Is there any experimental study of the turbulent multiphase flow (air + sand) around aerodynamics obstacles ?

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Do interactions between biosphere, carbon cycle, & water cycle impact global warming & interaction between atmosphere & hydrosphere?

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Zoubair Boulahia

Hoping this helps you. Good luck.

Tamas Kalmar-Nagy

The phenomenon is called "brownout":

https://en.wikipedia.org/wiki/Brownout_(aeronautics)

A google scholar search on helicopter brownout experiment brings up quite a few hits, e.g.

http://eprints.gla.ac.uk/5133/1/AHS_2008_Nathan_Green.pdf