Experimental Observation of Steady Inertial Wave Turbulence in Deep Rotating Flows

Speaker:Eran Sharon
Affiliation:The Racah Institute of Physics, The Hebrew University of Jerusalem
Location:Lidow Rosen Auditorium (323)
Abstract:Rotating turbulence appears in atmospheric, geophysics and astrophysical systems. Despite intensive study, many aspects of such flows remained unresolved. Even the global framework which should be used for the description of rotating turbulence is a subject of an active debate. On the one hand the formalism of two-dimensional turbulence is useful in the description of many aspects of rotating turbulence. On the other hand, theoretical and numerical works suggest that the formalism of wave turbulence should provide a reliable description of the entire three-dimensional flow field. The waves that are suggested as basis for this turbulence are Coriolis driven inertial waves that are solutions of the linearized rotating Navier-Stokes equation.

In this talk I will present experimental evidences for the existence of inertial wave turbulence in deep steady rotating turbulence. First, we show that the energy spectrum evolves via energy cascade from small to large scales. Next we show that in both, evolving and steady state flows, the broad energy spectrum is concentrated along the dispersion relation of inertial waves. The turbulent fields are, therefore, well described as ensembles of 3D interacting inertial waves.