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139 |
> |
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! set the values for ParameterMap for this atom type: |
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142 |
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ParameterMap(myATID)%c_ident = c_ident |
143 |
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ParameterMap(myATID)%atid = myATID |
144 |
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ParameterMap(myATID)%epsilon = epsilon |
145 |
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ParameterMap(myATID)%sigma = sigma |
146 |
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|
146 |
> |
if (soft_pot == 1) then |
147 |
> |
ParameterMap(myATID)%soft_pot = .true. |
148 |
> |
else |
149 |
> |
ParameterMap(myATID)%soft_pot = .false. |
150 |
> |
endif |
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end subroutine newLJtype |
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|
153 |
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function getSigma(atid) result (s) |
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integer, intent(in) :: atid |
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integer :: localError |
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real(kind=dp) :: s |
157 |
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157 |
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158 |
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if (.not.allocated(ParameterMap)) then |
159 |
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call handleError("LJ", "no ParameterMap was present before first call of getSigma!") |
160 |
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return |
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end if |
162 |
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162 |
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163 |
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s = ParameterMap(atid)%sigma |
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end function getSigma |
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integer, intent(in) :: atid |
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integer :: localError |
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real(kind=dp) :: e |
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171 |
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if (.not.allocated(ParameterMap)) then |
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call handleError("LJ", "no ParameterMap was present before first call of getEpsilon!") |
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return |
174 |
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end if |
175 |
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175 |
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e = ParameterMap(atid)%epsilon |
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end function getEpsilon |
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LJ_do_shift = do_shift |
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call set_switch(LJ_SWITCH, rcut, rcut) |
193 |
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have_rcut = .true. |
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195 |
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return |
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end subroutine setCutoffLJ |
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haveMixingMap = .false. |
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return |
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end subroutine useGeometricMixing |
203 |
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203 |
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subroutine createMixingMap(status) |
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integer :: nATIDs |
206 |
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integer :: status |
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real ( kind = dp ) :: Sigma_i, Sigma_j |
210 |
