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Incomplete models increase global warming
Professor Pielke of Colorado State University show how current climate models fail to take in the several important factors, such as how planting forest on snow covered mountains make the forest absorb more sunlight and heat or replacing forest with farm land removes the cooling effect forests have through water evaporation on leaves. NASA has a story about it.
posted by bjelkeman at 12:51

Reduced drag on pipes
In their paper "Passive control of VIV with drag reduction. J. Fluids and Struct. 15, pp 597-605, 2001" J.C.Owen, P.W.Bearman and A.A.Szewczyk, talk about drag reductions of between 25% and 47% on particularly shaped pipes (as opposed to straight cylinder shaped pipes). Apparently this has now also been confirmed by independent commercial research. We have mentioned this before with a reference to their European patents.

Does the added engineering costs for producing a pipe in the particular shapes overcome the benefit of the lowered drag?

posted by bjelkeman at 13:07