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Re: vortex shedding

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I have been trying find some reference material for designing spoilers
on tall stacks.  Your participation in discussing "vortex shedding"
makes me believe that you may have some leads to the information I am
seeking.  If you have such information, please respond to my email
address which is: rajendra(--nospam--at)



Christopher Wright wrote:
> >the wind load acting only onto
> >the upper third of a column while checking vortex shedding instability.
> >
> >Does any one of you know the justification of this assumption?
>  My guess is that the 'instability' (I think it's actually flutter) only
> imposes dynamic loading on the upper 1/3 because the movement of the
> lower portion is too small to shed vortices. Could also be that the
> bottom two thirds lies in the boundary layer or lies in the lee of
> surrounding structures. All of which is preamble to saying I don't
> actually know.
> Christopher Wright P.E.    |"They couldn't hit an elephant from
> chrisw(--nospam--at)        | this distance"   (last words of Gen.
> ___________________________| John Sedgwick, Spotsylvania 1864)