You can plainly see -if you know what to look for- that momentum pulls the particles outward, but negative pressure pulls them inward; It also plays a part in keeping them going, as the wake of negative pressure left by one particle pulls the next along.
circle
gravity
momentum
chain
Comments
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And you also may want to set it to either blob or persistant display.
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Try setting the simulation pressure settings to: "Pressure off"
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I have done this on a different game, but the principle is still the same, it needs pressure to work.
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I've done this many a time before, nice process of radial gravity