Welcome
Username or Email:

Password:


Missing Code




[ ]
[ ]
Online
  • Guests: 23
  • Members: 0
  • Newest Member: omjtest
  • Most ever online: 396
    Guests: 396, Members: 0 on 12 Jan : 12:51
Members Birthdays:
One birthday today, congrats!
uzzors2k (35)


Next birthdays
03/29 GrantX (34)
03/30 Adam Horden (39)
03/30 Mr.Warwickshire (23)
Contact
If you need assistance, please send an email to forum at 4hv dot org. To ensure your email is not marked as spam, please include the phrase "4hv help" in the subject line. You can also find assistance via IRC, at irc.shadowworld.net, room #hvcomm.
Support 4hv.org!
Donate:
4hv.org is hosted on a dedicated server. Unfortunately, this server costs and we rely on the help of site members to keep 4hv.org running. Please consider donating. We will place your name on the thanks list and you'll be helping to keep 4hv.org alive and free for everyone. Members whose names appear in red bold have donated recently. Green bold denotes those who have recently donated to keep the server carbon neutral.


Special Thanks To:
  • Aaron Holmes
  • Aaron Wheeler
  • Adam Horden
  • Alan Scrimgeour
  • Andre
  • Andrew Haynes
  • Anonymous000
  • asabase
  • Austin Weil
  • barney
  • Barry
  • Bert Hickman
  • Bill Kukowski
  • Blitzorn
  • Brandon Paradelas
  • Bruce Bowling
  • BubeeMike
  • Byong Park
  • Cesiumsponge
  • Chris F.
  • Chris Hooper
  • Corey Worthington
  • Derek Woodroffe
  • Dalus
  • Dan Strother
  • Daniel Davis
  • Daniel Uhrenholt
  • datasheetarchive
  • Dave Billington
  • Dave Marshall
  • David F.
  • Dennis Rogers
  • drelectrix
  • Dr. John Gudenas
  • Dr. Spark
  • E.TexasTesla
  • eastvoltresearch
  • Eirik Taylor
  • Erik Dyakov
  • Erlend^SE
  • Finn Hammer
  • Firebug24k
  • GalliumMan
  • Gary Peterson
  • George Slade
  • GhostNull
  • Gordon Mcknight
  • Graham Armitage
  • Grant
  • GreySoul
  • Henry H
  • IamSmooth
  • In memory of Leo Powning
  • Jacob Cash
  • James Howells
  • James Pawson
  • Jeff Greenfield
  • Jeff Thomas
  • Jesse Frost
  • Jim Mitchell
  • jlr134
  • Joe Mastroianni
  • John Forcina
  • John Oberg
  • John Willcutt
  • Jon Newcomb
  • klugesmith
  • Leslie Wright
  • Lutz Hoffman
  • Mads Barnkob
  • Martin King
  • Mats Karlsson
  • Matt Gibson
  • Matthew Guidry
  • mbd
  • Michael D'Angelo
  • Mikkel
  • mileswaldron
  • mister_rf
  • Neil Foster
  • Nick de Smith
  • Nick Soroka
  • nicklenorp
  • Nik
  • Norman Stanley
  • Patrick Coleman
  • Paul Brodie
  • Paul Jordan
  • Paul Montgomery
  • Ped
  • Peter Krogen
  • Peter Terren
  • PhilGood
  • Richard Feldman
  • Robert Bush
  • Royce Bailey
  • Scott Fusare
  • Scott Newman
  • smiffy
  • Stella
  • Steven Busic
  • Steve Conner
  • Steve Jones
  • Steve Ward
  • Sulaiman
  • Thomas Coyle
  • Thomas A. Wallace
  • Thomas W
  • Timo
  • Torch
  • Ulf Jonsson
  • vasil
  • Vaxian
  • vladi mazzilli
  • wastehl
  • Weston
  • William Kim
  • William N.
  • William Stehl
  • Wesley Venis
The aforementioned have contributed financially to the continuing triumph of 4hv.org. They are deserving of my most heartfelt thanks.
Forums
4hv.org :: Forums :: Computer Science
« Previous topic | Next topic »   

Fluid splash animation

Move Thread LAN_403
Russ Edmonds
Sun Aug 10 2014, 08:04PM
Russ Edmonds Registered Member #46264 Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
I used Blender and VirtualDub to make this very short animation.

