Thank you all! Your replies were all helpful.

I needed just a simple approximation, nothing complicated. And what I need
to simulate it on is not really objects, but different kinds of particles
such as smoke, water drops, sparks and other things a particle system could
be used for.

I suppose that doesn't change anything; the basic drag formula should still
work the same, right? It's just a matter of finding the right drag
coefficient, drag constant or whatever you want to call it.

Rune
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