论文标题
自由表面湍流中的瞬态反向能级联
Transient inverse energy cascade in free surface turbulence
论文作者
论文摘要
我们研究了由直接数值模拟在流体层中以不同厚度的直接数值模拟产生的大雷诺数的自由表面湍流的统计数据，并具有固定的特征强迫量表。我们观察到瞬时级联反向级联的产生，其持续时间取决于层的厚度，然后过渡到最初产生的三维湍流，该湍流最初产生的底部靠近底部，无滑落边界。通过关闭强迫，我们研究了腐烂的湍流制度，我们发现它不能由指数定律描述。我们的结果表明，边界条件在薄层产生的湍流的性质中起着基本作用，并限制了产生二维现象学的条件。
We study the statistics of free-surface turbulence at large Reynolds numbers produced by direct numerical simulations in a fluid layer at different thickness with fixed characteristic forcing scale. We observe the production of a transient inverse cascade, with a duration which depends on the thickness of the layer, followed by a transition to three-dimensional turbulence initially produced close to the bottom, no-slip boundary. By switching off the forcing, we study the decaying turbulent regime and we find that it cannot be described by an exponential law. Our results show that boundary conditions play a fundamental role in the nature of turbulence produced in thin layers and give limits on the conditions to produce a two-dimensional phenomenology.
