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HELMHOLTZ INSTABILITY [1 record]

Record 1 2002-07-11

English

Subject field(s)
  • Atmospheric Physics
DEF

Type of dynamic instability associated with a discontinuity in the wind velocity across a boundary between two adjacent atmospheric layers.

CONT

Kelvin-Helmholtz instability. A flat vortex sheet of constant strength separates two streams of fluid moving in opposite directions. When the sheet is given a small perturbation, it rolls up to form an array of spiral vortices.

CONT

... "Billow Clouds"... result from a shearing instability formally called dynamic instability(or Kelvin-Helmholtz instability, after Lord Kelvin and H. von Helmholtz). Such shearing instability also causes the flapping of a flag.

French

Domaine(s)
  • Physique de l'atmosphère
DEF

Type d'instabilité dynamique associée à une discontinuité de la vitesse du vent au passage de la surface limite entre deux couches d'air adjacentes.

CONT

Instabilités et physique non linéaire [...] exemples d'analyse de stabilité linéaire de systèmes ayant des transitions supercritiques : l'instabilité de cisaillement (Kelvin-Helmholtz) ou l'instabilité de convection (Rayleigh-Bénard). Exemple de transition sous critique : l'instabilité de Poiseuille.

Spanish

Campo(s) temático(s)
  • Física de la atmósfera
DEF

Tipo de inestabilidad dinámica asociada con una discontinuidad en la velocidad del viento al paso por el límite de separación de dos capas atmosféricas adyacentes.

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