Department of Physics, National and Kapodistrian University of Athens, Panepistimiopolis, Zografos, Athens 15784, Greece.
Phys Rev Lett. 2013 May 31;110(22):224501. doi: 10.1103/PhysRevLett.110.224501. Epub 2013 May 29.
In this Letter, we use a nonequilibrium statistical theory, the stochastic structural stability theory (SSST), to show that an extended version of this theory can make predictions for the formation of nonzonal as well as zonal structures (lattice and stripe patterns) in forced homogeneous turbulence on a barotropic β plane. Comparison of the theory with nonlinear simulations demonstrates that SSST predicts the parameter values for the emergence of coherent structures and their characteristics (scale, amplitude, phase speed) as they emerge and at finite amplitude. It is shown that nonzonal structures (lattice states or zonons) emerge at lower energy input rates of the stirring compared to zonal flows (stripe states) and their emergence affects the dynamics of jet formation.
在这封信中，我们使用一种非平衡统计理论，即随机结构稳定性理论（SSST），表明该理论的扩展版本可以对正压β平面上均匀强迫湍流中非涡旋和涡旋结构（格子和条纹图案）的形成进行预测。理论与非线性模拟的比较表明，SSST 预测了相干结构出现时及其特征（尺度、幅度、相速度）的参数值，以及在有限幅度时的参数值。结果表明，与带状流（条纹状态）相比，非涡旋结构（格子态或涡旋元）在较低的搅拌能量输入率下出现，它们的出现会影响射流形成的动力学。
