Something similar is depicted in the film 'Elysium'. But it is a open torus, rather than a closed cylinder and they never explain how they keep the atmosphere in.
not familiar with the design, is there gravity? that’s why our atmosphere sticks around, right?
And even if their atmosphere wasn't lost, the inhabitants would quickly suffocate and die due to low air pressure. On Earth, there's 10 tonnes of atmosphere pushing down on every square meter at sea level, compressing the air to 1 bar. Reduce that ~100 km column of air to ~100 m, and the pressure would be very much lower.
The main advantage of open air designs is it allows you to use aerobreaking when approaching the habitat which could be a significant save in fuel.
One possible solution is to ionise the air near the walls and then use a magnetic field to contain it. This would not really prevent all air leakage but you don't really have to as long as it's substantially reduced since even the relatively diminutive size of the Elysium habitat would contain a fairly formidable volume of air. There can also be outside magnets that can arrest the momentum of the escaped ionised air enough so it falls back down to Earth. Then all you need is a tether extending down to the atmosphere with an internal air pump and you have a self contained cycle.
How tall do atmosphere retaining walls on rotating space habitats need to be?
https://worldbuilding.stackexchange.com/questions/119739/how...
It doesn't matter what frictionless calculations say, the air will climb through any wall you create until it gets out of the station.
According to the stackoverflow entry above, a 10km high wall on a ringworld would leak about half the atmosphere every century.
Obviously the wall would have to be airtight.
You might be able to slow down the loss of gas by putting lips on the tops of the walls and maybe even air jets blowing downward though. Or leave it mostly closed except for a few openings for spacecraft to enter or leave. Also, working out the practical considerations for a Ringworld is an exercise in futility anyway. You are already well beyond practical when you start building one.
Yeah, with constant gravity and no friction.
100km isn't enough because no height is ever enough, because friction exists. Any wall will have a flow of air near it going away into space, as a result, the pressure will fall much slower than exponentially.
Yes. So you would need to build it multiple of 10km. Assuming the pressure falls of 75% for each 10km (which seems about right from a quick glance at some tables), if it was 100km high the loss would be 0.25^10 of what it would be at 10km. So 100km wall would be ~million times less loss than a 10km wall.
The gravity would be constant if the rotation was constant. No sure what you mean by 'no friction'. Friction against the wall?
Hum... No. The gravity reduces linearly with height.
And yes, friction against the wall.
I'm not convinced friction with the wall is going to result in any additional air loss. There is no 'upward' (towards the top of the wall) force component.
Friction ensures that whatever air reaches a high altitude near a wall tends to stay at that altitude and spread again on the lower gravity. The difference in pressure between this higher place and a lower one bias the movement up, there is no upward force component on the dynamics of any few components you can choose, it's emergent.
In fact, starting with 0080 war in the pocket isn't a bad idea given the self contained story.
From there, I'd check out 0083: Stardust memory and move on to the Zeta Gundam tv show.
Then, for a completely different experience, you can check out the alternate universe shows like Mobile Fighter G Gundam or After War Report Gundam X
https://colonydrop.podbean.com/e/space-colonies/
For actual in-depth scientific exploration of the colonies of Gundam, Dyar Straights is pretty great: