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!! |
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!! Copyright (c) 2005 The University of Notre Dame. All Rights Reserved. |
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!! |
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!! The University of Notre Dame grants you ("Licensee") a |
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!! non-exclusive, royalty free, license to use, modify and |
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!! redistribute this software in source and binary code form, provided |
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!! that the following conditions are met: |
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!! |
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!! 1. Acknowledgement of the program authors must be made in any |
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!! publication of scientific results based in part on use of the |
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!! program. An acceptable form of acknowledgement is citation of |
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!! the article in which the program was described (Matthew |
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!! A. Meineke, Charles F. Vardeman II, Teng Lin, Christopher |
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!! J. Fennell and J. Daniel Gezelter, "OOPSE: An Object-Oriented |
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!! Parallel Simulation Engine for Molecular Dynamics," |
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!! J. Comput. Chem. 26, pp. 252-271 (2005)) |
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!! |
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!! 2. Redistributions of source code must retain the above copyright |
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!! notice, this list of conditions and the following disclaimer. |
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!! |
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!! 3. Redistributions in binary form must reproduce the above copyright |
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!! notice, this list of conditions and the following disclaimer in the |
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!! documentation and/or other materials provided with the |
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!! distribution. |
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!! |
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!! This software is provided "AS IS," without a warranty of any |
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!! kind. All express or implied conditions, representations and |
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!! warranties, including any implied warranty of merchantability, |
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!! fitness for a particular purpose or non-infringement, are hereby |
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!! excluded. The University of Notre Dame and its licensors shall not |
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!! be liable for any damages suffered by licensee as a result of |
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!! using, modifying or distributing the software or its |
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!! derivatives. In no event will the University of Notre Dame or its |
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!! licensors be liable for any lost revenue, profit or data, or for |
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!! direct, indirect, special, consequential, incidental or punitive |
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!! damages, however caused and regardless of the theory of liability, |
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!! arising out of the use of or inability to use software, even if the |
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!! University of Notre Dame has been advised of the possibility of |
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!! such damages. |
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!! |
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|
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|
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!! Calculates Long Range forces Lennard-Jones interactions. |
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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 1.13 2005-08-09 22:33:48 gezelter Exp $, $Date: 2005-08-09 22:33:48 $, $Name: not supported by cvs2svn $, $Revision: 1.13 $ |
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module lj |
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use atype_module |
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use vector_class |
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use simulation |
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use status |
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#ifdef IS_MPI |
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use mpiSimulation |
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#endif |
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use force_globals |
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|
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implicit none |
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PRIVATE |
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|
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integer, parameter :: DP = selected_real_kind(15) |
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|
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logical, save :: useGeometricDistanceMixing = .false. |
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logical, save :: haveMixingMap = .false. |
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|
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real(kind=DP), save :: defaultCutoff = 0.0_DP |
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logical, save :: defaultShift = .false. |
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logical, save :: haveDefaultCutoff = .false. |
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|
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|
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type, private :: LJtype |
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integer :: atid |
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real(kind=dp) :: sigma |
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real(kind=dp) :: epsilon |
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logical :: isSoftCore = .false. |
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end type LJtype |
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|
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type, private :: LJList |
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integer :: nLJtypes = 0 |
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integer :: currentLJtype = 0 |
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type(LJtype), pointer :: LJtypes(:) => null() |
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integer, pointer :: atidToLJtype(:) => null() |
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end type LJList |
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|
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type(LJList), save :: LJMap |
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|
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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) :: sigma6 |
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real(kind=dp) :: rCut |
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real(kind=dp) :: delta |
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logical :: rCutWasSet = .false. |
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logical :: shiftedPot |
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logical :: isSoftCore = .false. |
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end type MixParameters |
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|
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type(MixParameters), dimension(:,:), allocatable :: MixingMap |
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|
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public :: newLJtype |
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public :: setLJDefaultCutoff |
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public :: setLJUniformCutoff |
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public :: setLJCutoffByTypes |
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public :: getSigma |
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public :: getEpsilon |
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public :: useGeometricMixing |
