Rotating turbulence evolving freely from an initial quasi 2D state

Autor:	M. Mory, E.J. Hopfinger
Rok vydání:	2008
Předmět:	Physics::Fluid Dynamics Physics Ekman layer Classical mechanics Turbulent diffusion Turbulence K-epsilon turbulence model Turbulence modeling Two-dimensional flow Inertial wave Vortex
Zdroj:	Macroscopic Modelling of Turbulent Flows ISBN: 9783540156444
DOI:	10.1007/3-540-15644-5_16
Popis:	Recent experiments demonstrated the existence of quasi-twodimensional turbulence in a boundary-forced fluid system subjected to strong rotation. The principal results are briefly recalled and an inertial wave mechanism is proposed as an explaination for the observed sudden transition from 3D turbulence to a quasi-twodimensional turbulent flow. The main contribution of the paper is however concerned with the freely evolving state, obtained when the forcing is suddenly stopped. Experiments show an increase in time of the turbulence length scale, indicating an inverse energy flux. These observations are analysed in terms of a similarity theory derived for evolving turbulence with Ekman friction. The scale increase is by pairing of vortices of like sign and by large scale unsteady meandering motions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::86256fd966dfef7ee703301dbcd51dae https://doi.org/10.1007/3-540-15644-5_16 Zobrazit plný text záznamu