Turbulence, So Now I Know

By /
I've always known that modelling moving fluids is VERY difficult. Take a look at early movie CGI and any liquid feels "solid". When they cracked it, and by that I mean when they had worked out how to fool us, there was a big step up in the types of movies we all got to ignore.
So I knew modelling turbulence was hard.

And I just read an article that, whilst explaining the work of some people that proved something or other, explained why turbulence is so hard.

Turbulence is recursive. By that I mean look closely at a swirling vortex within turbulent water* and there are tiny vortices, and it's vorticies all the way down, "until the effects of internal friction (or viscosity) within the fluid take over and the flow smooths out."

Hah, obvious when you read about it and obvious when you think about it.

With so so many layers all bundled up inside one another then, yeah, it's bloody hard.

And now I know, and so do you.

* doesn't have to be water, one could easily think about a turbulent life, a turbulent society, a turbulent game, and the same recursive-ness applies - there's always something deeper going on

Comments

Post a Comment

Be kind

Popular articles

Make Your Public Event Calendar Usable To All

Image
If you run a sports club, this post is for you. If you are on a community committee, this post is also for you If you host events, this is for you. If you put on shows, this is for you. In fact, if you do anything that has a date/time component that you'd like to share with people, this is for you . Yep, probably for all of us. Sharing calendars can be both: an effective way of letting everyone know a complete and utter technical pain in the bottomly region If you've posted up an events page onto your website you know how difficult it is to keep up to date, how the readers have to keep coming back to get the latest changes and don't even think about integrating with somebody else's "events page". Ok, so we all know the problem. What's the solution? iCalendar (normally shortened to iCal) ... yep, it's a geek word that you will come to know and love just as much as RSS. In fact, think of it as RSS for calendars. But that's enough geekery, if you want

The Difference Between One Million And One Billion

Image
It's feels like a billion is just a bit bigger than a million. Obviously it's bigger but it fits on the same scale as a million, surely. It doesn't. A billion is so so so much bigger than a million. I've trawled the internet finding graphics and videos that show the VAST difference between one million and one billion. Oh, and just to finish with a different misconception about space starting with the classic opening line from the great Douglas Adams and The Hitchhiker's Guide To The Galaxy : “Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.”

Reflections In Blue

Image
Of course "Reflections In Blue" Is a jazz album. Art Blakey and his Messengers Would love you to hear it. Coooool.

[Updated] Pubs of 2024 Monmouth

Image
"Back in the day", yada yada yada, yes we all know there were more pubs than people, there was a pub every two houses, the largest number of pubs per square mile than anywhere in the known universe, there was a pub named after each and every one of us, and yet, YET we only ever went to same one every time. Monmouth has changed, it now only has 10 pubs.  "Ten! Ten? It used to be ten pubs just in the top of town. There were ten pubs I'd walk past to get to my local." Yes, yes ... times change, we now have 10 pubs in Monmouth . Oh, and the Mayhill but that seems to be more a ghost pub, it can be seen but only in the dark and no-one will believe if you say you went in. Monmouth, a town in Wales (YES, it is in Wales ), a town that has a population of around 10,317 (as at 2021). A town who's 1980's population was, well, I don't know, despite a century of censuses being taken, it's impossible to find (1991: 8,206 | 2001: 8,877 | 2011: 10,508 | 2021: 1

Mates

Image
Mates, I assume, chatting on the Petone foreshore.