Wind Behavior in a city

Hello,

I am trying to mimic wind behavior in a city. The goal is to use a bunch of blocks (buildings) to deform a series of lines (wind) to flow around them. The model should satisfy the following criteria:

The wind should respond to city density. If there are a bunch of standalone buildings then the wind flows around each of them. If there are many buildings next to each other the wind flows around the whole group of buildings.

The wind can blow from any direction.

I saw these example,

http://www.grasshopper3d.com/forum/topics/lines-flow-around-circles

perhaps, I can use first part of the code, but the main problem for me is teaching grasshopper to differentiate between standalone buildings and groups of buildings.

Any ideas on logic I can use? Your help is much appreciated.

Volha

Replies to This Discussion

Permalink Reply by Arpan Bakshi on July 26, 2012 at 6:22pm

Volha, this resource may do something similar to what you are looking for:

Sonic 4
http://www.studionu.net/ceed3/?p=2342

Permalink Reply by MARIO VERGARA on July 26, 2012 at 6:33pm

thanks arpan....will test

cheers

Permalink Reply by Jon Mirtschin on July 26, 2012 at 11:11pm

Maybe the virtual wind tunnel in Vasari can help (not sure yet about extracting a result back to GH)

http://geometrygym.blogspot.com/2012/05/grasshopper-to-vasari-via-r...

Permalink Reply by Volha on July 27, 2012 at 2:48pm

Hi Guys,

Thank you for you response. Unfortunately, I am developing an educational grasshopper model and adding additional plug-ins makes it difficult for beginners to use. I’m looking for a geometrical solution to this problem.

Permalink Reply by MARIO VERGARA on July 27, 2012 at 3:07pm

http://www.studionu.net/ceed3/?p=1141

Permalink Reply by djordje on July 28, 2012 at 9:01am

Volha, can you explain the purpose of your project?
What are you planning to do with those wind lines?

If you want to take some kind of CFD (computational fluid dynamics) analysis, for example: an impact of the wind on the shape of the buildings or on pedestrians, bear in mind that this is quite complex problem, a whole science. And that few curves that go around objects in Rhino and Grasshopper can not replace it.

Even in these modern days of advanced software technologies, CFD applications are still not reliable as wind tunnels - a real world analysis of the wind impact.

Permalink Reply by Arpan Bakshi on July 28, 2012 at 10:22pm

Volha, building on this comment, as your project is academic, if you have a long time frame, and are doing research, one interesting thesis project would be to write a grasshopper CFD plug-in using the CFD calculations provided in OpenFoam, an open source CFD program and source code.

http://www.openfoam.com/

Permalink Reply by Volha on July 29, 2012 at 12:42am

Hi Arpan and Djordje,

Thank you for attention. It is not a project with a long time frame, so no thesis projects. Wind behavior is not the main point of the model I am working on. I wanted to use wind just as a representational tool to visually distinguish high density neighborhoods from low density neighborhoods. It doesn’t have to be scientifically accurate.

Permalink Reply by Luis Fraguada on July 29, 2012 at 6:31am