论文标题
螺旋湍流中的能量反向级联
Inverse cascade of energy in helical turbulence
论文作者
论文摘要
使用在所有尺度上施加的水力动力湍流的直接数值模拟，获得了接近最大的螺旋湍流状态，在比能量强迫尺度大的尺度上具有反向能量级联，并且在尺度上的向前螺旋级数小于能量强迫尺度。与以前使用催化三合会的研究相反，我们的模拟包含所有可能的三合会。通过计算壳壳能量通量，我们表明逆级别级联反应是由于同种三合会之间的弱非本地相互作用而产生的。改变螺旋注射范围的尺度范围会导致必要的条件获得反向能量级联反应。
Using direct numerical simulation of hydrodynamic turbulence with helicity forcing applied at all scales, a near-maximum helical turbulent state is obtained, with an inverse energy cascade at scales larger than the energy forcing scale and a forward helicity cascade at scales smaller than the energy forcing scale. In contrast to previous studies using decimated triads, our simulations contain all possible triads. By computing the shell-to-shell energy fluxes, we show that the inverse energy cascade results from weakly non-local interactions among homochiral triads. Varying the helicity injection range of scales leads to necessary conditions to obtain an inverse energy cascade.
