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Formación de patrones por cascadas turbulentas
Xander M de Wit1, Michel Fruchart2,3, Tali Khain3
1Department of Applied Physics and Science Education, Eindhoven University of Technology, Eindhoven, The Netherlands.
Nature
|March 21, 2024
Resumen
Las cascadas de energía turbulenta ahora pueden generar patrones a través de un mecanismo no lineal. La viscosidad impar, una propiedad de los fluidos quirales, controla el patrón
Área de la Ciencia:
- Dinámica de fluidos
- Física no lineal
- Formación del patrón
Sus antecedentes:
- La turbulencia completamente desarrollada es un estado caótico con energía en cascada a pequeñas escalas donde ocurre la disipación.
- La formación de patrones generalmente se basa en inestabilidades lineales, no en mecanismos no lineales.
Objetivo del estudio:
- Para demostrar un nuevo mecanismo no lineal para generar patrones de cascadas turbulentas.
- Identificar el parámetro físico clave que controla la longitud de onda del patrón emergente.
Principales métodos:
- Análisis teórico de la detención de la cascada turbulenta.
- Simulaciones numéricas a gran escala de la dinámica de fluidos.
- Investigación del papel de la viscosidad impar.
Principales resultados:
- Las cascadas turbulentas pueden detenerse sin disipar en escalas intermedias, lo que lleva a una acumulación de energía.
- Esta acumulación de energía impulsa la formación de patrones a través de un mecanismo completamente no lineal.
- La viscosidad impar, una fuerza similar a Coriolis dependiente de la escala, ajusta la longitud de onda del patrón.
Conclusiones:
- Se descubre una nueva ruta no lineal para la formación de patrones en la turbulencia.
- La viscosidad impar en los fluidos quirales se identifica como un factor clave en el control de las características del patrón.
- Este mecanismo tiene implicaciones potenciales para los flujos atmosféricos, el viento solar y el procesamiento de materiales.
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