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real ( kind = dp ) :: Epsilon_i, Epsilon_j |
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real ( kind = dp ) :: rcut6 |
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logical :: i_is_LJ, j_is_LJ |
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status = 0 |
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216 |
> |
if (.not. allocated(ParameterMap)) then |
217 |
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call handleError("LJ", "no ParameterMap was present before call of createMixingMap!") |
218 |
> |
status = -1 |
219 |
> |
return |
220 |
> |
endif |
221 |
> |
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nATIDs = size(ParameterMap) |
223 |
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223 |
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224 |
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if (nATIDs == 0) then |
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status = -1 |
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return |
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end if |
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if (.not. allocated(MixingMap)) then |
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allocate(MixingMap(nATIDs, nATIDs)) |
231 |
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endif |
232 |
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|
233 |
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if (.not.have_rcut) then |
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status = -1 |
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return |
236 |
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endif |
237 |
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219 |
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if (.not. allocated(MixingMap)) then |
220 |
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allocate(MixingMap(nATIDs, nATIDs)) |
221 |
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endif |
222 |
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237 |
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238 |
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rcut6 = LJ_rcut**6 |
239 |
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! This loops through all atypes, even those that don't support LJ forces. |
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do i = 1, nATIDs |
242 |
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243 |
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Epsilon_i = ParameterMap(i)%epsilon |
244 |
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Sigma_i = ParameterMap(i)%sigma |
245 |
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246 |
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! do self mixing rule |
247 |
< |
MixingMap(i,i)%sigma = Sigma_i |
248 |
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MixingMap(i,i)%sigma6 = Sigma_i ** 6 |
249 |
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MixingMap(i,i)%tp6 = (MixingMap(i,i)%sigma6)/rcut6 |
250 |
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MixingMap(i,i)%tp12 = (MixingMap(i,i)%tp6) ** 2 |
251 |
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MixingMap(i,i)%epsilon = Epsilon_i |
252 |
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MixingMap(i,i)%delta = -4.0_DP * MixingMap(i,i)%epsilon * & |
253 |
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(MixingMap(i,i)%tp12 - MixingMap(i,i)%tp6) |
254 |
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|
255 |
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do j = i + 1, nATIDs |
256 |
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257 |
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Epsilon_j = ParameterMap(j)%epsilon |
258 |
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Sigma_j = ParameterMap(j)%sigma |
259 |
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|
260 |
< |
! only the distance parameter uses different mixing policies |
261 |
< |
if (useGeometricDistanceMixing) then |
262 |
