Computational study on near wake interaction between undulation body and a D-section cylinder
Computational study on near wake interaction between undulation body and a D-section cylinder
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DOI：
10.1016/j.oceaneng.2010.12.017
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发表时间：
2011-03
影响因子：
5
通讯作者：
Q. Xiao;K. Sun;Hao Liu;Jianxin Hu
中科院分区：
文献类型：
--
作者：
Q. Xiao;K. Sun;Hao Liu;Jianxin Hu
本文对NACA 0012翼型在D形截面圆柱近尾迹中的水动力性能进行了数值研究。计算采用非定常不可压Navier-Stokes方程，基于层流流动，采用移动自适应网格。研究了在不同的翼型波动频率（St）下，翼型尖端与圆柱中心的距离比（L/D≤2.0）对翼型和圆柱的推力/阻力性能的影响。结果表明，随着圆柱体的出现，翼型推力系数Ct显著增大，且存在一个最佳距离，在该距离处Ct达到最大值。在St=0.23和L/D=0.5时，最大增量约为单翼的11倍。我们的结果为圆柱阻力系数（Cd）观察到最佳参数映射的存在，结合不同的间隙比和箔频率。在这些参数下，波形翼片的插入可以显著地减少阻力，表明波形翼片可以有效地作为圆柱体减阻的被动涡流控制装置。
We present a numerical study on the hydrodynamic performance of undulation NACA0012 foil in the near wake of D-section cylinder. Computations are conducted using unsteady incompressible Navier–Stokes equations with a moving adaptive mesh based on laminar flow. Investigations are focused on the effect of distance ratio between foil tip and centre of cylinder (L/D≤2.0) on the thrust/drag performance of foil and cylinder at various foil undulation frequency (St). We found that, foil thrust coefficient (Ct) increases considerably with the appearance of cylinder and an optimal distance exists at which Ctreaches maxima. The maximum increment is about eleven times that of its counterpart of single foil, which is obtained at St=0.23 and L/D=0.5. Our results for the cylinder drag coefficient (Cd) observed the existence of optimal parametric map, combined with various gap ratios and foil frequencies. With these parameters, insertion of an undulation foil can significantly lead to the drag reduction indicating that undulating foil could work efficiently as a passive vortex control device for cylinder drag reduction.