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

2014 ◽  
Vol 26 (9) ◽  
pp. 091701 ◽  
Author(s):  
Bao-Feng Ma ◽  
Tong-Xin Liu
Keyword(s):  
Low Frequency ◽  
Slender Bodies ◽  
High Angles Of Attack

SINGULAR AERODYNAMIC FEATURES OF LOW-SPEED HIGH-ANGLES-OF-ATTACK SLENDER BODIES

1988 ◽  
pp. 435-440
Author(s):  
K. Suzuki ◽  
M. Matsuzaka ◽  
T. Watanuki ◽  
N. Itoda ◽  
H. Kubota
Keyword(s):  
Low Speed ◽  
Slender Bodies ◽  
High Angles Of Attack

scholarly journals Investigation of Flow Around a Slender Body at High Angles of Attack

2019 ◽  
Vol 30 (1) ◽  
pp. 51-61
Author(s):  
Ibraheem AlQadi Ibraheem AlQadi
Keyword(s):  
High Frequency ◽  
Low Frequency ◽  
The Body ◽  
Slender Body ◽  
Frequency Mode ◽  
Dynamic Mode ◽  
High Frequency Mode ◽  
Wide Range ◽  
Low Frequency Mode ◽  
High Angles Of Attack

A numerical investigation of flow around a slender body at high angles of attack is presented. Large eddy simulation of the flow around an ogive-cylinder body at high angles of attack is carried out. Asymmetric vortex flow was observed at angles of attack of α = 55◦ and 65◦ . The results showed that the phenomenon is present in the absence of artificial geometrical or flow perturbation. Contrary to the accepted notion that flow asymmetry is due to a convective instability, the development of vortex asymmetry in the absence of perturbations indicates the existence of absolute instability. An investigation of the unsteady flow field was carried out using dynamic mode decomposition. The analysis identified two distinct unsteady modes; high-frequency mode and low-frequency mode. At angle of attack 45◦ the high-frequency mode is dominant in the frontal part of the body and the low-frequency mode is dominant at the rear part. At α = 55◦ , the highfrequency mode is dominant downstream of vortex breakdown. At α = 65◦ , the spectrum shows a wide range of modes. Reconstruction of the dynamical modes shows that the low-frequency mode is associated with the unsteady wake and the high-frequency mode is associated with unsteady shear layer.

scholarly journals The Visualization of Separated Flow over Slender Bodies at High Angles of Attack.

1994 ◽  
Vol 14 (55) ◽  
pp. 243-252 ◽  
Author(s):  
Mingyang JIA ◽  
Tadaharu WATANUKI ◽  
Hirotoshi KUBOTA
Keyword(s):  
Separated Flow ◽  
Slender Bodies ◽  
High Angles Of Attack

Flowfield about and Forces on Slender Bodies at High Angles of Attack

AIAA Journal ◽  
1981 ◽  
Vol 19 (3) ◽  
pp. 296-302 ◽  
Author(s):  
William J. Yanta ◽  
Andrew B. Wardlaw
Keyword(s):  
Slender Bodies ◽  
High Angles Of Attack

Flat spin of slender bodies at high angles of attack

1983 ◽  
Vol 20 (2) ◽  
pp. 108-114 ◽  
Author(s):  
Hirotoshi Kubota ◽  
Isao Arai ◽  
Masayoshi Matsuzaka
Keyword(s):  
Slender Bodies ◽  
High Angles Of Attack
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