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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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module switcheroo |
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|
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use definitions |
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use interpolation |
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use status |
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|
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implicit none |
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PRIVATE |
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|
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#define __FORTRAN90 |
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#include "UseTheForce/DarkSide/fSwitchingFunctionType.h" |
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|
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!! number of points for the spline approximations |
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INTEGER, PARAMETER :: np = 150 |
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|
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real ( kind = dp ), save :: rin |
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real ( kind = dp ), save :: rout |
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real ( kind = dp ), save :: rin2 |
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real ( kind = dp ), save :: rout2 |
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|
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logical, save :: haveSplines = .false. |
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logical, save :: switchIsCubic = .true. |
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integer, save :: functionType = CUBIC |
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|
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! spline structures |
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type(cubicSpline), save :: r2Spline |
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type(cubicSpline), save :: switchSpline |
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|
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public::set_switch_type |
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public::set_switch |
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public::get_switch |
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public::delete_switch |
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|
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contains |
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|
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subroutine set_switch(rinner, router) |
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|
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real ( kind = dp ), intent(in):: rinner, router |
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real ( kind = dp ), dimension(np) :: xvals, yvals |
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real ( kind = dp ), dimension(2) :: rCubVals, sCubVals |
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real ( kind = dp ) :: rval, rval2, rval3, rval4, rval5 |
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real ( kind = dp ) :: rvaldi, rvaldi2, rvaldi3, rvaldi4, rvaldi5 |
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real ( kind = dp ) :: c0, c3, c4, c5, dx, r, r2 |
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integer :: i |
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|
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if (router .lt. rinner) then |
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call handleError("set_switch", "router is less than rinner") |
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return |
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endif |
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|
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if ((router .lt. 0.0_dp) .or. (rinner .lt. 0.0_dp)) then |
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call handleError("set_switch", "one of the switches is negative!") |
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return |
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endif |
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|
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rin = rinner |
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rout = router |
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rin2 = rinner * rinner |
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rout2 = router * router |
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|
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if ((router-rinner) .lt. 1e-8) then |
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! no reason to set up splines if the switching region is tiny |
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return |
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endif |
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|
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dx = (rout2-rin2) / dble(np-1) |
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|
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do i = 1, np |
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r2 = rin2 + dble(i-1)*dx |
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xvals(i) = r2 |
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yvals(i) = sqrt(r2) |
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enddo |
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|
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call newSpline(r2spline, xvals, yvals, .true.) |
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|
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if (functionType .eq. FIFTH_ORDER_POLY) then |
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c0 = 1.0_dp |
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c3 = -10.0_dp |
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c4 = 15.0_dp |
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c5 = -6.0_dp |
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|
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dx = (rout-rin) / dble(np-1) |
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|
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do i = 1, np |
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r = rin + dble(i-1)*dx |
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xvals(i) = r |
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|
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rval = ( r - rin ) |
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rval2 = rval*rval |
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rval3 = rval2*rval |
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rval4 = rval2*rval2 |
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rval5 = rval3*rval2 |
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rvaldi = 1.0_dp/( rout - rin ) |
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rvaldi2 = rvaldi*rvaldi |
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rvaldi3 = rvaldi2*rvaldi |
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rvaldi4 = rvaldi2*rvaldi2 |
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rvaldi5 = rvaldi3*rvaldi2 |
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yvals(i)= c0 + c3*rval3*rvaldi3 + c4*rval4*rvaldi4 + c5*rval5*rvaldi5 |
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enddo |
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|
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call newSpline(switchSpline, xvals, yvals, .true.) |
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|
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switchIsCubic = .false. |
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else |
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rCubVals(1) = rin |
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rCubVals(2) = rout |
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sCubVals(1) = 1.0_dp |
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sCubVals(2) = 0.0_dp |
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call newSpline(switchSpline, rCubVals, sCubVals, .true.) |
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endif |
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|
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haveSplines = .true. |
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return |
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end subroutine set_switch |
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|
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subroutine set_switch_type(functionForm) |
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integer, intent(in) :: functionForm |
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functionType = functionForm |
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|
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if ((functionType.eq.FIFTH_ORDER_POLY).or.(functionType.eq.CUBIC)) then |
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if (haveSplines) then |
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call delete_switch() |
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call set_switch(rin, rout) |
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endif |
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else |
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call handleError("set_switch_type", & |
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"Unknown type of switching function!") |
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return |
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endif |
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end subroutine set_switch_type |
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|
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subroutine delete_switch() |
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call deleteSpline(switchSpline) |
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call deleteSpline(r2spline) |
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return |
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end subroutine delete_switch |
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|
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subroutine get_switch(r2, sw, dswdr, r, in_switching_region) |
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|
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real( kind = dp ), intent(in) :: r2 |
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real( kind = dp ), intent(inout) :: sw, dswdr, r |
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logical, intent(inout) :: in_switching_region |
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integer :: j |
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real ( kind = dp ) :: a, b, c, d, dx |
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|
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sw = 1.0_dp |
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dswdr = 0.0_dp |
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in_switching_region = .false. |
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|
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if (r2.gt.rin2) then |
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if (r2.gt.rout2) then |
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|
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sw = 0.0_dp |
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dswdr = 0.0_dp |
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return |
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|
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else |
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|
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call lookupUniformSpline(r2Spline, r2, r) |
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if (switchIsCubic) then |
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! super zippy automated use of precomputed spline coefficients |
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dx = r - rin |
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sw = switchSpline%y(1) + dx*(dx*(switchSpline%c(1) + & |
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dx*switchSpline%d(1))) |
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dswdr = dx*(2.0_dp * switchSpline%c(1) + & |
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3.0_dp * dx * switchSpline%d(1)) |
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else |
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call lookupUniformSpline1d(switchSpline, r, sw, dswdr) |
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endif |
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|
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in_switching_region = .true. |
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|
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return |
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endif |
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else |
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return |
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endif |
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|
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end subroutine get_switch |
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|
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end module switcheroo |
