[REQ] New Cavitation...

Capt Jack Harkness · 02-08-08, 06:50 PM

Can anybody out there rig up some more realistic cavitation? First off, the bubbles should really originate from one of the blade tips, not the hub. Second, cavitation should be a stream of bubbles, not a milky cloud. For excellent examples of what I'm talking about, check out the movies K-19: The Widowmaker and U-571.

swdw · 02-08-08, 08:05 PM

whether it's a stream of bubbles or a milky cloud depends on depth, amount of cavitation, speed of prop in relation to current speed, etc.

Just cuz hollywood chooses to show a stream of bubbles doesn't mean that's how it is. You can hear explosions in space in movies too . . . .

You are correct though in the fact that the bubbles appear near the tip of the prop.

Capt Jack Harkness · 02-13-08, 04:25 AM

Well, since a picture's worth a thousand words, here's some real cavitation for ya.

So to get realistic cavitation, we need to have really, really tiny bubbles generated really fast (maybe as low as 30 bubbles per second, but ideally 200+ per second) near the prop tips, hopefully synchronized with prop rotation.

castorp345 · 02-13-08, 08:19 AM

Quote:

Originally Posted by Capt Jack Harkness

So to get realistic cavitation, we need to have really, really tiny bubbles generated really fast (maybe as low as 30 bubbles per second, but ideally 200+ per second) near the prop tips, hopefully synchronized with prop rotation.

'sounds like an fps-killer to me...

Capt Jack Harkness · 02-13-08, 09:52 AM

Yeah... I can't think of any better way to do it, though. Unless we could make 3D cavitation???

andycaccia · 02-13-08, 01:35 PM

Maybe we could re-design the actual textures and make them look like the photos Capt Jack has posted...if possible, of course.:hmm:

Paajtor · 02-18-08, 07:03 AM

Quote:

Originally Posted by Capt Jack Harkness

Well, since a picture's worth a thousand words, here's some real cavitation for ya.

So to get realistic cavitation, we need to have really, really tiny bubbles generated really fast (maybe as low as 30 bubbles per second, but ideally 200+ per second) near the prop tips, hopefully synchronized with prop rotation.

If someone manages to get a 20mm-bullet smoketrail to emerge from each screwblade-tip, and make it work underwater, my gues is it would look the same.

Capt Jack Harkness · 02-18-08, 04:31 PM

Now there's an idea... Anyone have a plan for how to get that one to work?

edjcox · 02-18-08, 10:00 PM

Few will care.. We just got the props to turn in the right direction.. Cavitation trails on Sub props... Cavitation trails on Torpedoe props along with exhaust...

Just don't think it's worth the effort unless there's an easy fix that can just be thrown aboard the code deck with no impact...

But we can always hope, it "springs" eternal you know...

:rotfl:

Xantrokoles · 02-15-08, 09:23 AM

Quote:

Originally Posted by Capt Jack Harkness

Can anybody out there rig up some more realistic cavitation? First off, the bubbles should really originate from one of the blade tips, not the hub. Second, cavitation should be a stream of bubbles, not a milky cloud. For excellent examples of what I'm talking about, check out the movies K-19: The Widowmaker and U-571.

U571 is one of the worst submarine movie ever...!!!
Check out the German Film Das Boot in english!

Capt Jack Harkness · 02-18-08, 02:11 AM

Quote:

Originally Posted by Xantrokoles

Quote:

Originally Posted by Capt Jack Harkness

Can anybody out there rig up some more realistic cavitation? First off, the bubbles should really originate from one of the blade tips, not the hub. Second, cavitation should be a stream of bubbles, not a milky cloud. For excellent examples of what I'm talking about, check out the movies K-19: The Widowmaker and U-571.

U571 is one of the worst submarine movie ever...!!!
Check out the German Film Das Boot in english!

I totally agree; I never said it was a good movie, it just has visual effects far in advance of Das Boot... I mean seriously, the chief sounded three blasts on the dive alarm to submerge and two to surface!

Oh, and would it be in any way possible to integrate a system where the ship cavitates only when the sub is taking evasive action, and/or is near the surface, and/or is using a lot of power at low speed?

As far as I can remember, Sonalysts simulated all of this in Sub Command and Dangerous Waters; but then again, the SCS engine of theirs is far more capable of simulating all the intricacies of the submarine moving through the ocean than the SH engine, it just lacks in the visual department...

02-08-08, 06:50 PM	#1
Capt Jack Harkness Samurai Navy Join Date: Nov 2007 Posts: 567 Downloads: 210 Uploads: 1	[REQ] New Cavitation... Can anybody out there rig up some more realistic cavitation? First off, the bubbles should really originate from one of the blade tips, not the hub. Second, cavitation should be a stream of bubbles, not a milky cloud. For excellent examples of what I'm talking about, check out the movies K-19: The Widowmaker and U-571.

02-08-08, 08:05 PM	#2
swdw Grey Wolf Join Date: Sep 2007 Posts: 921 Downloads: 75 Uploads: 0	whether it's a stream of bubbles or a milky cloud depends on depth, amount of cavitation, speed of prop in relation to current speed, etc. Just cuz hollywood chooses to show a stream of bubbles doesn't mean that's how it is. You can hear explosions in space in movies too . . . . You are correct though in the fact that the bubbles appear near the tip of the prop. __________________ "There are only two types of ships- submarines...... and targets" Unknown "you wouldn't catch me on a ship that deliberately sinks itself"- comment to me from a surface sailor. System: AMD 6300 3.5 GHz \| 32GB DDR3 \| SATA 300 320GB HD, SATA III 1TB HD, SATA III 1.TB HD \| ASUS Sonar DS sound card NVIDIA 1660 Super OC \| Windows 10

02-13-08, 01:35 PM	#6
andycaccia XO Join Date: Aug 2007 Location: Italy Posts: 418 Downloads: 261 Uploads: 2	Maybe we could re-design the actual textures and make them look like the photos Capt Jack has posted...if possible, of course.:hmm: __________________ "Memento Audere Semper"

02-18-08, 10:00 PM	#9
edjcox Engineer Join Date: Apr 2005 Location: Shang Gri La Posts: 219 Downloads: 61 Uploads: 0	Cavitation De Jour Few will care.. We just got the props to turn in the right direction.. Cavitation trails on Sub props... Cavitation trails on Torpedoe props along with exhaust... Just don't think it's worth the effort unless there's an easy fix that can just be thrown aboard the code deck with no impact... But we can always hope, it "springs" eternal you know... :rotfl: __________________ EJ Cox http://i190.photobucket.com/albums/z...jcox/usaCa.gif

02-13-08, 04:25 AM	#3
Capt Jack Harkness Samurai Navy Join Date: Nov 2007 Posts: 567 Downloads: 210 Uploads: 1	Well, since a picture's worth a thousand words, here's some real cavitation for ya. So to get realistic cavitation, we need to have really, really tiny bubbles generated really fast (maybe as low as 30 bubbles per second, but ideally 200+ per second) near the prop tips, hopefully synchronized with prop rotation.

02-13-08, 09:52 AM	#5
Capt Jack Harkness Samurai Navy Join Date: Nov 2007 Posts: 567 Downloads: 210 Uploads: 1	Yeah... I can't think of any better way to do it, though. Unless we could make 3D cavitation???

02-18-08, 04:31 PM	#8
Capt Jack Harkness Samurai Navy Join Date: Nov 2007 Posts: 567 Downloads: 210 Uploads: 1	Now there's an idea... Anyone have a plan for how to get that one to work?