############################################################################### # This file is part of SWIFT. # Copyright (c) 2016 Matthieu Schaller (schaller@strw.leidenuniv.nl) # # 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 numpy as np # Generates a swift IC file for the Smoothed Metallicity test # in a periodic cubic box # Parameters gamma = 5.0 / 3.0 # Gas adiabatic index rho0 = 1.0 # Background density P0 = 1e-6 # Background pressure Nelem = 10 # Gear: 10, EAGLE: 9 low_metal = -6 # Low iron fraction high_metal = -5.5 # high iron fraction max_shift = 1 # Shift between the different elements sigma_metal = 0.2 # relative standard deviation for the metallicities fileName = "smoothed_metallicity.hdf5" # shift all metals in order to obtain nicer plots low_metal = [low_metal] * Nelem + np.linspace(0, max_shift, Nelem) low_metal = 10 ** low_metal high_metal = [high_metal] * Nelem + np.linspace(0, max_shift, Nelem) high_metal = 10 ** high_metal # --------------------------------------------------- glass = h5py.File("glassCube_32.hdf5", "r") # Read particle positions and h from the glass pos = glass["/PartType0/Coordinates"][:, :] h = glass["/PartType0/SmoothingLength"][:] numPart = np.size(h) vol = 1.0 # Generate extra arrays v = np.zeros((numPart, 3)) ids = np.linspace(1, numPart, numPart) m = np.zeros(numPart) u = np.zeros(numPart) r = np.zeros(numPart) mass_frac = np.zeros((numPart, Nelem)) m[:] = rho0 * vol / numPart u[:] = P0 / (rho0 * (gamma - 1)) # set metallicities select = pos[:, 0] < 0.5 nber = sum(select) mass_frac[select, :] = low_metal * ( 1 + np.random.normal(loc=0.0, scale=sigma_metal, size=(nber, Nelem)) ) nber = numPart - nber mass_frac[~select, :] = high_metal * ( 1 + np.random.normal(loc=0.0, scale=sigma_metal, size=(nber, Nelem)) ) v[select, 2] = 1 v[~select, 2] = -1 # -------------------------------------------------- # File file = h5py.File(fileName, "w") # Header grp = file.create_group("/Header") grp.attrs["BoxSize"] = [1.0, 1.0, 1.0] 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"] = 3 # Units grp = file.create_group("/Units") grp.attrs["Unit length in cgs (U_L)"] = 1.0 grp.attrs["Unit mass in cgs (U_M)"] = 1.0 grp.attrs["Unit time in cgs (U_t)"] = 1.0 grp.attrs["Unit current in cgs (U_I)"] = 1.0 grp.attrs["Unit temperature in cgs (U_T)"] = 1.0 # Particle group grp = file.create_group("/PartType0") grp.create_dataset("Coordinates", data=pos, 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") grp.create_dataset("MetalMassFraction", data=mass_frac, dtype="d") grp.create_dataset("ElementAbundance", data=mass_frac, dtype="d") file.close()