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Article #14

Re: Coherent structures

#14
From: Bruce Scott
Date: Wed, 29 Jul 1992 14:26
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fearnley@ERE.UMontreal.CA (Fearnley Anne) writes:
>give me some references, I will be very grateful. 

A recent reference which discusses both plasmas and geo-fluids is
  A Hasegawa, Adv Phys 34, 1 (1985).

>     As well, how about some opinions on the subject itself, with
>supporting arguments. Some folks think the coherent structure business
>is rubbish and a craze, and some think its the key to turbulence.

Understanding why coherent structures (usually long-lived monopolar or
dipolar vortices) emerge from turbulence and survive it is interesting
and important. However, the practical importance is overblown. Most of
the results are specific to homogeneous and isotropic situations, which
do not describe the important natural ones. In plasmas, inhomogeneity
usually kills these things. Claims that coherent solitons can explain
turbulent transport of heat, particles, or momentum is certainly going
too far.

Gruss,
Dr Bruce Scott                             The deadliest bullshit is
Max-Planck-Institut fuer Plasmaphysik       odorless and transparent
bds at spl6n1.aug.ipp-garching.mpg.de                 -- W Gibson



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Path: arc1-ca.pugleaf.net!sparky!uunet!paladin.american.edu!gatech!rutgers!concert!samba!usenet
From: Bruce.Scott@bbs.oit.unc.edu (Bruce Scott)
Newsgroups: sci.geo.fluids
Subject: Re: Coherent structures
Summary: review reference, effects of inhomogeneity
Keywords: turbulence
Message-ID: <1992Jul29.142638.4518@samba.oit.unc.edu>
Date: 29 Jul 92 14:26:38 GMT
References: <1992Jul28.014855.27248@cc.umontreal.ca>
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