Wind Tunnel simulation

[markus_schnatmann]

Hello together,
I'm trying to simulate something like the Audi (still from video)
There are a few problems:
-The smoke does not keep a consistent form. (see attachment)
- The smoke does not go directly over the objects. It keeps always an unrealistic distance.

I tried various settings but did no achieve any sim that is near to the audi simulation.

Can anybody help me further?

[slavina.nikolova]

Hey,

We have a Wind Tunnel Template Scene that you might find useful - https://docs.chaos.com/display/PHX4M...nes-WindTunnel.

The scene uses Plain Force to create the wind and the streamlines are made up of Drag particles generated from the Source. The particles are carried with the velocity field. A Discharge Modifier with a curve with spikes is used in the Phoenix Source, so the streamlines appear only at certain positions over the emitter box. You can play around with this curve in order to create the desired look. More info about the Discharge Modifiers could be found here - https://docs.chaos.com/display/PHX4M...arge+Modifiers.
The top, bottom and side walls of the Grid are Jammed, in order to channel the velocity better. Forward Transfer advection helps keeping the streamlines tight. Also, some Classic Vorticity is used. The Classic Vorticity algorithms works depending on the velocity of the simulation and changes the velocity field in order to reinforce vortices and add more detail to the simulation. More information and examples about Vorticity and Advection could be found here - https://docs.chaos.com/display/PHX4M...mics-Vorticity and https://docs.chaos.com/display/PHX4MAX/FireSmoke+Dynamics#FireSmokeDynamics-Transport(Advection).
You could experiment with PCG or Direct Symmetric Conservation methods. The Conservation process gives the fluid its characteristic swirling motion. It transforms straight-line movement of the fluid into swirling vortices. Here you can find more info and examples - https://docs.chaos.com/display/PHX4M...y(Conservation).
In the Template Scene, the Drag particles are emitted with Velocity channel and then Motion Blur is used for the V-Ray rendering, which is something that you might want to experiment with.


Hope this helps!

[markus_schnatmann]

Thank you for the quick reply Slavina.
I just started to play with your Template.

looks good!

[hunter_williams]

Is there a Maya scene of this I could use?

[slavina.nikolova]

Hey,

Here it is - https://docs.chaos.com/display/PHX4M...nes-WindTunnel.


Cheers!

[hunter_williams]

Thank you!