TERMIUM Plus®

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EFFET LORENZ [1 record]

Record 1 1995-10-16

English

Subject field(s)
  • Mathematics
  • Computer Graphics
DEF

A large effect resulting from the instability in a small cause, metaphorically described by E. Lorenz as the effect produced on the prairie atmosphere by the flutter of the wings of a butterfly in a distant jungle, leading to a devastating prairie tornado.

OBS

A computer-modeled weather forecasting experiment by Edward Lorenz that helped understand an essential property of nonlinear phenomena i.e. the sensitivity to initial conditions characteristic of fractals. See Lorenz attractor.

CONT

The Butterfly effect: for small pieces of weather - and to a global forecaster, small can mean thunderstorms and blizzards - any prediction deteriorates rapidly. Errors and uncertainties multiply, cascading upward through a chain of turbulent features, from dust devils and squalls up to continent-size eddies that only satellites can see.

French

Domaine(s)
  • Mathématiques
  • Infographie
DEF

Mise en évidence de la sensibilité aux conditions initiales dans une modélisation informatique des prévisions météorologiques effectuée en 1963 par le mathématicien Edward Lorenz : dans un milieu instable, susceptible d'amplifier une perturbation minimale, une cause insignifiante, tel le vol d'un papillon, peut avoir un effet énorme comme l'émergence d'une tempête.

OBS

Les effets de Joseph, de Noé, de capillarité, de percolation, de frustration et de tension de surface rendent compte de phénomènes similaires en physique des solides et des liquides.

Spanish

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