Rune wrote:
> 
> Well, luckily I haven't got anyone around me who smoke, so I haven't
> really studied any cigarette smoke in details, but if it is anything
> like the smoke that comes when you blow out a match or a candle, then
> maybe the smoke in this animation could go for cigarette smoke.
> 
> Well, obviously from the above, I need a lot of feedback to know if I'm
> on the right track... ;)
> 
> [...]

As Bill and Jaime pointed out the smoke moving straight upwards and
getting turbulent after some way is a classical effect. When you model it
mathematically this has to do with the characteristic length getting
longer and at some point the flow is reaching a critical rayleigh number
and changing from laminar to turbulent (from memory, not sure if totally
correct).

Christoph

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