I'd like to experimentally simulate air flow turbulences around obstacles. Building the obstacles in one thing, but providing a well characterised flow (and mix it with something visible like smoke...) is something else. In general, I think the whole idea is easier to acomplish compared to fluid turbulences in a water tank. Any ideas for an air blow device where I know how fast the air is flowing and how I could regulate the velocity? Hairdryer is tricky as it introduces temperature. Any DIY tutorials for something of this sort - I didn't find any and am also no electronics guy to build and program sophisticated stuff myself...if anything, more the wood, saw, and nails type. Thank you very much.