Hi Guys!

I'm currently trying to achieve a similar effect to the wind passing over the car in this video [youtube.com]for the new GTR from AMG. I've been using Houdini since 9am this morning so I'm fairly green when it comes to this.

In Fume, I set up four emitters that shot smoke down four long tubes with a wind emitter at the end to scatter the smoke but this produced unrealistic results so I decided to see what I could do in Houdini.

A friend of mine suggested to “do it with splines, create a velocity attribute from the tangents and then create a volume from that.” I know he's fairly busy at the moment so I don't want to bother him with constant questions “how do I do this/that/the other” etc.

I've attached an image so you can see how far I have(n't) got.

Cheers!

For wind tunnels, I always build everything from an empty Smoke Container from the Fluid Containers shelf. I don't use any of the pyro presets.

Use the Wind Tunnel vector wind direction to build your wind tunnel. This gives you a constant laminar velocity flow inside the container and feeding in to the container when playing forward.

Then add your smoke emitters wherever you want using the Populate Containers shelf tool add source. For the source volumes make sure to have a solid smoke emitter (empty interior off) and high resolution with no feathering, turn off density noise. A nice sharp clean source.

Enable Vortex Confinement as this will help in building the vortices generated in a wind tunnel.

See the attached file as a start.

Thanks Jeff! I've been looking over your file and trying to work out what's going on. I have a little bit of understanding but there's a couple things I'm not sure about. Am I correct in assuming that the sim in your file is generating vortices already and I use them to drive the smoke?

This is fantastic! Thank you so much for posting of the hip file. I'm learning quite a bit by studying the hip file!