数学与系统科学研究院

计算数学所学术报告

报告人：        Yin Zhaohua

中国科学院计算数学研究所

报告题目 Alternative statistical-mechanical descriptions of decaying two-dimensional turbulence in terms of "patches" and "points"

Abstract: Numerical and analytical studies of decaying, two-dimensional (2D) Navier-Stokes (NS) turbulence at high Reynolds numbers are reported. The effort is to determine computable distinctions between two different formulations of maximum entropy predictions for the decayed, late-time state. Both formulations define an entropy through a somewhat ad hoc discretization of vorticity to the “particles” of which statistical mechanical methods are employed to define an entropy, before passing to a mean-field limit. In one case, the particles are delta-function parallel “line” vortices (“points” in two dimensions), and in the other, they are finite-area, mutually-exclusive convected “patches” of vorticity which in the limit of zero area become “points.” We use time-dependent, spectral-method direct numerical simulation of the Navier-Stokes equations to see if initial conditions which should relax to different late-time states under the two formulations actually do so.

报告时间：2004年2月11日  下午4：00

报告地点：科技综合楼三层报告厅