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#! /usr/bin/env python |
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|
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"""Quadrupolar Lattice Builder |
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|
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Creates cubic lattices of quadrupoles to test the |
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quadrupole-quadrupole interaction code. |
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|
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Usage: buildQuadrupolarArray |
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|
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Options: |
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-h, --help show this help |
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-x, --array-type-X use one of the basic "X" arrays |
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-y, --array-type-Y use one of the basic "Y" arrays |
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-z, --array-type-Z use one of the basic "Z" arrays |
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-l, --lattice=... use the specified lattice ( SC, FCC, or BCC ) |
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-c, --constant=... use the specified lattice constant |
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-n use the specified number of unit cells |
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-o, --output-file=... use specified output (.xyz) file |
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|
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Type "A" arrays have nearest neighbor strings of antiparallel dipoles. |
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|
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Type "B" arrays have nearest neighbor strings of antiparallel dipoles |
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if the dipoles are contained in a plane perpendicular to the dipole |
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direction that passes through the dipole. |
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|
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Example: |
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buildQuadrupolarArray -l fcc -c 5 -n 3 -o FCC.md |
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|
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""" |
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|
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__author__ = "Dan Gezelter (gezelter@nd.edu)" |
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__version__ = "$Rev: 1914 $" |
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__date__ = "$LastChangedDate: 2013-07-29 11:34:04 -0400 (Mon, 29 Jul 2013) $" |
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|
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__copyright__ = "Copyright (c) 2013 by the University of Notre Dame" |
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__license__ = "OpenMD" |
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|
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import sys |
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import getopt |
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import string |
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import math |
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import numpy |
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|
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def usage(): |
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print __doc__ |
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|
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def createLattice(latticeType, latticeNumber, latticeConstant, arrayType, outputFileName): |
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# The following section creates 24 basic arrays from Luttinger and |
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# Tisza: |
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|
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# The six unit vectors are: 3 spatial and 3 to describe the |
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# orientation of the dipole. |
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|
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e1 = numpy.array([1.0,0.0,0.0]) |
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e2 = numpy.array([0.0,1.0,0.0]) |
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e3 = numpy.array([0.0,0.0,1.0]) |
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|
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# Parameters describing the 8 basic arrays: |
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cell = numpy.array([[0,0,0],[0,0,1],[1,0,0],[0,1,0], |
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[1,1,0],[0,1,1],[1,0,1],[1,1,1]]) |
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# order in which the basic arrays are constructed in the l loops below: |
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corners = numpy.array([[0,0,0],[0,0,1],[0,1,0],[0,1,1], |
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[1,0,0],[1,0,1],[1,1,0],[1,1,1]]) |
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|
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X = numpy.zeros(192).reshape((8,8,3)) |
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Y = numpy.zeros(192).reshape((8,8,3)) |
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Z = numpy.zeros(192).reshape((8,8,3)) |
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|
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# create the 24 basic arrays using Eq. 12 in Luttinger & Tisza: |
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for i in range(8): |
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which = 0 |
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for l1 in range(2): |
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for l2 in range(2): |
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for l3 in range(2): |
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lvals = numpy.array([l1,l2,l3]) |
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value = math.pow(-1, numpy.dot(cell[i], lvals)) |
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X[i][which] = value * e1 |
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Y[i][which] = value * e2 |
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Z[i][which] = value * e3 |
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which = which+1 |
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|
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|
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lp_array = numpy.zeros(0).reshape((0,3)) |
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for i in range(8): |
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lp_array = numpy.vstack((lp_array, corners[i])) |
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|
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bc_array = numpy.zeros(0).reshape((0,3)) |
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for i in range(8): |
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bc_array = numpy.vstack((bc_array, corners[i] + [0.5,0.5,0.5])) |
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|
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xy_array = numpy.zeros(0).reshape((0,3)) |
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for i in range(8): |
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xy_array = numpy.vstack((xy_array, corners[i] + [0.5,0.5,0.0])) |
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|
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xz_array = numpy.zeros(0).reshape((0,3)) |
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for i in range(8): |
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xz_array = numpy.vstack((xz_array, corners[i] + [0.5,0.0,0.5])) |
