• Alfredo N. Wetzel
  • Wednesday, Dec. 8. 4-5 p.m.
  • EH 3866

Many interesting fluid phenomena in the atmosphere and ocean are strongly nonlinear and disordered. These features make problems in turbulence generally intractable in terms of particle motion. Simplifications arise from averaging techniques that obtain mean flow properties. Further, horizontal length scales tend to be much larger than vertical scales in the ocean and atmosphere making the flow behave roughly in a 2D manner. This presentation is intended as a brief introduction to some interesting results in 2D incompressible turbulence. We will primarily build enough theory to discuss the following interesting phenomena of 2D turbulent flow: Kolmogorov’s -5/3 spectrum, cascade of the energy to large scales, and cascade of the enstrophy to small scales. These cascades are unique to 2D turbulence and counter 3D turbulent flow theory. Some real world examples where these effects occur will be presented to motivate the discussion.

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