Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L60: Poster Session II
11:15 AM,
Wednesday, March 7, 2018
LACC
Room: West Hall A
Abstract ID: BAPS.2018.MAR.L60.340
Abstract: L60.00340 : Trantision of a compressible square cylinder wake structures subjected to free-stream disturbance*
Presenter:
Yohei Inoue
(Univ of Electro-Comm (UEC))
Authors:
Yuma Tasai
(Univ of Electro-Comm (UEC))
Yohei Inoue
(Univ of Electro-Comm (UEC))
Tsuyoshi Kanuma
(Univ of Electro-Comm (UEC))
Hiroshi Maekawa
(Univ of Electro-Comm (UEC))
By examining the effects of upstream velocity disturbances on the wake flow structure, the following results are obtained.
In the preprimary study, the two-dimensional numerical simulation indicates that the Karman vortex street behind the cylinder is generated, when the base flow loses its symmetry around the critical point in the near wake region of the squire cylinder due to the round-off error.
The wake is well stimulated by the disturbance with an angular frequency close to the most unstable frequency of the wake.
The disturbances with an antisymmetric feature are well amplified, even if the angular frequency of the disturbance is far from the most unstable one. Bypassing secondary instability of the wake column structure, Roller-like structures which are often observed in the far wake flow.
A phase diagram of u and v fluctuations in the region indicates a turbulent state.
*This program is supported by KAKENHI.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.MAR.L60.340
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