Added 1D interacting blast wave test.

examples/InteractingBlastWaves_1D/interactingBlastWaves.yml

+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1   # Grams
+  UnitLength_in_cgs:   1   # Centimeters
+  UnitVelocity_in_cgs: 1   # Centimeters per second
+  UnitCurrent_in_cgs:  1   # Amperes
+  UnitTemp_in_cgs:     1   # Kelvin
+
+# Parameters governing the time integration
+TimeIntegration:
+  time_begin: 0.    # The starting time of the simulation (in internal units).
+  time_end:   3.8e-2  # The end time of the simulation (in internal units).
+  dt_min:     1e-7  # The minimal time-step size of the simulation (in internal units).
+  dt_max:     1e-5  # The maximal time-step size of the simulation (in internal units).
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            interactingBlastWaves # Common part of the name of output files
+  time_first:          0.    # Time of the first output (in internal units)
+  delta_time:          1e-2  # Time difference between consecutive outputs (in internal units)
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  delta_time:          1e-5 # Time between statistics output
+
+# Parameters for the hydrodynamics scheme
+SPH:
+  resolution_eta:        1.2348   # Target smoothing length in units of the mean inter-particle separation (1.2348 == 48Ngbs with the cubic spline kernel).
+  CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./interactingBlastWaves.hdf5          # The file to read

examples/InteractingBlastWaves_1D/makeIC.py

+###############################################################################
+# This file is part of SWIFT.
+# Copyright (c) 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/>.
+#
+##############################################################################
+
+# Generates a regular 1D grid that contains the Woodward & Colella (1984)
+# interacting blast waves test.
+# Note that the original test requires reflective boundary conditions. Since we
+# do not have those in SWIFT, we double the computational domain and mirror the
+# setup in the second half.
+
+import numpy as np
+import h5py
+
+fileName = "interactingBlastWaves.hdf5"
+numPart = 800
+boxSize = 2.
+
+coords = np.zeros((numPart, 3))
+v = np.zeros((numPart, 3))
+m = np.zeros(numPart) + boxSize / numPart
+h = np.zeros(numPart) + 2. * boxSize / numPart
+u = np.zeros(numPart)
+ids = np.arange(numPart, dtype = 'L')
+rho = np.ones(numPart)
+
+for i in range(numPart):
+  coords[i,0] = (i + 0.5) * boxSize / numPart
+  if coords[i,0] < 0.1 or coords[i,0] > 1.9:
+    u[i] = 2500.
+  elif coords[i,0] > 0.9 and coords[i,0] < 1.1:
+    u[i] = 250.
+  else:
+    u[i] = 0.025
+
+#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
+
+#Runtime parameters
+grp = file.create_group("/RuntimePars")
+grp.attrs["PeriodicBoundariesOn"] = 1
+
+#Units
+grp = file.create_group("/Units")
+grp.attrs["Unit length in cgs (U_L)"] = 1.
+grp.attrs["Unit mass in cgs (U_M)"] = 1.
+grp.attrs["Unit time in cgs (U_t)"] = 1.
+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')
+grp.create_dataset('Density', data=rho, dtype='f')
+
+file.close()

examples/InteractingBlastWaves_1D/plotSolution.py

+###############################################################################
+# This file is part of SWIFT.
+# Copyright (c) 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
+import matplotlib
+matplotlib.use("Agg")
+import pylab as pl
+import sys
+
+snap = int(sys.argv[1])
+
+sim = h5py.File("interactingBlastWaves_%04d.hdf5" % snap, "r")
+coords = sim["/PartType0/Coordinates"]
+rho = sim["/PartType0/Density"]
+
+pl.xlabel("$x$")
+pl.ylabel("$\\rho{}$")
+pl.xlim(0.4, 1.)
+pl.ylim(0., 7.)
+pl.plot(coords[:,0], rho, "k.")
+pl.savefig("InteractingBlastWaves.png")

examples/InteractingBlastWaves_1D/run.sh

+#!/bin/bash
+
+ # Generate the initial conditions if they are not present.
+if [ ! -e interactingBlastWaves.hdf5 ]
+then
+    echo "Generating initial conditions for the Sedov blast example..."
+    python makeIC.py
+fi
+
+# Run SWIFT
+../swift -s -t 1 interactingBlastWaves.yml 2>&1 | tee output.log
+
+# Plot the solution
+python plotSolution.py 4