Perlekar Prasad, Mitra Dhrubaditya, Pandit Rahul
Department of Mathematics and Computer Science, Eindhoven University of Technology, Eindhoven, The Netherlands.
Phys Rev E Stat Nonlin Soft Matter Phys. 2010 Dec;82(6 Pt 2):066313. doi: 10.1103/PhysRevE.82.066313. Epub 2010 Dec 27.
We carry out a direct numerical simulation (DNS) study that reveals the effects of polymers on statistically steady, forced, homogeneous, and isotropic fluid turbulence. We find clear manifestations of dissipation-reduction phenomena: on the addition of polymers to the turbulent fluid, we obtain a reduction in the energy dissipation rate; a significant modification of the fluid-energy spectrum, especially in the deep-dissipation range; and signatures of the suppression of small-scale structures, including a decrease in small-scale vorticity filaments. We also compare our results with recent experiments and earlier DNS studies of decaying fluid turbulence with polymer additives.
我们进行了一项直接数值模拟（DNS）研究，揭示了聚合物对统计上稳定、受迫、均匀且各向同性的流体湍流的影响。我们发现了明显的耗散减少现象：在湍流流体中添加聚合物后，我们得到了能量耗散率的降低；流体能量谱有显著改变，尤其是在深度耗散范围内；以及小尺度结构受到抑制的特征，包括小尺度涡旋细丝的减少。我们还将我们的结果与最近关于添加聚合物添加剂的衰减流体湍流的实验和早期DNS研究进行了比较。
