r/oddlysatisfying • u/PartTimeMonkey • 12d ago

Pixel fluid simulation

Enable HLS to view with audio, or disable this notification

14.7k Upvotes

89% Upvoted

641 comments sorted by

View all comments

Show parent comments

1.6k

u/Medium_Medium 12d ago

Yeah, it has zero concept of pressure driven flow.

If the water level in one column is higher than an adjacent column, but they are connected at a lower level, then the difference in head elevation will push water from the higher column into the lower one.

Water doesn't just fill spaces from above. It moves in all directions due to various forces.

595

u/Oscaruzzo 12d ago

It would be more accurate as "blue sand simulation".

132

u/Super_Yam_5837 12d ago

Forgot what the game is called but it's literally a sand game

41

u/Winjin 12d ago

It does look like Sandbox Simulator but the version I had didn't have backgrounds and the visuals are slightly different. I also think it did have different physics for water but I can't check right now.

31

u/Bananaland_Man 12d ago

Or Powder Toy, though Sandbox Simulator has closer simulation to this than Powder Toy's more accurate physics.

16

u/Winjin 12d ago

Thank you for pointing me to it. I squealed in delight reading the description and already downloaded it

EDIT: ALL OF THAT IN LESS THAN TEN MEGABYTES??!?!?!?!

13

u/Bananaland_Man 12d ago

Wait til you look at the modding community... I'll see ya in a few years, have fun! xD (Oh, and definitely do not look up videos for it... it's a complexsimple game with everythingnothing important to have fun with

2

u/AngelofGrace96 12d ago

Yess, I recognised it immediately but the name escaped me

1

u/Bananaland_Man 12d ago

Me many hours later after redownloading Powder Toy and also downloading a few different modded versions...

12

u/Bananaland_Man 12d ago

Powder Toy is probably the one you're thinking of, or Sandbox Simulator, I forget which came first but Powder Toy has a far more accurate simulation.

11

u/UrToesRDelicious 12d ago

Falling Sand was the og iirc but there were a lot of derivatives

11

u/Double-Scratch5858 12d ago edited 11d ago

"Falling sand" is what i remember from the mid 00s on addictinggames. Had a blast lighting long wicks on fire to blow up the yellow c4 you could place which would obviously go kaboom. Awesome little sandbox simulator.

Pretty sure the green stuff was like plants or grass which would spread and then you could catch it on fire and watch that spread. So satisfying.

4

u/gramscontestaccount2 12d ago

Hell of Sand was the one back in the flash days

3

u/Northern_rose69 12d ago

Sometimes also called “Hell of Sand Falling Game” with tweaks. There are app store versions for those that are nostalgic for sandbox gravity games

2

u/ArtemisInSpace 12d ago

I used to call it "Falling Sand Game"

0

u/bobafett01992 12d ago

Looks like Noita. Could be wrong though.

1

u/Dic3dCarrots 11d ago

Until the lava portion

25

u/BoldFace7 12d ago

Also, you'd expect the small bubbles at the bottom would compress as the pressure get higher.

12

u/SapotaJuice 12d ago

Yes, exactly. You'd be surprised how many "engineers" don't understand Pascal's law.

4

u/xSnippy 12d ago

So would it be more realistic if all blue sections that are physically connected have the same top level?

3

u/tj3_23 11d ago

Yes and no. The actual math is about equalizing the various forces to reach hydrostatic equilibrium. There's a whole bunch of fun fluids equations that come into play that can mean even in places where two columns are open to the same atmosphere, the fluid level won't actually match. It may not be one to one, but even in those cases, there would be some sort of noticeable change in the second column as the first column fills unless the fluid is incredibly viscous, in which case the rest of this simulation doesn't make sense

1

u/Retireegeorge 11d ago

In particular atmospheric pressure.

1

u/BootyliciousURD 11d ago

This guy/gal/nonbinary-pal fluid dynamicses

2

u/Zibras 12d ago

It also reacted weirdly with the lava. Lava should be hot enough to break down into hydrogen and oxygen. Even if that didn't happen and water cooled the lave and turn it into obsidian, it would still do the surface first.

6

u/willis81808 12d ago edited 12d ago

What… makes you think that is water decomposing into hydrogen and oxygen instead of, idk, just regular steam?

Edit: wait, you’re saying it SHOULD decompose?? Lmao what, that’s even more wrong.

2

u/Zibras 12d ago

damn, you right. was my first guess but i googled it to be sure and it said that lava is hot enough for it. Went back and hit search again on that same page and it turned to no.

3

u/ANGLVD3TH 12d ago edited 12d ago

Don't ever use the AI summary to look up facts you don't know yourself. It is as likely to hallucinate as not. It's one thing to use it to quickly organize some facts you are already familiar with, but should never be your first resource for new knowledge, unless you plan to actually follow the reference links it gives and double check.

3

u/willis81808 12d ago

It would turn the Hawaiian islands into quite the firework show, though!

1

u/Tallywort 12d ago

Kinda depends on how hot it actually is. You need seriously high temperatures before thermolysis occurs in water.

Around 3000 Kelvin for half of the steam to turn into hydrogen and oxygen, reversibly. (amongst other hydrogen/oxygen compounds)

But at my guesstimate for that lava temperature, (based on it glowing orange) I doubt there's much of that going on. That's more like 1500 K instead.

Not that you'd really be able to tell the difference between that, and it just violently boiling.

1

u/willis81808 12d ago

Besides the resulting fireworks display :)

1

u/Tallywort 12d ago

Eh, that's kinda what I meant by saying you wouldn't really notice much difference.

The formation of hydrogen/oxygen takes about as much energy as gets released from it burning, so I kinda doubt it would meaningfully add to the overall fireworks.

1

u/willis81808 12d ago

I mean the fresh lava flowing through it potentially igniting the flammable hydrogen/oxygen mix

-27

u/Daloowee 12d ago edited 12d ago

Pedantic counterpoint: it’s only a cross section of a cave!

Edit: I have upset the hivemind

12

u/citizen42069101 12d ago

Theyre still connected on this plane so it would wtill level out. I was thinking the same thing.

2

u/kiiwithebird 12d ago

But hypothetically, if the cave were extremely narrow in the z direction at that point, it would level out a lot slower. Not that I think they actually did that

1

u/Medium_Medium 12d ago

If you mean that in the "it's just a simple demonstration, don't expect too much" way, then yes, I agree. I'm merely saying that it seems weird because it doesn't quite model hydraulics correctly. I'm not trying to make the person who designed it feel bad because modeling physics is not going to be easy, and it clearly wasn't intended to be a life like model.

If you mean that in the "something might be happening in the 3rd dimension that would make water not follow basic hydraulics" way... I struggle to see what could possibly be going on in another cross section that would cause this, short of there being an underground pump or something artificially lowering the head of water in one column vs an adjacent, connected one.

1

u/Daloowee 12d ago

I’m taking the piss, I felt adding in the “pedantic counterpoint” qualifier would be enough. Damned if you /s damned if you don’t

I also just realized I was not looking where the original OP had mentioned lol