Control of Flow-Induced Noise Behind a Circular Cylinder Using Splitter Plates

AIAA Journal ◽  
10.2514/2.322 ◽  
1998 ◽  
Vol 36 (11) ◽  
pp. 1961-1967 ◽  
Author(s):  
Donghyun You ◽  
Haecheon Choi ◽  
Myung-Ryul Choi ◽  
Shin-Hyoung Kang
Keyword(s):  
Circular Cylinder ◽  
Splitter Plates ◽  
Flow Induced Noise ◽  
Control Of Flow

Control of flow-induced noise behind a circular cylinder using splitter plates

AIAA Journal ◽  
1998 ◽  
Vol 36 ◽  
pp. 1961-1967 ◽  
Author(s):  
Donghyun You ◽  
Haecheon Choi ◽  
Myung-Ryul Choi ◽  
Shin-Hyoung Kang
Keyword(s):  
Circular Cylinder ◽  
Splitter Plates ◽  
Flow Induced Noise ◽  
Control Of Flow

Active Wake Control of Flow Past a Circular Cylinder with Slot Jet

2021 ◽  
Vol 34 (4) ◽  
Author(s):  
Zhi Deng ◽  
Donglai Gao ◽  
Guanbin Chen ◽  
Wen-Li Chen
Keyword(s):  
Circular Cylinder ◽  
Flow Past ◽  
Control Of Flow

Flow instabilities in the wake of a circular cylinder with parallel dual splitter plates attached

2019 ◽  
Vol 874 ◽  
pp. 299-338 ◽  
Author(s):  
Rui Wang ◽  
Yan Bao ◽  
Dai Zhou ◽  
Hongbo Zhu ◽  
Huan Ping ◽  
...  
Keyword(s):  
Circular Cylinder ◽  
Rear Surface ◽  
Three Dimensional ◽  
Spectral Element ◽  
Cylinder Wake ◽  
Flow Topology ◽  
Weakly Nonlinear ◽  
Plate Length ◽  
Splitter Plates ◽  
Mode A

In this paper, instabilities in the flow over a circular cylinder of diameter $D$ with dual splitter plates attached to its rear surface are numerically investigated using the spectral element method. The key parameters are the splitter plate length $L$, the attachment angle $\unicode[STIX]{x1D6FC}$ and the Reynolds number $Re$. The presence of the plates was found to significantly modify the flow topology, leading to substantial changes in both the primary and secondary instabilities. The results showed that the three instability modes present in the bare circular cylinder wake still exist in the wake of the present configurations and that, in general, the occurrences of modes A and B are delayed, while the onset of mode QP is earlier in the presence of the splitter plates. Furthermore, two new synchronous modes, referred to as mode A$^{\prime }$ and mode B$^{\prime }$, are found to develop in the wake. Mode A$^{\prime }$ is similar to mode A but with a quite long critical wavelength. Mode B$^{\prime }$ shares the same spatio-temporal symmetries as mode B but has a distinct spatial structure. With the exception of the case of $L/D=0.25$, mode A$^{\prime }$ persists for all configurations investigated here and always precedes the transition through mode A. The onset of mode B$^{\prime }$ occurs for $\unicode[STIX]{x1D6FC}>20^{\circ }$ with $L/D=1.0$ and for $L/D>0.5$ with $\unicode[STIX]{x1D6FC}=60^{\circ }$. The characteristics of all the transition modes are analysed, and their similarities and differences are discussed in detail in comparison with the existing modes. In addition, the physical mechanism responsible for the instability mode B$^{\prime }$ is proposed. The weakly nonlinear feature of mode B$^{\prime }$, as well as that of mode A$^{\prime }$, is assessed by employing the Landau model. Finally, selected three-dimensional simulations are performed to confirm the existence of these two new modes and to investigate the nonlinear evolution of the three-dimensional modes.

The Interaction of Porous Metal Coating With the Near Wake of Bluff Body

2012 ◽  
Author(s):  
Hanru Liu ◽  
Jinjia Wei ◽  
Zhiguo Qu
Keyword(s):  
Circular Cylinder ◽  
Bluff Body ◽  
Porous Metal ◽  
Metal Coating ◽  
Wake Flow ◽  
Navier Stokes ◽  
Aerodynamic Forces ◽  
Near Wake ◽  
Drag Forces ◽  
Flow Induced Noise

The flow around a circular cylinder with porous metal coating (PMC) is numerically investigated based on an approach of unsteady Reynolds Averaged Navier-Stokes (URANS) at subcritical Reynolds number. The model validation is carried out through comparison with some available experimental results in the literatures. It is found that the simulated results in the present work coincide well with the experimental data. The interaction of PMC with the near wake of circular cylinder such as streamline, vorticity and shear stress are studied in detail. The result reveals that PMC has capability of manipulating the wake flow so that the near wake of PMC cylinder is substantially different from that of smooth one. In addition, the fluctuations of aerodynamic forces are mitigated effectively. Varying the thickness of porous metal coating causes various velocity distributions and aerodynamic performance of bluff body. When the thickness is appropriate, the drag forces can be reduced to a certain extent. It is expected that the modification of flow characteristic and aerodynamic forces also produces the suppression of flow-induced noise generated by bluff body. These studies on wake flow and analysis of its relationship to flow-induced noise will be useful to understand the mechanism of controlling bluff body flow-induced noise by using PMC and to optimize the PMC for controlling flow and flow-induced noise.

Model for Active Control of Flow-Induced Noise Transmitted Through Double Partitions

AIAA Journal ◽  
2002 ◽  
Vol 40 (6) ◽  
pp. 1113-1121 ◽  
Author(s):  
Cedric Maury ◽  
Paolo Gardonio ◽  
Stephen John Elliott
Keyword(s):  
Active Control ◽  
Flow Induced Noise ◽  
Control Of Flow
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