Billowing in a Vacuum?
- Thread starter Bambi
- Start date
Presumably, gasses are being expelled with whatever is coming out of that hole and yes, the gasses being expelled could cause the clouds to "billiow". For all anyone knows that planet you are landed on may have some sort of very thin atmosphere. Just because we cannot breathe it or survive in it does not mean it does not exist.
It may not say it but there are spots which appear to have thin atmosphere. I have seen many deep craters where a thin haze has accumulated.
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So gas flow at different pressures is quite an interesting subject
For a planet with basically no atmosphere, if it really is hard vacuum, gas particles will flow in straight lines, there will be now billowing.
If you have any atmosphere, even at the few mbar level, you can get some billowing, but it will mostly just be smog or you just wont be able to see it. Just like jets we see from planets today, they should actually stream almost straight from the surface rather than clouding up (UNLESS you are in an area with thick smog)
It is more of "What looks good" for the most part in terms of physics
Same goes for water eruptions, Zero atmosphere, water would either be frozen solid, or vapour... to get water under vacuum to be flowing liquid is kinda impossible.
Still, it looks pretty cool
For a planet with basically no atmosphere, if it really is hard vacuum, gas particles will flow in straight lines, there will be now billowing.
If you have any atmosphere, even at the few mbar level, you can get some billowing, but it will mostly just be smog or you just wont be able to see it. Just like jets we see from planets today, they should actually stream almost straight from the surface rather than clouding up (UNLESS you are in an area with thick smog)
It is more of "What looks good" for the most part in terms of physics
Same goes for water eruptions, Zero atmosphere, water would either be frozen solid, or vapour... to get water under vacuum to be flowing liquid is kinda impossible.
Still, it looks pretty cool
It looks mundane. A realistic vacuum jet would look cooler and more alien.
It's not atmosphere, it's some kind of very low density particulate dust. Braben talks about it in one of the horizons videos I think.
It's not atmosphere, it's some kind of very low density particulate dust. Braben talks about it in one of the horizons videos I think.
What about the ones where it says these gas releases provide a "seasonal" type atmosphere....?
[noob]
EDIT: Ninja'd
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I would think turbulence would be one issue.
Also: I'd expect the random direction of the individual molecules to send it in all directions.
In short: It should resemble an explosion.
I don't think the jets we are seeing today are gasses (primarily).
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Not really, It all depends on the size of the orifice and the density. Molecular flow is basically straight, there will be a small random component but it wouldn't billow out as shown.
It is all dependant upon if the mean free path of the particles is less than the orifice diameter. In atmospheric pressures yep you get turbulent flow, at high vacuum, it is molecular flow
What id expect is that you would get a high velocity turbulent yet, which as it dissipates would basically turn to molecular flow with most of the outflow retaining most of its vertical velocity. I mean depending on lots of things its even possible to get a shock cone effect.
It is all dependant upon if the mean free path of the particles is less than the orifice diameter. In atmospheric pressures yep you get turbulent flow, at high vacuum, it is molecular flow
What id expect is that you would get a high velocity turbulent yet, which as it dissipates would basically turn to molecular flow with most of the outflow retaining most of its vertical velocity. I mean depending on lots of things its even possible to get a shock cone effect.
Not so. If the edge of the vet is rough this will cause the gasses to appear as they are billowing. The same effect can be seen on the underwater black smokers we have here on Earth. I'd say Frontier actually did a good job to model this and not go for the 'no-atmosphere = straight up gas emissions'. Then there are of course pressure variations in the rate the gas is being expelled, friction would cause the gas closer to the vent wall to move at a different speed to the gas in the centre of the pipe.
I think you have to address "Glide" before you address this. There's clearly a few mechanics that are made to look cool, or be QoL mechanics that sidestep reality. It IS a game... They implement science where they can, not everywhere.
Deep underwater is the opposite of a vacuum.
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This makes absolutely no sense. One is a visual effect, the other is a gameplay mechanic. Why would you implement realism in the mechanic and not the visual effect, if your concern is that it's a game? Think next time.
I was about to say...
Well chances are you'll never even see a fumarole,so probably best to not get yer knickers in a twist.
I agree it wouldn't billow. I said exactly that in the post you are responding to.
At the point the gas enters vacuum, the movement of each molecule is random (the definition of "gas"); so why would the direction of the gas be anything but random?
I mean: I suppose if the rate of outgassing was higher than the pressure you might get something of a cone... or if the pressure was really, really low in the source; you might have gas with little relative molecular motion (see: Gas columns shot from stars).
The gas is in an atmosphere of gas. By definition: the vacuum is always outside the gas atmosphere.
Eventually the gas gets diffuse enough that it's no longer gas and you are back to vacuum... but until then: turbulence and random molecule direction.
I can't find anything on this though. Everything that comes up is about expanding into a closed container with a vacuum (which says the gas will expand in all directions to fill the container)
Then explain the atmospheric buffeting experienced when performing landing maneuvers on many worlds. Anyway, fumaroles shooting stuff straight up into space probably wasn't "pretty".
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Imperfect performance / balancing from your lateral thrusters as they attempt to slow you down / keep you level / whatnot?!?
Heck: tell me why gimballed weapons are unsteady? I can see them losing aim at the moment of fire if the weapon has recoil (say: a MC); but since the spacecraft should be completely steady, so should they.
Glide was already addressed. You're riding the collapsing FSD wake or something like that, you're obviously not actually gliding. Fairly sure it wa seven mentioned in one of the Horizons livestreams.
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Which doesn't work for some reason if your angle is wrong.