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ENSTROPHY [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2003-08-01

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Fluid Mechanics and Hydraulics (Physics)
  • Atmospheric Physics
DEF

Half of the square of the relative vorticity.

CONT

The term was popularized by C. Leith and is based on the modern Greek, meaning act of turning. Enstrophy is a conservative quantity in two-dimensional inviscid flow. However, when viscosity is finite, enstrophy tends to be selectively decayed relative to more rugged integrals such as energy and angular momentum.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Mécanique des fluides et hydraulique (Physique)
  • Physique de l'atmosphère
DEF

Moitié du carré du tourbillon relatif.

CONT

Entrophie. Concept utilisé dans la simulation de la turbulence atmosphérique dite de «deux dimensions» où l'atmosphère est considérée comme un fluide bi-dimensionnel, incompressible, non visqueux, à densité constante.

Spanish

Campo(s) temático(s)
  • Medición y análisis (Ciencias)
  • Mecánica de fluidos e hidráulica (Física)
  • Física de la atmósfera
DEF

Mitad del cuadrado de la vorticidad relativa.

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Record 2 2003-08-01

English

Subject field(s)
  • Scientific Measurements and Analyses
  • Fluid Mechanics and Hydraulics (Physics)
  • Atmospheric Physics
CONT

The kinematics of turbulent vorticity fields are derived. Points of zero and minimal enstrophy (squared vorticity) are found to move approximately with the fluid, except for small viscous diffusion velocities.

French

Domaine(s)
  • Mesures et analyse (Sciences)
  • Mécanique des fluides et hydraulique (Physique)
  • Physique de l'atmosphère
DEF

Carré de la vorticité.

CONT

[...] les modèles LES (Large Eddy Simulation) [...] ont pout but de calculer directement la dynamique des grandes échelles en introduisant une modélisation des plus petites. Nous avons développé une modélisation des petites échelles basée sur un développement en multi-échelles des équations régissant le fluide. Le premier ordre du développement donne l'équation d'évolution des petites échelles qui traduit la conservation d'une quantité appelée enstrophie (le carré de la vorticité).

Spanish

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