makeIC.py 5.38 KB
 Tom Theuns committed Aug 08, 2016 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ############################################################################### # This file is part of SWIFT. # Copyright (c) 2016 John A. Regan (john.a.regan@durham.ac.uk) # Tom Theuns (tom.theuns@durham.ac.uk) # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU Lesser General Public License as published # by the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU Lesser General Public License # along with this program. If not, see . # ############################################################################## import h5py import sys import numpy import math import random # Generates N particles in a box of [0:BoxSize,0:BoxSize,-2scale_height:2scale_height] # see Creasey, Theuns & Bower, 2013, for the equations:  29 # disc parameters are: surface density sigma  Tom Theuns committed Aug 08, 2016 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 # scale height b # density: rho(z) = (sigma/2b) sech^2(z/b) # isothermal velocity dispersion = 0.5 r[random,2] *= -1 r[:,2] += 0.5 * boxSize #generate particle velocities v = numpy.zeros((numPart, 3)) v = numpy.zeros(1) #v[:,2] = ds = grp1.create_dataset('Velocities', (numPart, 3), 'f') ds[()] = v m = numpy.ones((numPart, ), dtype=numpy.float32) * mass ds = grp1.create_dataset('Masses', (numPart,), 'f') ds[()] = m m = numpy.zeros(1) ids = 1 + numpy.linspace(0, numPart, numPart, endpoint=False, dtype='L') ds = grp1.create_dataset('ParticleIDs', (numPart, ), 'L') ds[()] = ids ds = grp1.create_dataset('Coordinates', (numPart, 3), 'd') ds[()] = r file.close()