论文标题
涡流率动力学和最小的湍流尺度
Vorticity-strain rate dynamics and the smallest scales of turbulence
论文作者
论文摘要
在Navier-Stokes动力学的内在特性上，即强烈的涡流结构的流行以及涡度和应变速率之间的相互关系，我们提出了一个简单的框架来量化极端事件和最小的湍流规模。我们证明，我们的方法与各向同性湍流的直接数值模拟的最佳可用数据非常吻合，泰勒级雷诺数最高为1300。我们还突出了由于涡度和应变之间观察到的相关性而脱离相关性的偏置，我们还突出了其盛行间歇性模型的缺点。我们的工作强调了这种相关性的重要性，这是对湍流间歇性的准确理解的关键步骤。
Building upon the intrinsic properties of Navier-Stokes dynamics, namely the prevalence of intense vortical structures and the interrelationship between vorticity and strain rate, we propose a simple framework to quantify the extreme events and the smallest scales of turbulence. We demonstrate that our approach is in excellent agreement with the best available data from direct numerical simulations of isotropic turbulence, with Taylor-scale Reynolds number up to 1300. We additionally highlight a shortcoming of prevailing intermittency models due to their disconnection from observed correlation between vorticity and strain. Our work accentuates the importance of this correlation as a crucial step in developing an accurate understanding of intermittency in turbulence.
