Fluid splash animation
Russ Edmonds, Sun Aug 10 2014, 08:04PMI 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.
Re: Fluid splash animation
Russ Edmonds, Fri Aug 22 2014, 02:21AM
Blender was used to create this animation study on the effect of drop velocity on fluid splash.
Russ Edmonds, Fri Aug 22 2014, 02:21AM
Blender was used to create this animation study on the effect of drop velocity on fluid splash.
Re: Fluid splash animation
Nucleophobe, Mon Sept 08 2014, 03:37AM
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
Nucleophobe, Mon Sept 08 2014, 03:37AM
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
Re: Fluid splash animation
Russ Edmonds, Tue Sept 09 2014, 11:27AM
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:
Russ Edmonds, Tue Sept 09 2014, 11:27AM
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:
Re: Fluid splash animation
Nucleophobe, Thu Sept 11 2014, 02:27PM
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.
Nucleophobe, Thu Sept 11 2014, 02:27PM
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.
Re: Fluid splash animation
Russ Edmonds, Thu Sept 11 2014, 06:32PM
To increase the viscosity of the water Xanthan gum is a popular additive. To lower the surface tension I've heard of using detergents.
Russ Edmonds, Thu Sept 11 2014, 06:32PM
To increase the viscosity of the water Xanthan gum is a popular additive. To lower the surface tension I've heard of using detergents.
Re: Fluid splash animation
Russ Edmonds, Tue Sept 30 2014, 08:41PM
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
Russ Edmonds, Tue Sept 30 2014, 08:41PM
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
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