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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 1.7 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 1.8 2005-02-25 21:22:00 tim Exp $, $Date: 2005-02-25 21:22:00 $, $Name: not supported by cvs2svn $, $Revision: 1.8 $ |
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module lj |
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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 :: soft_pot |
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end type LjType |
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type(LjType), dimension(:), allocatable :: ParameterMap |
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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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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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ParameterMap(myATID)%atid = myATID |
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ParameterMap(myATID)%epsilon = epsilon |
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ParameterMap(myATID)%sigma = sigma |
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if (soft_pot == 1) then |
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ParameterMap(myATID)%soft_pot = .true. |
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else |
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ParameterMap(myATID)%soft_pot = .false. |
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endif |
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end subroutine newLJtype |
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function getSigma(atid) result (s) |
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MixingMap(i,i)%epsilon = Epsilon_i |
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MixingMap(i,i)%delta = -4.0_DP * MixingMap(i,i)%epsilon * & |
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(MixingMap(i,i)%tp12 - MixingMap(i,i)%tp6) |
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MixingMap(i,i)%soft_pot = ParameterMap(i)%soft_pot |
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do j = i + 1, nATIDs |
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MixingMap(i,j)%delta = -4.0_DP * MixingMap(i,j)%epsilon * & |
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(MixingMap(i,j)%tp12 - MixingMap(i,j)%tp6) |
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MixingMap(i,j)%soft_pot = ParameterMap(i)%soft_pot .or. ParameterMap(j)%soft_pot |
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MixingMap(j,i)%sigma = MixingMap(i,j)%sigma |
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MixingMap(j,i)%sigma6 = MixingMap(i,j)%sigma6 |
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MixingMap(j,i)%tp12 = MixingMap(i,j)%tp12 |
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MixingMap(j,i)%epsilon = MixingMap(i,j)%epsilon |
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MixingMap(j,i)%delta = MixingMap(i,j)%delta |
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MixingMap(j,i)%soft_pot = MixingMap(i,j)%soft_pot |
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end do |
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end do |
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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 :: soft_pot |
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integer :: id1, id2, localError |
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if (.not.haveMixingMap) then |
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sigma6 = MixingMap(atid_Row(atom1),atid_Col(atom2))%sigma6 |
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epsilon = MixingMap(atid_Row(atom1),atid_Col(atom2))%epsilon |
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delta = MixingMap(atid_Row(atom1),atid_Col(atom2))%delta |
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soft_pot = MixingMap(atid_Row(atom1),atid_Col(atom2))%soft_pot |
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#else |
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sigma6 = MixingMap(atid(atom1),atid(atom2))%sigma6 |
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epsilon = MixingMap(atid(atom1),atid(atom2))%epsilon |
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delta = MixingMap(atid(atom1),atid(atom2))%delta |
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soft_pot = MixingMap(atid(atom1),atid(atom2))%soft_pot |
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#endif |
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r6 = r2 * r2 * r2 |
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t6 = sigma6/ r6 |
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t12 = t6 * t6 |
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pot_temp = 4.0E0_DP * epsilon * (t12 - t6) |
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if (LJ_do_shift) then |
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pot_temp = pot_temp + delta |
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endif |
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vpair = vpair + pot_temp |
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if (soft_pot) then |
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pot_temp = 4.0E0_DP * epsilon * t12 |
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if (LJ_do_shift) then |
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pot_temp = pot_temp + delta |
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endif |
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vpair = vpair + pot_temp |
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dudr = sw * 24.0E0_DP * epsilon * (-2.0E0_DP)*t12 / rij |
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else |
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pot_temp = 4.0E0_DP * epsilon * (t12 - t6) |
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if (LJ_do_shift) then |
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pot_temp = pot_temp + delta |
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endif |
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vpair = vpair + pot_temp |
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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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dudr = sw * 24.0E0_DP * epsilon * (t6 - 2.0E0_DP*t12) / rij |
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drdx = d(1) / rij |
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drdy = d(2) / rij |
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drdz = d(3) / rij |