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- Path: sparky!uunet!destroyer!gatech!psuvax1!psuvm!l89
- Organization: Penn State University
- Date: Fri, 13 Nov 1992 12:51:23 EST
- From: Mark J. Laufersweiler <L89@psuvm.psu.edu>
- Message-ID: <92318.125123L89@psuvm.psu.edu>
- Newsgroups: sci.fractals
- Subject: Re: Lorenz' Weather
- References: <1992Nov11.230938.12710@ncsu.edu>
- <gordon.721582896@tramp.Colorado.EDU>
- <1992Nov12.201358.3135@alchemy.chem.utoronto.ca>
- Lines: 25
-
- In article <1992Nov12.201358.3135@alchemy.chem.utoronto.ca>,
- mroussel@alchemy.chem.utoronto.ca (Marc Roussel) says:
- >
- > These are indeed the Lorenz equations (as they are now known) but
- >these aren't the original weather simulation equations where Lorenz
- >noticed sensitive dependence on initial conditions. Lorenz actually
- >started out with some specialized version of the Navier-Stokes equation
- >(a PDE) and noticed sensitive dependence in these equations under the s
- >condition
- >of his weather simulation. The Lorenz ODEs shown above are a truncation
- >of the Navier-Stokes equation for the special case of (I think)
- >Rayleigh-Benard convection under certain fairly restrictive conditions.
- >Lorenz cooked up these equations as a simple example of what he was
- >seeing in his more sophisticated weather models.
- >
- Barry Saltzman (a Lorenz grad student I believe) ran the experiment which is
- discussed in his paper 1962 J. Atmos. Sci vol 19. Lorenz saw that there
- were primarily only three active modes for R-B convection and thus started
- to help generate this great field.
- --
- =======================================================================
- Mark J. Laufersweiler | I consider the day to be a TOTAL
- l89@psuvm.psu.edu | loss unless I receive HELL
- laufers@psumeteo.psu.edu | from someone!
- |
-