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Anisotropía y estructuras de vórtice coherentes en la turbulencia planetaria.

J C McWilliams, J B Weiss, I Yavneh

Science (New York, N.Y.)

|April 15, 1994

Resumen

Las simulaciones de alta resolución de la dinámica de fluidos desafían la predicción de la isotropía. En cambio, los flujos a escala planetaria se autoorganizan en vórtices coherentes, lo que lleva a un estado no turbulento.

Área de la Ciencia:

Dinámica de fluidos La dinámica de fluidos.
La geofísica es la geofísica.
Ciencias de la atmósfera ciencia atmosférica.
Oceanografía La oceanografía es la oceanografía.

Sus antecedentes:

La dinámica de fluidos a escala planetaria es crucial para comprender la atmósfera y los océanos de la Tierra.
Las predicciones teóricas sugieren que tales flujos deberían exhibir isotropía.
Los modelos anteriores a menudo simplificaban las complejas interacciones de fluidos.

Objetivo del estudio:

Para investigar la dinámica de flujos de fluidos no forzados a escala planetaria utilizando simulaciones numéricas de alta resolución.
Para probar la predicción teórica de larga data de la isotropía en estos sistemas.
Comprender los mecanismos de autoorganización dentro de los flujos de fluidos a gran escala.

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Principales métodos:

Empleó simulaciones numéricas de alta resolución.
Utilizó ecuaciones cuasi-geostróficas para un fluido de Boussinesq.
Simuló un entorno estratificado de rotación uniforme y estabilidad.

Principales resultados:

Se observaron discrepancias significativas con respecto a la isotropía predicha.
Identificó la autoorganización del flujo en una gran población de vórtices coherentes.
Demostró que las interacciones de vórtices caóticos gobiernan la evolución del flujo.

Conclusiones:

Se desafía el supuesto de la isotropía en la dinámica de fluidos a escala planetaria.
Las dinámicas de vórtice coherentes juegan un papel crítico en la autoorganización de los flujos geofísicos.
Estos flujos evolucionan hacia un estado final no turbulento, impulsado por interacciones de vórtice.