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|
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yz_array = numpy.zeros(0).reshape((0,3)) |
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for i in range(8): |
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yz_array = numpy.vstack((yz_array, corners[i] + [0.0,0.5,0.5])) |
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|
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known_case = False |
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basic_array = numpy.zeros(0).reshape((0,3,3)) |
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|
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lp_part = numpy.zeros(0).reshape((0,3,3)) |
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bc_part = numpy.zeros(0).reshape((0,3,3)) |
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xy_part = numpy.zeros(0).reshape((0,3,3)) |
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xz_part = numpy.zeros(0).reshape((0,3,3)) |
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yz_part = numpy.zeros(0).reshape((0,3,3)) |
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|
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if (arrayType == 'X'): |
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if (int(latticeType)): |
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which = int(latticeType) - 1 |
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basic_array = numpy.append(lp_array, X[which], axis=1) |
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known_case = True |
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if (arrayType == 'Y'): |
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if (int(latticeType)): |
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which = int(latticeType) - 1 |
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basic_array = numpy.append(lp_array, Y[which], axis=1) |
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known_case = True |
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if (arrayType == 'Z'): |
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if (int(latticeType)): |
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which = int(latticeType) - 1 |
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basic_array = numpy.append(lp_array, Z[which], axis=1) |
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known_case = True |
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if (latticeType.lower() == 'sc'): |
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lp_part = numpy.append(lp_array, X[0]+Y[0]+Z[0], axis=1) |
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basic_array = lp_part |
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known_case = True |
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if (latticeType.lower() == 'bcc'): |
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lp_part = numpy.append(lp_array, X[0]+Y[0], axis=1) |
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bc_part = numpy.append(bc_array, X[0]-Y[0], axis=1) |
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basic_array = numpy.append(lp_part, bc_part, axis=0) |
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known_case = True |
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if (latticeType.lower() == 'fcc'): |
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lp_part = numpy.append(lp_array, X[0]+Y[0]+Z[0], axis=1) |
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xy_part = numpy.append(xy_array, X[0]-Y[0]-Z[0], axis=1) |
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xz_part = numpy.append(xz_array, -X[0]-Y[0]+Z[0], axis=1) |
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yz_part = numpy.append(yz_array, -X[0]+Y[0]-Z[0], axis=1) |
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basic_array = numpy.append(lp_part, xy_part, axis=0) |
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basic_array = numpy.append(basic_array, xz_part, axis=0) |
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basic_array = numpy.append(basic_array, yz_part, axis=0) |
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|
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known_case = True |
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|
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|
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if (not known_case): |
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print "unhandled combination of lattice and dipole direction" |
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print __doc__ |
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|
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bravais_lattice = numpy.zeros(0).reshape((0,6)) |
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for i in range(latticeNumber): |
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for j in range(latticeNumber): |
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for k in range(latticeNumber): |
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for l in range(len(basic_array)): |
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lat_vec = numpy.array([[2*i, 2*j, 2*k, 0.0, 0.0, 0.0]]) |
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bravais_lattice = numpy.append(bravais_lattice, lat_vec + basic_array[l], axis=0) |
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|
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outputFile = open(outputFileName, 'w') |
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|
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outputFile.write('<OpenMD version=2>\n') |
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outputFile.write(' <MetaData>\n') |
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outputFile.write(' molecule{\n') |
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outputFile.write(' name = \"Q\";\n') |
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outputFile.write(' \n') |
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outputFile.write(' atom[0]{\n') |
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outputFile.write(' type = \"Q\";\n') |
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outputFile.write(' position(0.0, 0.0, 0.0);\n') |
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outputFile.write(' orientation(0.0, 0.0, 0.0);\n') |
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outputFile.write(' }\n') |
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outputFile.write(' }\n') |
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outputFile.write(' component{\n') |
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outputFile.write(' type = \"Q\";\n') |
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outputFile.write(' nMol = '+ repr(len(bravais_lattice)) + ';\n') |
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outputFile.write(' }\n') |
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|
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outputFile.write(' ensemble = NVE;\n') |
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outputFile.write(' forceField = \"Multipole\";\n') |
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|
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outputFile.write(' cutoffMethod = \"shifted_force\";\n') |
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outputFile.write(' electrostaticScreeningMethod = \"damped\";\n') |
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|
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outputFile.write(' cutoffRadius = 9.0;\n') |
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outputFile.write(' dampingAlpha = 0.18;\n') |
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outputFile.write(' statFileFormat = \"TIME|TOTAL_ENERGY|POTENTIAL_ENERGY|KINETIC_ENERGY|TEMPERATURE|PRESSURE|VOLUME|CONSERVED_QUANTITY|ELECTROSTATIC_POTENTIAL\";\n') |
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outputFile.write(' dt = 1.0;\n') |
