Its possible to create this with grasshopper?

Replies to This Discussion

Permalink Reply by Daniel Piker on September 16, 2010 at 10:41am

Looks a bit like ideal flow past a cylinder, which you can model with the complex number components

Attachments:

• cylinderflow.ghx, 252 KB

Permalink Reply by jl on September 16, 2010 at 11:12am

Hi Daniel, thanks.
But i have the newest version of grasshopper i cant open it. can you make an image or print screen pls

Permalink Reply by taz on September 16, 2010 at 1:28pm

If I remember correctly from fluid dynamics (probably not) laminar flow can be defined mathematically as Daniel says...

Laminar flow

Stream function

Also, streamlines are perpendicular to equipotential lines so here's a link to an equipotential definition.

http://www.grasshopper3d.com/profiles/blogs/generating-isopotential...

Permalink Reply by Daniel Piker on September 16, 2010 at 3:54pm

Yup, that's what the definition I posted above does.
I don't know why it wouldn't open for you - Joao - do you have gh 0.7.0054 ?

I'm glad to be able to show something where the complex modulus / arg functions are really useful !

It's not always so easy to find the perpendicular streamlines corresponding to a set of equipotentials - in that 'Isopotential Map' definition you link to for example you'd have to use something like gradient descent to find them step by step. The awesome thing about doing it with complex numbers is that you skip that altogether and finding streamlines becomes just as easy as taking contours.

Permalink Reply by jl on September 20, 2010 at 8:23am

Thanks guys.

Permalink Reply by taz on September 20, 2010 at 2:56pm

Pretty cool example. Thanks for sharing!

(I'm only just now taking a look)