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Windy
 Aug 8, 08 - 4:34 AM |
Wind Shear, Wind Load, & Wind Speed
Can someone set me straight? All the texts I have read only address wind shear, but what about the normal force from a wind load, say, on a smokestack? Not one text (yet) addresses how to calculate this from wind speed. In the least, cna anyone provide a website, suggest a reference, or provide some cite?  Also, on wind shear, the fluid mechanics texts use a drag coefficient in the equation. But, the few civil refs I've found apply a very similar formula - only WITHOUT the drag coeffcient. Which is correct? Any help would be greatly appreciated.  As everyone knows, it's... - Windy |
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Windy
Aug 10th, 2008 - 6:19 AM |
Re: Wind Shear, Wind Load, & Wind Speed
I was able to answer my own question. In short, it seems there is an overall drag coefficient (Cd) which is the sum of a friction drag coefficient (Cdf) and a pressure drag coefficient (Cdp). The former is clearly from shear (as presented in many texts) and the latter, I can only deduce is what is experienced incident upon a windward surface (since the texts are not clearly explicit on this point. Hope this helps others. By the way, if you want a basic example to follow, refer to Example Problem 9.6 (p. 464) of Fox & McDonald "Introduction to Fluid Mechanics" 3rd ed., (c) 1985, John Wiley & Sons NY. |
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