Bubbling up some ideas
Last night, one thought plopped one after another in my mind, and one of them was about adding local space anomalies which reverse the force applied through gravity. They're literally static bubbles : They are spherical, don't move relative to the world nor grow or shrink over any meaningful time. Their size ranges from as little as 20cm to 30m in radius, although most are around 1 to 4m in radius.
Because I lack complex physics knowledge and because I want simple things, the way I imagine they work is to simply add a coefficient to the Newtonian gravity equation. This coefficient ranges from 1 (outside the bubble, normal gravity) to -1 (at the bubble's center, reversed gravity). There is a smooth, linear gradation at the borders which roughly goes to 0 after 15-20cm inside the bubble and -1 at double the distance, so ~40cm. The borders' size are not relative to the bubble's own size.
A rough 2D cut of the bubble's force field, where white is reversed-gravity and black is normal gravity. Grey is anything in-between.
So what can you expect from this?
The basics :
- Objects outside fall normally (quite obviously).
- Objects fully inside "fall" reverse to local gravity. They go "up" towards the sky and not the ground.
For objects "left" on the borders (ie. dropped without giving force) :
- They fall towards the ground at lower forces (and so speed) in the first 20cm inside the bubble
- At roughly 20cm they don't receive any force.
- Between 20cm and 40cm roughly they fall reverse to local gravity at lower forces.
- For bubbles less than 40cm in radius you never reach full reverse gravity, and for the really few ones at 20 cm it's just at most a no-gravity zone.
The movement of anything solid inside the bubble is quite easy to figure out (I could actually make a simulation of it like I did there) : Things inside move "up", things outside move "down". The weirdest thing that could happen is at the borders, where -as far as my thinking can go- objects left not exactly on the bubble's top will tend to spin along the round surface, as the forces are not uniformly spread on the volume. Think like you slide a cylinder between your fingers, sort of.
That is, everything above is conceptualized in a vacuum environment, as I happen to also have vacuum in my fluid dynamics lessons. If you left a tennis ball here or there, it would probably be affected by air currents too and move another way. That is, if there are any airflows o_x.
So I wish to know what would happen to air inside and in direct proximity to these bubbles? Would air currents be created spontaneously, and if so, what direction would they take and what speed would they roughly have?
In other words, should I expect some fresh cool winds or stormy, very strong ones, if at all? Would they go upward then downward around the bubble, or maybe something else? Would this affect only large sized-bubbles? This is the kind of thing I'm currently wondering about.
I'm aiming this for a classic Earth-like world. I'd like first and foremost to know what would happen in windless environments, as it'd give a much better understanding of the system. But if by chance you happen to have a glimpse of what would happen in a real context with some wind, It'd be interesting too :).