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public :: do_lj_pair |
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public :: destroyLJtypes |
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|
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contains |
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|
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subroutine newLJtype(c_ident, sigma, epsilon, isSoftCore, 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) :: isSoftCore |
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integer,intent(out) :: status |
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integer :: nLJTypes, ntypes, myATID |
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integer, pointer :: MatchList(:) => null() |
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integer :: current |
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|
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status = 0 |
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! check to see if this is the first time into this routine... |
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if (.not.associated(LJMap%LJtypes)) then |
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|
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call getMatchingElementList(atypes, "is_LennardJones", .true., & |
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nLJTypes, MatchList) |
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|
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LJMap%nLJtypes = nLJTypes |
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|
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allocate(LJMap%LJtypes(nLJTypes)) |
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|
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ntypes = getSize(atypes) |
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|
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allocate(LJMap%atidToLJtype(ntypes)) |
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end if |
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|
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LJMap%currentLJtype = LJMap%currentLJtype + 1 |
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current = LJMap%currentLJtype |
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|
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myATID = getFirstMatchingElement(atypes, "c_ident", c_ident) |
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LJMap%atidToLJtype(myATID) = current |
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LJMap%LJtypes(current)%atid = myATID |
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LJMap%LJtypes(current)%sigma = sigma |
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LJMap%LJtypes(current)%epsilon = epsilon |
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if (isSoftCore .eq. 1) then |
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LJMap%LJtypes(current)%isSoftCore = .true. |
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else |
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LJMap%LJtypes(current)%isSoftCore = .false. |
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endif |
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end subroutine newLJtype |
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|
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subroutine setLJDefaultCutoff(thisRcut, shiftedPot) |
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real(kind=dp), intent(in) :: thisRcut |
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logical, intent(in) :: shiftedPot |
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defaultCutoff = thisRcut |
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defaultShift = shiftedPot |
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haveDefaultCutoff = .true. |
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end subroutine setLJDefaultCutoff |
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|
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subroutine setLJUniformCutoff(thisRcut, shiftedPot) |
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real(kind=dp), intent(in) :: thisRcut |
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logical, intent(in) :: shiftedPot |
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integer :: nLJtypes, i, j |
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|
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if (LJMap%currentLJtype == 0) then |
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call handleError("LJ", "No members in LJMap") |
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return |
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end if |
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|
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nLJtypes = LJMap%nLJtypes |
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if (.not. allocated(MixingMap)) then |
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allocate(MixingMap(nLJtypes, nLJtypes)) |
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endif |
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|
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do i = 1, nLJtypes |
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do j = 1, nLJtypes |
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MixingMap(i,j)%rCut = thisRcut |
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MixingMap(i,j)%shiftedPot = shiftedPot |
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MixingMap(i,j)%rCutWasSet = .true. |
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enddo |
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enddo |
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call createMixingMap() |
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end subroutine setLJUniformCutoff |
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|
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subroutine setLJCutoffByTypes(atid1, atid2, thisRcut, shiftedPot) |
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integer, intent(in) :: atid1, atid2 |
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real(kind=dp), intent(in) :: thisRcut |
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logical, intent(in) :: shiftedPot |
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integer :: nLJtypes, ljt1, ljt2 |
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|
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if (LJMap%currentLJtype == 0) then |
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call handleError("LJ", "No members in LJMap") |
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return |
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end if |
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|
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nLJtypes = LJMap%nLJtypes |
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if (.not. allocated(MixingMap)) then |
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allocate(MixingMap(nLJtypes, nLJtypes)) |
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endif |
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|
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ljt1 = LJMap%atidToLJtype(atid1) |
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ljt2 = LJMap%atidToLJtype(atid2) |
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|
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MixingMap(ljt1,ljt2)%rCut = thisRcut |
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MixingMap(ljt1,ljt2)%shiftedPot = shiftedPot |
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MixingMap(ljt1,ljt2)%rCutWasSet = .true. |
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MixingMap(ljt2,ljt1)%rCut = thisRcut |
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MixingMap(ljt2,ljt1)%shiftedPot = shiftedPot |
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MixingMap(ljt2,ljt1)%rCutWasSet = .true. |
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|
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call createMixingMap() |
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end subroutine setLJCutoffByTypes |
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|
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function getSigma(atid) result (s) |
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integer, intent(in) :: atid |
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integer :: ljt1 |
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real(kind=dp) :: s |
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|
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if (LJMap%currentLJtype == 0) then |
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call handleError("LJ", "No members in LJMap") |
