糖心TV Complexity Science Events
Complexity Centre and MathSys CDT events carry priority over room D1.07.
To book D1.07 please email Sheetal dot Sharma at warwick dot ac dot uk
Please note that your event booking is for D1.07 only. The adjacent common room is a private area for the MathSys Centre that cannot used as part of your booking.
Complexity Forum
Location: Maths B3.02
Colm Connaughton
Center for Nonlinear Studies and Theoretical Division, Los Alamos National Laboratory, NM, USA
Finite size effects in turbulent inverse cascades - a comparision of two-dimensional and quasi-geostrophic turbulence
Talk in two parts:
15:15-15:55 General complexity audience
15:55-16:15 Tea break
16:15-16:55 Specialists
An inverse energy cascade occurs both in two-dimensional turbulence and in quasi-geostrophic turbulence owing to the presence of a second inviscid invariant in addition to the energy. For finite size systems, if the dissipation of energy at large scales is sufficiently weak or entirely absent, the inverse cascade eventually pumps a energy into the largest scales where it begins to accumulate. This results in a steepening of the energy spectrum at large scales. In the case of two-dimensional turbulence, this accumulation results in the spontaneous emergence of intense coherent vortices of a size comparable with the system size. In this talk I will describe the emergence and structure of these vortices in detail and compare effects of energy accumulation with a similar scenario in quasi-geostrophic turbulence.
contact through G. Pruessner (g.pruessner@physics.org)