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! only for OPLS as far as we can tell |
263 |
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MixingMap(i,j)%sigma = dsqrt(Sigma_i * Sigma_j) |
264 |
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else |
265 |
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! everyone else |
266 |
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MixingMap(i,j)%sigma = 0.5_dp * (Sigma_i + Sigma_j) |
267 |
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endif |
268 |
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269 |
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! energy parameter is always geometric mean: |
270 |
< |
MixingMap(i,j)%epsilon = dsqrt(Epsilon_i * Epsilon_j) |
271 |
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|
272 |
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MixingMap(i,j)%sigma6 = (MixingMap(i,j)%sigma)**6 |
273 |
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MixingMap(i,j)%tp6 = MixingMap(i,j)%sigma6/rcut6 |
274 |
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MixingMap(i,j)%tp12 = (MixingMap(i,j)%tp6) ** 2 |
275 |
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|
276 |
< |
MixingMap(i,j)%delta = -4.0_DP * MixingMap(i,j)%epsilon * & |
277 |
< |
(MixingMap(i,j)%tp12 - MixingMap(i,j)%tp6) |
278 |
< |
|
279 |
< |
MixingMap(j,i)%sigma = MixingMap(i,j)%sigma |
280 |
< |
MixingMap(j,i)%sigma6 = MixingMap(i,j)%sigma6 |
281 |
< |
MixingMap(j,i)%tp6 = MixingMap(i,j)%tp6 |
282 |
< |
MixingMap(j,i)%tp12 = MixingMap(i,j)%tp12 |
283 |
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MixingMap(j,i)%epsilon = MixingMap(i,j)%epsilon |
284 |
< |
MixingMap(j,i)%delta = MixingMap(i,j)%delta |
285 |
< |
|
286 |
< |
end do |
242 |
> |
call getElementProperty(atypes, i, "is_LennardJones", i_is_LJ) |
243 |
> |
if (i_is_LJ) then |
244 |
> |
Epsilon_i = ParameterMap(i)%epsilon |
245 |
> |
Sigma_i = ParameterMap(i)%sigma |
246 |
> |
|
247 |
> |
! do self mixing rule |
248 |
> |
MixingMap(i,i)%sigma = Sigma_i |
249 |
> |
MixingMap(i,i)%sigma6 = Sigma_i ** 6 |
250 |
> |
MixingMap(i,i)%tp6 = (MixingMap(i,i)%sigma6)/rcut6 |
251 |
> |
MixingMap(i,i)%tp12 = (MixingMap(i,i)%tp6) ** 2 |
252 |
> |
MixingMap(i,i)%epsilon = Epsilon_i |
253 |
> |
MixingMap(i,i)%delta = -4.0_DP * MixingMap(i,i)%epsilon * & |
254 |
> |
(MixingMap(i,i)%tp12 - MixingMap(i,i)%tp6) |
255 |
> |
MixingMap(i,i)%soft_pot = ParameterMap(i)%soft_pot |
256 |
> |
|
257 |
> |
do j = i + 1, nATIDs |
258 |
> |
call getElementProperty(atypes, j, "is_LennardJones", j_is_LJ) |
259 |
> |
|
260 |
> |
if (j_is_LJ) then |
261 |
> |
Epsilon_j = ParameterMap(j)%epsilon |
262 |
> |
Sigma_j = ParameterMap(j)%sigma |
263 |
> |
|
264 |
> |
! only the distance parameter uses different mixing policies |
265 |
> |
if (useGeometricDistanceMixing) then |
266 |
> |
! only for OPLS as far as we can tell |
267 |
> |
MixingMap(i,j)%sigma = dsqrt(Sigma_i * Sigma_j) |
268 |
> |
else |
269 |
> |
! everyone else |
270 |
> |
MixingMap(i,j)%sigma = 0.5_dp * (Sigma_i + Sigma_j) |
271 |
> |
endif |
272 |
> |
|
273 |
> |
! energy parameter is always geometric mean: |
274 |
> |
MixingMap(i,j)%epsilon = dsqrt(Epsilon_i * Epsilon_j) |
275 |
> |
|
276 |
> |
MixingMap(i,j)%sigma6 = (MixingMap(i,j)%sigma)**6 |
277 |
> |
MixingMap(i,j)%tp6 = MixingMap(i,j)%sigma6/rcut6 |
278 |
> |
MixingMap(i,j)%tp12 = (MixingMap(i,j)%tp6) ** 2 |
279 |
> |
|
280 |
> |
MixingMap(i,j)%delta = -4.0_DP * MixingMap(i,j)%epsilon * & |
281 |
> |
(MixingMap(i,j)%tp12 - MixingMap(i,j)%tp6) |
282 |
> |
|
283 |
> |
MixingMap(i,j)%soft_pot = ParameterMap(i)%soft_pot .or. ParameterMap(j)%soft_pot |
284 |
> |
|
285 |
> |
|
286 |
> |
MixingMap(j,i)%sigma = MixingMap(i,j)%sigma |
287 |
> |
MixingMap(j,i)%sigma6 = MixingMap(i,j)%sigma6 |
288 |
> |
MixingMap(j,i)%tp6 = MixingMap(i,j)%tp6 |
289 |
> |
MixingMap(j,i)%tp12 = MixingMap(i,j)%tp12 |
290 |
> |
MixingMap(j,i)%epsilon = MixingMap(i,j)%epsilon |
291 |
> |
MixingMap(j,i)%delta = MixingMap(i,j)%delta |
292 |
> |
MixingMap(j,i)%soft_pot = MixingMap(i,j)%soft_pot |
293 |
> |
endif |
294 |
> |
end do |
295 |
> |
endif |
296 |
|
end do |
297 |