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return |
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end if |
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|
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ljt1 = LJMap%atidToLJtype(atid) |
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s = LJMap%LJtypes(ljt1)%sigma |
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|
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end function getSigma |
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|
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function getEpsilon(atid) result (e) |
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integer, intent(in) :: atid |
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integer :: ljt1 |
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real(kind=dp) :: e |
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|
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if (LJMap%currentLJtype == 0) then |
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call handleError("LJ", "No members in LJMap") |
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return |
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end if |
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|
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ljt1 = LJMap%atidToLJtype(atid) |
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e = LJMap%LJtypes(ljt1)%epsilon |
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|
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end function getEpsilon |
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|
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subroutine useGeometricMixing() |
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useGeometricDistanceMixing = .true. |
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haveMixingMap = .false. |
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return |
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end subroutine useGeometricMixing |
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|
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subroutine createMixingMap() |
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integer :: nLJtypes, i, j |
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real ( kind = dp ) :: s1, s2, e1, e2 |
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real ( kind = dp ) :: rcut6, tp6, tp12 |
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logical :: isSoftCore1, isSoftCore2 |
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|
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if (LJMap%currentLJtype == 0) then |
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call handleError("LJ", "No members in LJMap") |
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return |
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end if |
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|
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nLJtypes = LJMap%nLJtypes |
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|
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if (.not. allocated(MixingMap)) then |
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allocate(MixingMap(nLJtypes, nLJtypes)) |
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endif |
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|
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do i = 1, nLJtypes |
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|
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s1 = LJMap%LJtypes(i)%sigma |
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e1 = LJMap%LJtypes(i)%epsilon |
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isSoftCore1 = LJMap%LJtypes(i)%isSoftCore |
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|
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do j = i, nLJtypes |
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|
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s2 = LJMap%LJtypes(j)%sigma |
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e2 = LJMap%LJtypes(j)%epsilon |
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isSoftCore2 = LJMap%LJtypes(j)%isSoftCore |
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|
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MixingMap(i,j)%isSoftCore = isSoftCore1 .or. isSoftCore2 |
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|
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! only the distance parameter uses different mixing policies |
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if (useGeometricDistanceMixing) then |
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MixingMap(i,j)%sigma = dsqrt(s1 * s2) |
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else |
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MixingMap(i,j)%sigma = 0.5_dp * (s1 + s2) |
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endif |
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|
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MixingMap(i,j)%epsilon = dsqrt(e1 * e2) |
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|
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MixingMap(i,j)%sigma6 = (MixingMap(i,j)%sigma)**6 |
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|
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if (MixingMap(i,j)%rCutWasSet) then |
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rcut6 = (MixingMap(i,j)%rcut)**6 |
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else |
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if (haveDefaultCutoff) then |
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rcut6 = defaultCutoff**6 |
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else |
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call handleError("LJ", "No specified or default cutoff value!") |
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endif |
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endif |
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|
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tp6 = MixingMap(i,j)%sigma6/rcut6 |
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tp12 = tp6**2 |
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|
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MixingMap(i,j)%delta =-4.0_DP*MixingMap(i,j)%epsilon*(tp12 - tp6) |
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enddo |
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enddo |
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|
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haveMixingMap = .true. |
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|
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end subroutine createMixingMap |
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|
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subroutine do_lj_pair(atom1, atom2, d, rij, r2, sw, vpair, fpair, & |
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pot, f, do_pot) |
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|
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integer, intent(in) :: atom1, atom2 |
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integer :: atid1, atid2, ljt1, ljt2 |
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real( kind = dp ), intent(in) :: rij, r2 |
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real( kind = dp ) :: pot, sw, vpair |
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real( kind = dp ), dimension(3,nLocal) :: f |
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real( kind = dp ), intent(in), dimension(3) :: d |
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real( kind = dp ), intent(inout), dimension(3) :: fpair |
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logical, intent(in) :: do_pot |
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|
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! local Variables |
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real( kind = dp ) :: drdx, drdy, drdz |
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real( kind = dp ) :: fx, fy, fz |
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real( kind = dp ) :: pot_temp, dudr |
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real( kind = dp ) :: sigma6 |
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real( kind = dp ) :: epsilon |
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real( kind = dp ) :: r6 |
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real( kind = dp ) :: t6 |
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real( kind = dp ) :: t12 |
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real( kind = dp ) :: delta |
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logical :: isSoftCore, shiftedPot |
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integer :: id1, id2, localError |