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outputFile.write(' runTime = 1.0;\n') |
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outputFile.write(' sampleTime = 1.0;\n') |
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outputFile.write(' statusTime = 1.0;\n') |
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outputFile.write(' </MetaData>\n') |
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outputFile.write(' <Snapshot>\n') |
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outputFile.write(' <FrameData>\n'); |
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outputFile.write(" Time: %.10g\n" % (0.0)) |
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|
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Hxx = 2.0 * latticeConstant * latticeNumber |
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Hyy = 2.0 * latticeConstant * latticeNumber |
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Hzz = 2.0 * latticeConstant * latticeNumber |
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|
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outputFile.write(' Hmat: {{%d, 0, 0}, {0, %d, 0}, {0, 0, %d}}\n' % (Hxx, Hyy, Hzz)) |
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outputFile.write(' </FrameData>\n') |
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outputFile.write(' <StuntDoubles>\n') |
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sdFormat = 'pvqj' |
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index = 0 |
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|
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for i in range(len(bravais_lattice)): |
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xcart = latticeConstant*(bravais_lattice[i][0]) |
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ycart = latticeConstant*(bravais_lattice[i][1]) |
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zcart = latticeConstant*(bravais_lattice[i][2]) |
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dx = bravais_lattice[i][3] |
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dy = bravais_lattice[i][4] |
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dz = bravais_lattice[i][5] |
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|
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dlen = math.sqrt(dx*dx + dy*dy + dz*dz) |
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ctheta = dz / dlen |
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theta = math.acos(ctheta) |
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stheta = math.sqrt(1.0 - ctheta*ctheta) |
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psi = 0.0 |
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phi = math.atan2(dx/dlen, -dy/dlen) |
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|
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q = [0.0,0.0,0.0,0.0] |
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q[0] = math.cos(theta/2)*math.cos((phi+psi)/2) |
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q[1] = math.sin(theta/2)*math.cos((phi-psi)/2) |
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q[2] = math.sin(theta/2)*math.sin((phi-psi)/2) |
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q[3] = math.cos(theta/2)*math.sin((phi+psi)/2) |
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|
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qlen = math.sqrt(q[0]*q[0] + q[1]*q[1] + q[2]*q[2] + q[3]*q[3]) |
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q[0] = q[0]/qlen |
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q[1] = q[1]/qlen |
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q[2] = q[2]/qlen |
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q[3] = q[3]/qlen |
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|
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outputFile.write("%10d %7s %g %g %1g %g %g %g %13e %13e %13e %13e %g %g %g\n" % (index, sdFormat, xcart, ycart, zcart, 0.0, 0.0, 0.0, q[0], q[1], q[2], q[3], 0.0, 0.0, 0.0)) |
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index = index+1 |
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|
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outputFile.write(" </StuntDoubles>\n") |
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outputFile.write(" </Snapshot>\n") |
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outputFile.write("</OpenMD>\n") |
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outputFile.close() |
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|
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outputFile.close() |
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|
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def main(argv): |
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|
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arrayType = "A" |
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haveOutputFileName = False |
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latticeType = "fcc" |
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latticeNumber = 3 |
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latticeConstant = 4 |
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try: |
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opts, args = getopt.getopt(argv, "hxyzl:c:n:o:", ["help","array-type-X", "array-type-Y", "array-type-Z", "lattice=", "constant=", "output-file="]) |
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except getopt.GetoptError: |
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usage() |
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sys.exit(2) |
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for opt, arg in opts: |
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if opt in ("-h", "--help"): |
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usage() |
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sys.exit() |
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elif opt in ("-x", "--array-type-X"): |
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arrayType = "X" |
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elif opt in ("-y", "--array-type-Y"): |
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arrayType = "Y" |
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elif opt in ("-z", "--array-type-Z"): |
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arrayType = "Z" |
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elif opt in ("-l", "--lattice"): |
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latticeType = arg |
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elif opt in ("-c", "--constant"): |
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latticeConstant = float(arg) |
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elif opt in ("-n"): |
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latticeNumber = int(arg) |
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elif opt in ("-o", "--output-file"): |
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outputFileName = arg |
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haveOutputFileName = True |
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if (not haveOutputFileName): |
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usage() |
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print "No output file was specified" |
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sys.exit() |
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|
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createLattice(latticeType, latticeNumber, latticeConstant, arrayType, outputFileName); |
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|
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if __name__ == "__main__": |
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if len(sys.argv) == 1: |
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usage() |
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sys.exit() |
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main(sys.argv[1:]) |
