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Added co-moving Sod shock test.

Merged Bert Vandenbroucke requested to merge cosmo_sod into master
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###############################################################################
 
# This file is part of SWIFT.
 
# Copyright (c) 2016 Matthieu Schaller (matthieu.schaller@durham.ac.uk)
 
# 2018 Bert Vandenbroucke (bert.vandenbroucke@gmail.com)
 
#
 
# 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
 
from numpy import *
 
 
# Generates a swift IC file for the 1D Sod Shock in a periodic box
 
 
unit_l_in_cgs = 3.086e18
 
unit_m_in_cgs = 2.94e55
 
unit_t_in_cgs = 3.086e18
 
 
# Parameters
 
gamma = 5./3. # Gas adiabatic index
 
numPart_L = 800 # Number of particles in the left state
 
x_min = -1.
 
x_max = 1.
 
rho_L = 1. # Density left state
 
rho_R = 0.125 # Density right state
 
v_L = 0. # Velocity left state
 
v_R = 0. # Velocity right state
 
P_L = 1. # Pressure left state
 
P_R = 0.1 # Pressure right state
 
a_beg = 0.001
 
fileName = "sodShock.hdf5"
 
 
 
#---------------------------------------------------
 
 
# Find how many particles we actually have
 
boxSize = x_max - x_min
 
numPart_R = int(numPart_L * (rho_R / rho_L))
 
numPart = numPart_L + numPart_R
 
 
# Now get the distances
 
delta_L = (boxSize/2) / numPart_L
 
delta_R = (boxSize/2) / numPart_R
 
offset_L = delta_L / 2
 
offset_R = delta_R / 2
 
 
# Build the arrays
 
coords = zeros((numPart, 3))
 
v = zeros((numPart, 3))
 
ids = linspace(1, numPart, numPart)
 
m = zeros(numPart)
 
h = zeros(numPart)
 
u = zeros(numPart)
 
 
# Set the particles on the left
 
for i in range(numPart_L):
 
coords[i,0] = x_min + offset_L + i * delta_L
 
u[i] = P_L / (rho_L * (gamma - 1.))
 
h[i] = 1.2348 * delta_L
 
m[i] = boxSize * rho_L / (2. * numPart_L)
 
v[i,0] = v_L
 
 
# Set the particles on the right
 
for j in range(numPart_R):
 
i = numPart_L + j
 
coords[i,0] = offset_R + j * delta_R
 
u[i] = P_R / (rho_R * (gamma - 1.))
 
h[i] = 1.2348 * delta_R
 
m[i] = boxSize * rho_R / (2. * numPart_R)
 
v[i,0] = v_R
 
 
# Shift particles
 
coords[:,0] -= x_min
 
 
u /= (a_beg**(3. * (gamma - 1.)))
 
 
#File
 
file = h5py.File(fileName, 'w')
 
 
# Header
 
grp = file.create_group("/Header")
 
grp.attrs["BoxSize"] = boxSize
 
grp.attrs["NumPart_Total"] = [numPart, 0, 0, 0, 0, 0]
 
grp.attrs["NumPart_Total_HighWord"] = [0, 0, 0, 0, 0, 0]
 
grp.attrs["NumPart_ThisFile"] = [numPart, 0, 0, 0, 0, 0]
 
grp.attrs["Time"] = 0.0
 
grp.attrs["NumFilesPerSnapshot"] = 1
 
grp.attrs["MassTable"] = [0.0, 0.0, 0.0, 0.0, 0.0, 0.0]
 
grp.attrs["Flag_Entropy_ICs"] = 0
 
grp.attrs["Dimension"] = 1
 
 
#Units
 
grp = file.create_group("/Units")
 
grp.attrs["Unit length in cgs (U_L)"] = unit_l_in_cgs
 
grp.attrs["Unit mass in cgs (U_M)"] = unit_m_in_cgs
 
grp.attrs["Unit time in cgs (U_t)"] = unit_t_in_cgs
 
grp.attrs["Unit current in cgs (U_I)"] = 1.
 
grp.attrs["Unit temperature in cgs (U_T)"] = 1.
 
 
#Particle group
 
grp = file.create_group("/PartType0")
 
grp.create_dataset('Coordinates', data=coords, dtype='d')
 
grp.create_dataset('Velocities', data=v, dtype='f')
 
grp.create_dataset('Masses', data=m, dtype='f')
 
grp.create_dataset('SmoothingLength', data=h, dtype='f')
 
grp.create_dataset('InternalEnergy', data=u, dtype='f')
 
grp.create_dataset('ParticleIDs', data=ids, dtype='L')
 
 
 
file.close()
 
 
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