adding-a-cooling-routine-to-swift.md

-so now I've built SWIFT and tested it with some of the examples scripts.
+#Created cooling.c and cooling.h
 
-Can we new include hydroparticles? yes - Tom's already got an example.
+Followed example of external potentials. Struct contains cooling data, have a function which reads
+parameters into the struct. 
 
-cp -r /gpfs/data/tt/Codes/Swift-git/swiftsim.July21/examples/IsothermalPotential//HydroStatic/ .
+Wrote function which takes the 'old particle data', the cooling data, and a timestep as arguments, and returns a new internal energy. This function would have to be different depending on the cooling model used. For now we just have a constant cooling rate for all particles.
 
-and try it :)  compare to rgb's attempt
+Another functions takes the 'new internal energy' and updates the entropy.
 
-/gpfs/data/rgb/Swift/swiftsim/examples/IsothermalPotential/HydroStatic
+#Added the function runner_do_cooling to runner.c
 
-Stefan:
+Followed the 'external potentials' example. Calls the 'update entropy' unction for a particle when it is active
 
-GravityOnly works fine
-
-Trying Tom's example:
-
-Need to add timestep_mult to the yml file (set to be 0.03 in the GravityOnly example)
-
-Need to add Statistics:delta_time
-
-Got a segmentation fault when I ran it.
-
-Trying Richard's example:
-
-Seems to run fine
+#Added cooling to the engine
 
+Added'engine_policy_cooling' to the list of engine policies. 
+Added a 'cooling task' to the cell struct
+The cooling task is unlocked after the kick is performed. It does not unlock anything
 
+#Added a 'C' flag option.
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