Brown Eric, Ahlers Guenter
Department of Physics and iQCD, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.
Phys Rev Lett. 2007 Mar 30;98(13):134501. doi: 10.1103/PhysRevLett.98.134501. Epub 2007 Mar 26.
A model for the large-scale-circulation (LSC) of turbulent Rayleigh-Bénard convection in cylindrical samples is presented. It consists of two physically motivated stochastic ordinary differential equations, one each for the strength and the azimuthal orientation of the LSC. Stochastic forces represent phenomenologically the influence of turbulent fluctuations. Consistent with measurements, the model yields an azimuthally meandering LSC with occasional rotations, and with more rare cessations. As in experiment, cessations have a uniform distribution of LSC orientation changes.
本文提出了一种用于圆柱形样品中湍流瑞利-贝纳德对流大尺度环流（LSC）的模型。它由两个基于物理原理的随机常微分方程组成，分别描述LSC的强度和方位取向。随机力从现象学角度代表了湍流涨落的影响。与测量结果一致，该模型产生了一个方位上蜿蜒的LSC，偶尔会发生旋转，且停止现象更为罕见。与实验情况一样，停止时LSC取向变化具有均匀分布。
