Category Archives: Simulation

Barnes-Hut for N-body force calculations

Seen on Reddit a couple of days ago, a nicely presented article on the Barnes-Hut algorithm. Advertisements

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Cloth simulation circa 2009

Another salvaged artefact: an old animation of a rectangular cloth draped over an invisible donut-shaped table.

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Fire simulation with FDS

Last November I downloaded something called Fire Dynamics Simulator, which is made by NIST (the US government’s National Institute of Standards and Technology).  If there’s one thing I admire about the United States government, it’s that it actually does useful … Continue reading

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Galaxy animation from 2010

I’ve been rewriting a gravity simulator (see my earlier posts on ephemerides and relativity).  This isn’t because I’ve thought of a better design or come upon a better technology for it.  It’s because I lost the first version!  I’ve recovered … Continue reading

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Faking relativity

As you know, the orbit of Mercury about the Sun cannot be explained entirely by Newtonian physics. In an ideal Newtonian system, the orbit of a small body around a larger one is a stationary ellipse. In the case of … Continue reading

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Ephemerides from JPL Horizons

Ephemeris is a strange word that evokes both scientific and mystical ideas.

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