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|
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if (.not.haveMixingMap) then |
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call createMixingMap() |
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endif |
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|
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! Look up the correct parameters in the mixing matrix |
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#ifdef IS_MPI |
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atid1 = atid_Row(atom1) |
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atid2 = atid_Col(atom2) |
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#else |
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atid1 = atid(atom1) |
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atid2 = atid(atom2) |
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#endif |
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|
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ljt1 = LJMap%atidToLJtype(atid1) |
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ljt2 = LJMap%atidToLJtype(atid2) |
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|
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sigma6 = MixingMap(ljt1,ljt2)%sigma6 |
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epsilon = MixingMap(ljt1,ljt2)%epsilon |
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delta = MixingMap(ljt1,ljt2)%delta |
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isSoftCore = MixingMap(ljt1,ljt2)%isSoftCore |
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shiftedPot = MixingMap(ljt1,ljt2)%shiftedPot |
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|
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r6 = r2 * r2 * r2 |
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|
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t6 = sigma6/ r6 |
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t12 = t6 * t6 |
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|
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if (isSoftCore) then |
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|
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pot_temp = 4.0E0_DP * epsilon * t6 |
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if (shiftedPot) then |
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pot_temp = pot_temp + delta |
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endif |
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|
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vpair = vpair + pot_temp |
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|
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dudr = -sw * 24.0E0_DP * epsilon * t6 / rij |
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|
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else |
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pot_temp = 4.0E0_DP * epsilon * (t12 - t6) |
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if (shiftedPot) then |
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pot_temp = pot_temp + delta |
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endif |
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|
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vpair = vpair + pot_temp |
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|
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dudr = sw * 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij |
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endif |
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|
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drdx = d(1) / rij |
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drdy = d(2) / rij |
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drdz = d(3) / rij |
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|
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fx = dudr * drdx |
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fy = dudr * drdy |
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fz = dudr * drdz |
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|
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|
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#ifdef IS_MPI |
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if (do_pot) then |
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pot_Row(atom1) = pot_Row(atom1) + sw*pot_temp*0.5 |
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pot_Col(atom2) = pot_Col(atom2) + sw*pot_temp*0.5 |
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endif |
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|
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f_Row(1,atom1) = f_Row(1,atom1) + fx |
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f_Row(2,atom1) = f_Row(2,atom1) + fy |
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f_Row(3,atom1) = f_Row(3,atom1) + fz |
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|
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f_Col(1,atom2) = f_Col(1,atom2) - fx |
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f_Col(2,atom2) = f_Col(2,atom2) - fy |
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f_Col(3,atom2) = f_Col(3,atom2) - fz |
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|
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#else |
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if (do_pot) pot = pot + sw*pot_temp |
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|
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f(1,atom1) = f(1,atom1) + fx |
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f(2,atom1) = f(2,atom1) + fy |
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f(3,atom1) = f(3,atom1) + fz |
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|
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f(1,atom2) = f(1,atom2) - fx |
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f(2,atom2) = f(2,atom2) - fy |
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f(3,atom2) = f(3,atom2) - fz |
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#endif |
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|
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#ifdef IS_MPI |
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id1 = AtomRowToGlobal(atom1) |
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id2 = AtomColToGlobal(atom2) |
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#else |
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id1 = atom1 |
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id2 = atom2 |
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#endif |
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|
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if (molMembershipList(id1) .ne. molMembershipList(id2)) then |
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|
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fpair(1) = fpair(1) + fx |
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fpair(2) = fpair(2) + fy |
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fpair(3) = fpair(3) + fz |
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|
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endif |
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|
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return |
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|
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end subroutine do_lj_pair |
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|
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subroutine destroyLJTypes() |
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|
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LJMap%nLJtypes = 0 |
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LJMap%currentLJtype = 0 |
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|
| 449 |
if (associated(LJMap%LJtypes)) then |
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deallocate(LJMap%LJtypes) |
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LJMap%LJtypes => null() |
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end if |
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|
| 454 |
if (associated(LJMap%atidToLJtype)) then |
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deallocate(LJMap%atidToLJtype) |
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LJMap%atidToLJtype => null() |
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end if |
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|
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haveMixingMap = .false. |
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end subroutine destroyLJTypes |
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|
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end module lj |
