论文标题
Kolmogorov湍流与浮力驱动的气泡流相交
Kolmogorov Turbulence Coexists with Pseudo-Turbulence in Buoyancy-Driven Bubbly Flows
论文作者
论文摘要
我们研究了浮力驱动气泡流的光谱特性。使用高分辨率的数值模拟和均匀湍流的现象学，我们确定了相关的能量转移机制。我们发现：（a）在足够高的galilei数字（浮力与粘性力之比），动能谱显示了kolmogorov缩放的尺度，具有功率法指数$ -5/3 $，用于泡沫直径和耗散量表（$η$）之间的尺度范围。 （b）对于小于$η$的尺度，恢复了伪扰动的物理。
We investigate spectral properties of buoyancy driven bubbly flows. Using high-resolution numerical simulations and phenomenology of homogeneous turbulence, we identify the relevant energy transfer mechanisms. We find: (a) At high enough Galilei number (ratio of the buoyancy to viscous forces) the kinetic energy spectrum shows the Kolmogorov scaling with a power law exponent $-5/3$ for the range of scales between the bubble diameter and the dissipation scale ($η$). (b) For scales smaller than $η$, the physics of pseudo-turbulence is recovered.
