论文标题
低雷诺数数量湍流在弹性墙上
Low Reynolds number turbulent flows over elastic walls
论文作者
论文摘要
我们研究了粘性高弹性壁上的层流和湍流通道，并表明可以通过正确选择壁弹性模量来维持任何雷诺数的不稳定混沌湍流。我们通过评估流体和弹性层中的剪切应力和湍流动能预算，提出了这种效果的物理解释。我们将批量雷诺数从2800变为10，并确定两个不同的湍流产生机制。在中等和高雷诺数的情况下，湍流波动激活了壁振荡，从而扩大了流体中湍流的雷诺应力。在雷诺数非常低的情况下，唯一的生产项是由于弹性壁的能量输入所致，这随着壁弹性的增加而增加。可以利用该机制在微流体设备中被动增强混合。
We study the laminar and turbulent channel flow over a viscous hyper-elastic wall and show that it is possible to sustain an unsteady chaotic turbulent-like flow at any Reynolds number by properly choosing the wall elastic modulus. We propose a physical explanation for this effect by evaluating the shear stress and the turbulent kinetic energy budget in the fluid and elastic layer. We vary the bulk Reynolds number from 2800 to 10 and identify two distinct mechanisms for turbulence production. At moderate and high Reynolds numbers, turbulent fluctuations activate the wall oscillations, which, in turn, amplify the turbulent Reynolds stresses in the fluid. At very low Reynolds number, the only production term is due to the energy input from the elastic wall, which increases with the wall elasticity. This mechanism may be exploited to passively enhance mixing in microfluidic devices.
