Universe Sandbox
Universe Sandbox Legacy => Universe Sandbox Legacy | Discussion => Topic started by: phasma_phasmatis on May 02, 2011, 03:34:09 PM
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Does Universe Sandbox 2 simulate it?
If so, how?
Also, how hard would it be for an average computer to simulate gravitational lensing? If it could be implemented without the need for a high-end computer, that would be really cool.
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Nope... No dark matter. Try placing a galaxy, and let it run. You'll notice it'll spiral way too much.
Microlensing: It's just bending light... It'd have to calculate gravity on light... That might take a good computer.
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Aw. Maybe in a couple years when computers are more powerful it would be possible.
Anyway, when I run a milky way sim, and the time step is relatively small, the spirals seem stable.
It's only when the time step gets inaccurate that the spiral starting to fling out.
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I think you're just not being patient. :P
Seriously, you're probably not going the same amount of simulation time (even though it may seem like it) as on the higher timestep. :)
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I just tested it. From what i'm seeing, the spirals are stable.
Whenever I increase the time step, the spirals do change shape, once i stop changing the time step, they stop changing shape and remain stable.
Whats happening is that when the time step increases, the calculations for the dust particles with a smaller SMA becomes too inaccurate and they fly off. The higher the time step, the bigger the SMA of instability.
I think the dust particles do not have real world velocity and the sim is setting the particles to auto-orbit (at a fictional velocity).