Liquid Simulation: Cool Visual Effects

[Kevin_Axion]

This is a very cool liquid simulation: http://grantkot.com/MPM/Liquid.html.

 

[pallidin]

I'm getting Digital Certificate security warnings when I click on the link.

 

[Andy Resnick]

This is a very cool liquid simulation: http://grantkot.com/MPM/Liquid.html.

that *is* cool- thanks for posting it. I don't think it's a 'liquid', tho- more like a hard-=sphere gas. No interfacial energy, for example.

 

[K^2]

No interfacial energy, for example.

Refresh the page. Watch the corners of the square carefully. It looks to me like there is surface tension, which makes it a true liquid sim. Albeit, at zero temperature.

 

[cjl]

I'm fairly sure it's a true liquid simulation, temperature and all. The points aren't meant to represent individual molecules.

 

[Kevin_Axion]

It is a liquid.

 

[Studiot]

Impressive, many thanks.

A speed control would be a really useful addition.

 

[Andy Resnick]

Refresh the page. Watch the corners of the square carefully. It looks to me like there is surface tension, which makes it a true liquid sim. Albeit, at zero temperature.

I'm fairly sure it's a true liquid simulation, temperature and all. The points aren't meant to represent individual molecules.

It is a liquid.

How is it a liquid? One cannot detach a drop- only individual particles. At least, I was unable to make a drop.

 

[Kevin_Axion]

Just by hitting the water with some minimal force it appears that there is some surface tension. Also, the program was made for the study of fluid dynamics, but then again the creator and I could be wrong: http://kucg.korea.ac.kr/seminar/2008/src/PA-08-09-19.pdf. Some of the particles do coalesce into droplets but they aren't circular.

 

[Andy Resnick]

I agree the simulation is of a bulk fluid- I was referring to the free surface. The simulation (and figures 6,7 in the paper) is a very clever approach to simulating the appearance of free fluid surfaces for the limiting case Ca -> inf, where Ca is the capillary number.

There are codes that can model a free fluid surface correctly:

http://www.informaworld.com/smpp/content~content=a907333311~db=all~jumptype=rss
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WHR-4CXCHN0-F4&_user=10&_coverDate=01%2F31%2F1988&_rdoc=1&_fmt=high&_orig=search&_origin=search&_sort=d&_docanchor=&view=c&_searchStrId=1576492482&_rerunOrigin=google&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=543f49b6421ce977c90a24918f6212cc&searchtype=a
http://portal.acm.org/citation.cfm?id=1764289

But AFAIK, these approaches are not used in the OP simulation.

 

[Kevin_Axion]

The fluid now has particles with different colours which may make it easier to analyze the flow and dynamics of the liquid. There is also an inherent tendency for the particles of the same colour to coalesce much like a lava lamp, further motivating the existence of interfacial energy within the substance.

 

[Kevin_Axion]

I will also add that the liquid appears to act as a dynamical system for instance a single movement of 2 particles causes a vast change in the general liquid distribution once it has settled.

 

[Kevin_Axion]

As suggested, there are now adjustable parameters.

 

[Andy Resnick]

Kevin_Axion,

Thanks! I have a new favorite time-waster... :)

awesome job , seriously.

 

[Kevin_Axion]

No, don't thank me! I guess you can for posting it, but I didn't develop any part of the program.

I'll make this certain: I take no credit for any particular part of this program (other then making it known to the PF community).