[kollsman]

I had done velocity simulation using star CCM+ before.

Right now, I am trying to simulate the vehicular pollution reduction potential by trees and shrubs at roadside conditions.

Anyone has experience doing this before?
- how do you simulate the porosity of the vegetation?
- how to set up the particulate pollution in CCM?

Thanks a lot.

[ruedanestor]

Do you have to explicitly model the vegetation?

The common practice is to define a surface roughness.

Have a look at this: http://www-das.uwyo.edu/~geerts/cwx/...roughness.html

As for the emissions from the cars, I would not model explicitly the particles but a concentration instead since the particles must be smaller than PM10.

If you want to use particles anyway, you have to use a lagrangian multiphase model and define the injection points. I would define the vegetation as an escape condition so the code deactivates the particle after touching that boundary.

Hope it helps,

Néstor