< |
|
297 |
> |
|
298 |
|
haveMixingMap = .true. |
299 |
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|
300 |
|
end subroutine createMixingMap |
301 |
< |
|
301 |
> |
|
302 |
|
subroutine do_lj_pair(atom1, atom2, d, rij, r2, sw, vpair, fpair, & |
303 |
|
pot, f, do_pot) |
304 |
|
|
320 |
|
real( kind = dp ) :: t6 |
321 |
|
real( kind = dp ) :: t12 |
322 |
|
real( kind = dp ) :: delta |
323 |
+ |
logical :: soft_pot |
324 |
|
integer :: id1, id2, localError |
325 |
|
|
326 |
|
if (.not.haveMixingMap) then |
337 |
|
sigma6 = MixingMap(atid_Row(atom1),atid_Col(atom2))%sigma6 |
338 |
|
epsilon = MixingMap(atid_Row(atom1),atid_Col(atom2))%epsilon |
339 |
|
delta = MixingMap(atid_Row(atom1),atid_Col(atom2))%delta |
340 |
+ |
soft_pot = MixingMap(atid_Row(atom1),atid_Col(atom2))%soft_pot |
341 |
|
#else |
342 |
|
sigma6 = MixingMap(atid(atom1),atid(atom2))%sigma6 |
343 |
|
epsilon = MixingMap(atid(atom1),atid(atom2))%epsilon |
344 |
|
delta = MixingMap(atid(atom1),atid(atom2))%delta |
345 |
+ |
soft_pot = MixingMap(atid(atom1),atid(atom2))%soft_pot |
346 |
|
#endif |
347 |
|
|
348 |
|
r6 = r2 * r2 * r2 |
349 |
< |
|
349 |
> |
|
350 |
|
t6 = sigma6/ r6 |
351 |
|
t12 = t6 * t6 |
352 |
< |
|
353 |
< |
pot_temp = 4.0E0_DP * epsilon * (t12 - t6) |
354 |
< |
if (LJ_do_shift) then |
355 |
< |
pot_temp = pot_temp + delta |
352 |
> |
|
353 |
> |
if (soft_pot) then |
354 |
> |
pot_temp = 4.0E0_DP * epsilon * t12 |
355 |
> |
if (LJ_do_shift) then |
356 |
> |
pot_temp = pot_temp + delta |
357 |
> |
endif |
358 |
> |
|
359 |
> |
vpair = vpair + pot_temp |
360 |
> |
|
361 |
> |
dudr = sw * 24.0E0_DP * epsilon * (-2.0E0_DP)*t12 / rij |
362 |
> |
|
363 |
> |
else |
364 |
> |
pot_temp = 4.0E0_DP * epsilon * (t12 - t6) |
365 |
> |
if (LJ_do_shift) then |
366 |
> |
pot_temp = pot_temp + delta |
367 |
> |
endif |
368 |
> |
|
369 |
> |
vpair = vpair + pot_temp |
370 |
> |
|
371 |
> |
dudr = sw * 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij |
372 |
|
endif |
373 |
|
|
331 |
– |
vpair = vpair + pot_temp |
332 |
– |
|
333 |
– |
dudr = sw * 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij |
334 |
– |
|
374 |
|
drdx = d(1) / rij |
375 |
|
drdy = d(2) / rij |
376 |
|
drdz = d(3) / rij |
377 |
< |
|
377 |
> |
|
378 |
|
fx = dudr * drdx |
379 |
|
fy = dudr * drdy |
380 |
|
fz = dudr * drdz |
381 |
< |
|
382 |
< |
|
381 |
> |
|
382 |
> |
|
383 |
|
#ifdef IS_MPI |
384 |
|
if (do_pot) then |
385 |
|
pot_Row(atom1) = pot_Row(atom1) + sw*pot_temp*0.5 |
386 |
|
pot_Col(atom2) = pot_Col(atom2) + sw*pot_temp*0.5 |
387 |
|
endif |
388 |
< |
|
388 |
> |
|
389 |
|
f_Row(1,atom1) = f_Row(1,atom1) + fx |
390 |
|
f_Row(2,atom1) = f_Row(2,atom1) + fy |
391 |
|
f_Row(3,atom1) = f_Row(3,atom1) + fz |
392 |
< |
|
392 |
> |
|
393 |
|
f_Col(1,atom2) = f_Col(1,atom2) - fx |
394 |
|
f_Col(2,atom2) = f_Col(2,atom2) - fy |
395 |
|
f_Col(3,atom2) = f_Col(3,atom2) - fz |
396 |
< |
|
396 |
> |
|
397 |
|
#else |
398 |
|
if (do_pot) pot = pot + sw*pot_temp |
399 |
|
|
400 |
|
f(1,atom1) = f(1,atom1) + fx |
401 |
|
f(2,atom1) = f(2,atom1) + fy |
402 |
|
f(3,atom1) = f(3,atom1) + fz |
403 |
< |
|
403 |
> |
|
404 |
|
f(1,atom2) = f(1,atom2) - fx |
405 |
|
f(2,atom2) = f(2,atom2) - fy |
406 |
|
f(3,atom2) = f(3,atom2) - fz |
407 |
|
#endif |
408 |
< |
|
408 |
> |
|
409 |
|
#ifdef IS_MPI |
410 |
|
id1 = AtomRowToGlobal(atom1) |
411 |
|
id2 = AtomColToGlobal(atom2) |
415 |
|
#endif |
416 |
|
|
417 |
|
if (molMembershipList(id1) .ne. molMembershipList(id2)) then |
418 |
< |
|
418 |
> |
|
419 |
|
fpair(1) = fpair(1) + fx |
420 |
|
fpair(2) = fpair(2) + fy |
421 |
|
fpair(3) = fpair(3) + fz |
423 |
|
endif |
424 |
|
|
425 |
|
return |
426 |
< |
|
426 |
> |
|
427 |
|
end subroutine do_lj_pair |
428 |
< |
|
429 |
< |
|
430 |
< |
!! Calculates the mixing for sigma or epslon |
431 |
< |
|
428 |
> |
|
429 |
> |
subroutine destroyLJTypes() |
430 |
> |
if(allocated(ParameterMap)) deallocate(ParameterMap) |
431 |
> |
if(allocated(MixingMap)) deallocate(MixingMap) |
432 |
> |
haveMixingMap = .false. |
433 |
> |
end subroutine destroyLJTypes |
434 |
> |
|
435 |
> |
|
436 |
|
end module lj |