[Here I began a simulation project investigating the effects of tidal encounters on disc galaxies. As this one used particle data from an SPH code, rather than the FLASH grid code as before, I had to begin from scratch with my efforts to create a stable disc. Little did I realise what I was getting myself in for...]
Some more fun with galaxy simulations. This one is of a cold, slowly expanding disc of gas made of 10,000 particles. The lines show the trajectory of each particle.
Because the disc is cold, parts of it tend to collapse even as the whole thing expands. Since the disc is given a solid body rotation, different parts of the disc are moving outwards at different speeds. The escape velocity at any point changes over time as it expands. The result isn't particularly interesting, but it is nice to look at.
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