Commit c4a2c17e authored by Matthieu Schaller's avatar Matthieu Schaller
Browse files

New script to generate uniform DM box ICs

parent 216b1710
###############################################################################
# This file is part of SWIFT.
# Copyright (c) 2013 Pedro Gonnet (pedro.gonnet@durham.ac.uk),
# Matthieu Schaller (matthieu.schaller@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 <http://www.gnu.org/licenses/>.
#
##############################################################################
import h5py
import sys
from numpy import *
# Generates a swift IC file containing a cartesian distribution of DM particles
# with a density of 1
# Parameters
periodic= 1 # 1 For periodic box
boxSize = 1.
rho = 1.
L = int(sys.argv[1]) # Number of particles along one axis
fileName = "uniformDMBox_%d.hdf5"%L
#---------------------------------------------------
numPart = L**3
mass = boxSize**3 * rho / numPart
#--------------------------------------------------
#File
file = h5py.File(fileName, 'w')
# Header
grp = file.create_group("/Header")
grp.attrs["BoxSize"] = boxSize
grp.attrs["NumPart_Total"] = [0, numPart, 0, 0, 0, 0]
grp.attrs["NumPart_Total_HighWord"] = [0, 0, 0, 0, 0, 0]
grp.attrs["NumPart_ThisFile"] = [0, numPart, 0, 0, 0, 0]
grp.attrs["Time"] = 0.0
grp.attrs["NumFilesPerSnapshot"] = 1
grp.attrs["MassTable"] = [0.0, mass, 0.0, 0.0, 0.0, 0.0]
grp.attrs["Flag_Entropy_ICs"] = 0
#Runtime parameters
grp = file.create_group("/RuntimePars")
grp.attrs["PeriodicBoundariesOn"] = periodic
#Particle group
grp = file.create_group("/PartType1")
v = zeros((numPart, 3))
ds = grp.create_dataset('Velocities', (numPart, 3), 'f')
ds[()] = v
v = zeros(1)
m = full((numPart, 1), mass)
ds = grp.create_dataset('Masses', (numPart,1), 'f')
ds[()] = m
m = zeros(1)
ids = linspace(0, numPart, numPart, endpoint=False).reshape((numPart,1))
ds = grp.create_dataset('ParticleIDs', (numPart, 1), 'L')
ds[()] = ids
x = ids % L;
y = ((ids - x) / L) % L;
z = (ids - x - L * y) / L**2;
coords = zeros((numPart, 3))
coords[:,0] = z[:,0] * boxSize / L + boxSize / (2*L)
coords[:,1] = y[:,0] * boxSize / L + boxSize / (2*L)
coords[:,2] = x[:,0] * boxSize / L + boxSize / (2*L)
ds = grp.create_dataset('Coordinates', (numPart, 3), 'd')
ds[()] = coords
file.close()
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