We study the direct enstrophy cascade in a two-dimensional flow generated in an electromagnetically driven thin layer of fluid. Due to the presence of bottom friction, the energy spectrum deviates from the classical Kraichnan prediction k(-3). We find that the correction to the spectral slope depends on the thickness on the layer, in agreement with a theoretical prediction based on the analogy with passive scalar statistics.
Effects of friction on 2D turbulence: An experimental study of the direct cascade / G., Boffetta; Cenedese, Antonio; Espa, Stefania; S., Musacchio. - In: EUROPHYSICS LETTERS. - ISSN 0295-5075. - STAMPA. - 71:4(2005), pp. 590-596. [10.1209/epl/i2005-10111-6]
Effects of friction on 2D turbulence: An experimental study of the direct cascade
CENEDESE, Antonio;ESPA, Stefania;
2005
Abstract
We study the direct enstrophy cascade in a two-dimensional flow generated in an electromagnetically driven thin layer of fluid. Due to the presence of bottom friction, the energy spectrum deviates from the classical Kraichnan prediction k(-3). We find that the correction to the spectral slope depends on the thickness on the layer, in agreement with a theoretical prediction based on the analogy with passive scalar statistics.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
