Added a lower resolution Santa Barbara test case. This one is 128^3 particles...

Added a lower resolution Santa Barbara test case. This one is 128^3 particles and runs in 4 hours on cosma-7.

examples/Makefile.am

@@ -84,7 +84,8 @@ EXTRA_DIST = CoolingBox/coolingBox.yml CoolingBox/energy_plot.py CoolingBox/make
 	     PerturbedBox_3D/makeIC.py PerturbedBox_3D/perturbedBox.yml PerturbedBox_3D/run.sh \
 	     PMillennium-384/p-mill-384.yml \
 	     PMillennium-768/p-mill-768.yml \
-	     SantaBarbara/README SantaBarbara/getIC.sh SantaBarbara/santa_barbara.yml \
+	     SantaBarbara/README SantaBarbara/getIC.sh SantaBarbara/santa_barbara.yml SantaBarbara/run.sh \
+	     SantaBarbara_low/README SantaBarbara_low/getIC.sh SantaBarbara_low/santa_barbara.yml SantaBarbara_low/run.sh \
 	     SedovBlast_1D/makeIC.py SedovBlast_1D/plotSolution.py SedovBlast_1D/run.sh SedovBlast_1D/sedov.yml \
 	     SedovBlast_2D/getGlass.sh SedovBlast_2D/makeIC.py SedovBlast_2D/plotSolution.py SedovBlast_2D/run.sh SedovBlast_2D/sedov.yml \
 	     SedovBlast_3D/getGlass.sh SedovBlast_3D/makeIC.py SedovBlast_3D/plotSolution.py SedovBlast_3D/run.sh SedovBlast_3D/sedov.yml \

examples/SantaBarbara_low/README

+Initital conditions for the Santa-Barbara cluster comparison project.
+These have been regenerated from the orinigal Frenk et al. 1999 paper.
+
+The cosmology is Omega_m = 1, Omega_b = 0.1, h = 0.5 and sigma_8 = 0.9.
+
+The ICs are 128^3 particles in a 64^3 Mpc^3 volume. This is about 10x
+higher resolution than in the original paper. The ICs have been
+created for Gadget and the positions and box size are hence expressed
+in h-full units (e.g. box size of 32 / h Mpc). Similarly, the peculiar
+velocitites contain an extra sqrt(a) factor. 
+
+We will use SWIFT to cancel the h- and a-factors from the ICs. Gas
+particles will be generated at startup.
+
+MD5 check-sum of the ICS:
+1a1600b41002789b6057b1fa6333f3f0  SantaBarbara_128.hdf5
+
+You can use the script run_velociraptor.sh to also run a basic 3D FoF
+with VELOCIraptor on your output data. You will need to set the
+VELOCIRAPTOR_PATH environment variable to tell us where the stf-gas
+binary lives.

examples/SantaBarbara_low/getIC.sh

+#!/bin/bash
+wget http://virgodb.cosma.dur.ac.uk/swift-webstorage/ICs/SantaBarbara_128.hdf5

examples/SantaBarbara_low/run.sh

+#!/bin/bash
+# Run SWIFT
+../swift -c -s -G -t 28 santa_barbara.yml
+

examples/SantaBarbara_low/santa_barbara.yml

+# Define the system of units to use internally. 
+InternalUnitSystem:
+  UnitMass_in_cgs:     1.98848e43    # 10^10 M_sun in grams
+  UnitLength_in_cgs:   3.08567758e24 # Mpc in centimeters
+  UnitVelocity_in_cgs: 1e5           # 1 km/s 
+  UnitCurrent_in_cgs:  1             # Amperes
+  UnitTemp_in_cgs:     1             # Kelvin
+
+# Cosmological parameters
+Cosmology:
+  h:              0.5        
+  a_begin:        0.047619048        # z_ini = 20
+  a_end:          1.0                # z_end = 0
+  Omega_m:        1.0        
+  Omega_lambda:   0.0        
+  Omega_b:        0.1        
+  
+# Parameters governing the time integration
+TimeIntegration:
+  dt_max:     0.01
+  dt_min:     1e-10
+
+Scheduler:
+  max_top_level_cells: 16
+  cell_split_size:     100
+
+# Parameters governing the snapshots
+Snapshots:
+  basename:            santabarbara_low
+  scale_factor_first:  0.05
+  delta_time:          1.02
+
+# Parameters governing the conserved quantities statistics
+Statistics:
+  delta_time:           1.02
+  scale_factor_first:   0.05
+
+# Parameters for the self-gravity scheme
+Gravity:
+  eta:                    0.025  
+  theta:                  0.5
+  comoving_softening:     0.02    # 20 kpc = 1/25 mean inter-particle separation
+  max_physical_softening: 0.00526 # 20 ckpc = 5.26 pkpc at z=2.8 (EAGLE-like evolution of softening).
+  mesh_side_length:       64
+
+# Parameters of the hydro scheme
+SPH:
+  resolution_eta:      1.2348   # "48 Ngb" with the cubic spline kernel
+  CFL_condition:       0.1
+  initial_temperature: 1200.    # (1 + z_ini)^2 * 2.72K
+  minimal_temperature: 100.
+
+# Parameters related to the initial conditions
+InitialConditions:
+  file_name:  ./SantaBarbara_128.hdf5
+  periodic:   1
+  cleanup_h_factors: 1              # ICs were generated for Gadget, we need to get rid of h-factors
+  cleanup_velocity_factors: 1       # ICs were generated for Gadget, we need to get rid of sqrt(a) factors in the velocity
+  generate_gas_in_ics: 1            # Generate gas particles from the DM-only ICs
+  cleanup_smoothing_lengths: 1      # Since we generate gas, make use of the (expensive) cleaning-up procedure.
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