Added a perturbed box test case. The IC is generated by a python script.

Former-commit-id: 8a294ff948a52843b8c5fd56e1ed95baf5934749

examples/PertubedBox/makeIC.py

+###############################################################################
+ # This file is part of SWIFT.
+ # Coypright (c) 2012 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 random
+from numpy import *
+
+# Generates a swift IC file containing a perturbed cartesian distribution of particles
+# at a constant density and pressure in a cubic box
+
+# Parameters
+periodic= 1      # 1 For periodic box
+boxSize = 1.
+L = 50           # Number of particles along one axis
+rho = 1.         # Density
+P = 1.           # Pressure
+gamma = 5./3.    # Gas adiabatic index
+pert = 0.1      # Perturbation scale (in units of the interparticle separation)
+fileName = "perturbedBox.hdf5" 
+
+
+#---------------------------------------------------
+numPart = L**3
+mass = boxSize**3 * rho / numPart
+internalEnergy = P / ((gamma - 1.)*rho)
+
+#Generate particles
+coords = zeros((numPart, 3))
+v      = zeros((numPart, 3))
+m      = zeros((numPart, 1))
+h      = zeros((numPart, 1))
+u      = zeros((numPart, 1))
+ids    = zeros((numPart, 1), dtype='L')
+
+for i in range(L):
+    for j in range(L):
+        for k in range(L):
+            index = i*L*L + j*L + k
+            x = i * boxSize / L + boxSize / (2*L) + random.random() * pert * boxSize/(2.*L)
+            y = j * boxSize / L + boxSize / (2*L) + random.random() * pert * boxSize/(2.*L)
+            z = k * boxSize / L + boxSize / (2*L) + random.random() * pert * boxSize/(2.*L)
+            coords[index,0] = x
+            coords[index,1] = y
+            coords[index,2] = z
+            v[index,0] = 0.
+            v[index,1] = 0.
+            v[index,2] = 0.
+            m[index] = mass
+            h[index] = 1.2 * boxSize / L
+            u[index] = internalEnergy
+            ids[index] = index
+            
+            
+
+#--------------------------------------------------
+
+#File
+file = h5py.File(fileName, 'w')
+
+# Header
+grp = file.create_group("/Header")
+grp.attrs["BoxSize"] = boxSize
+grp.attrs["NumPart_Total"] = numPart
+
+#Runtime parameters
+grp = file.create_group("/RuntimePars")
+grp.attrs["PeriodicBoundariesOn"] = periodic
+
+#Particle group
+grp = file.create_group("/PartType0")
+ds = grp.create_dataset('Coordinates', (numPart, 3), 'd')
+ds[()] = coords
+ds = grp.create_dataset('Velocity', (numPart, 3), 'f')
+ds[()] = v
+ds = grp.create_dataset('Mass', (numPart,1), 'f')
+ds[()] = m
+ds = grp.create_dataset('SmoothingLength', (numPart,1), 'f')
+ds[()] = h
+ds = grp.create_dataset('InternalEnergy', (numPart,1), 'f')
+ds[()] = u
+ds = grp.create_dataset('ParticleIDs', (numPart, 1), 'L')
+ds[()] = ids
+
+file.close()