Number of frames: 250
Fluid simulation bake time: 5 hrs.
Render time: 3.5 hrs.

Back to top
Russ Edmonds
Fri Aug 22 2014, 02:21AM
Russ Edmonds Registered Member #46264 Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
Blender was used to create this animation study on the effect of drop velocity on fluid splash.
Back to top
Nucleophobe
Mon Sept 08 2014, 03:37AM
Nucleophobe Registered Member #108 Joined: Thu Feb 09 2006, 11:44PM
Location: Billings, MT
Posts: 61
Nice job Russ! I like how you performed some investigation of the physics in the second animation. Blender is great fun. You should take some video now and see how the fluid sims compare to reality.

If you didn't already know, the Blender fluid simulator uses the lattice Boltzmann method (http://en.wikipedia.org/wiki/Lattice_Boltzmann_methods) and was developed by Nils Thürey as part of a Google-funded "Summer of Code" project.

Thürey has done a lot of great research on fluid animation, with a recent focus on turbulence modeling. His models have been used in some big films like "The Avengers" and "Man of Steel". You can see some of his work on his website:
http://www.ntoken.com/pubs.html
or his YouTube page:
https://www.youtube.com/user/nthuerey/videos


As you can tell, I'm kind of a fan haha. Anyway, I'm a fluid mechanics guy myself, and the animation thing has become a hobby for me. Here's one of my animations of a falling droplet in Blender using Thürey's code:



Take care,
-Ken
Back to top
Russ Edmonds
Tue Sept 09 2014, 11:27AM
Russ Edmonds Registered Member #46264 Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
Hi Ken,
I have been thinking about how to make a high speed video of a real splash. The fluid domain size was set to 0.1 meter and the viscosity was set to water in the animation study and I can see that the Worthington jet is not as smooth looking as a real one. I have been looking at a lot of amazing water splash photos on the web and a "trick" some photographers use is to increase the viscosity and lower the surface tension of the water. I going to increase the viscosity in the fluid simulation in Blender to see what happens.

I'm a fan of Nils Thürey also. This animation by him is fantastic:

Back to top
Nucleophobe
Thu Sept 11 2014, 02:27PM
Nucleophobe Registered Member #108 Joined: Thu Feb 09 2006, 11:44PM
Location: Billings, MT
Posts: 61
I've seen a view of Nils videos, but I hadn't seen this surface tension one - thanks for sharing! Very interesting.

Do you know what kind of high-viscosity fluids photographers generally use? I was thinking maybe a glycerine-water mixture, but I'm not sure what the surface tension would be like.
Back to top
Russ Edmonds
Thu Sept 11 2014, 06:32PM
Russ Edmonds Registered Member #46264 Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
To increase the viscosity of the water Xanthan gum is a popular additive. To lower the surface tension I've heard of using detergents.
Back to top
Russ Edmonds
Tue Sept 30 2014, 08:41PM
Russ Edmonds Registered Member #46264 Joined: Sun May 11 2014, 05:27PM
Location: Tucson, Arizona USA
Posts: 61
I made a composite video of a real water drop splash. A series of images from different splashes were combined to make this video. Each image was delayed by two milliseconds from the previous one. A total of seventy one images were used.
The conditions for the splashes were:
Drop height = 63.5 cm, Drop radius = 2.0 mm
At this height the impact velocity is 3.5 m/s

Back to top

Moderator(s): Chris Russell, Noelle, Alex, Tesladownunder, Dave Marshall, Dave Billington, Bjørn, Steve Conner, Wolfram, Kizmo, Mads Barnkob

Go to:

Powered by e107 Forum System
 
Legal Information
This site is powered by e107, which is released under the GNU GPL License. All work on this site, except where otherwise noted, is licensed under a Creative Commons Attribution-ShareAlike 2.5 License. By submitting any information to this site, you agree that anything submitted will be so licensed. Please read our Disclaimer and Policies page for information on your rights and responsibilities regarding this site.