Low-frequency vortex oscillation around slender bodies at high angles-of-attack

被引：18
|
作者：
Ma, Bao-Feng [1 ]
Liu, Tong-Xin [1 ]
机构：
[1] Beihang Univ, Key Lab Fluid Mech, Minist Educ, Beijing 100191, Peoples R China
来源：
PHYSICS OF FLUIDS | 2014年 / 26卷 / 09期
基金：
中国国家自然科学基金;
关键词：
ASYMMETRIC VORTICES; CIRCULAR-CYLINDERS; OGIVE-CYLINDER; FLOW; BODY; REVOLUTION; SEPARATION; MODEL; WAKE;
D O I：
10.1063/1.4895599
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Low-frequency unsteadiness of vortices over an ogive-cylinder body was studied using numerical simulation and Dynamic Mode Decomposition (DMD). The results revealed that the vortices over the fore-body of the slender body can exhibit vortex oscillation with a non-dimensional frequency of 0.054 at 70 degrees angle-of-attack, but the flow pattern over the aft-body downstream is Karman vortex shedding. The vortex oscillation induces larger sectional side-forces on the body than vortex shedding. The DMD analysis for the sectional flow fields at various sections shows that the most energetic mode corresponds to the vortex oscillation at the fore-body and the vortex shedding at the aft-body except the mode for a mean flow, and the associated frequencies are identical to the ones of the sectional side-forces obtained by Fourier transformation. (C) 2014 AIP Publishing LLC.
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页数：7
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