Flow control of the wake vortex street of a circular cylinder by using a traveling wave wall at low Reynolds number

Xu, Feng; Chen, Wen Li; Bai, Weifeng; Xiao, Yingying; Ou, Jinping

doi:10.1016/j.compfluid.2016.11.014

Cited by 33 publications

(8 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Both computational and experimental work has grown around the use of small amplitude traveling waves on aerodynamic or hydrodynamic surfaces for boundary layer control and drag reduction. This work has demonstrated significant drag reductions over a wide range of Reynolds numbers so long as the wave speed moderately exceeds the free stream speed [5,29,32,[35][36][37]. In these cases, the energy required to drive the traveling waves can be made to be significantly less than the energy savings from drag reduction.…”

Section: Introductionmentioning

confidence: 92%

Fabrication and characterization of folded foils supporting streamwise traveling waves

Calisch

Fan

Jodin

et al. 2019

Journal of Fluids and Structures

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 92%

Fabrication and characterization of folded foils supporting streamwise traveling waves

Calisch

Fan

Jodin

et al. 2019

Journal of Fluids and Structures

View full text Add to dashboard Cite

“…When the fluid flows over the spoiler cylinder, according to the calculation formula of Reynolds number, = (v takes the values of 1-30 m/s; The Kármán vortex street effect occurs when the fluid passes through a cylinder. At this time, the shedding frequency of the fluid vortex in the flow channel [35] is:…”

Section: Simulation Verification Of the Value Of Resistance Coefficientmentioning

confidence: 99%

“…Simplified flow field model of the main cavity.The Kármán vortex street effect occurs when the fluid passes through a cylinder. At this time, the shedding frequency of the fluid vortex in the flow channel[35] is:…”

mentioning

confidence: 99%

Study on the Critical Wind Speed of a Resonant Cavity Piezoelectric Energy Harvester Driven by Driving Wind Pressure

Xia

Liu

et al. 2019

Micromachines

View full text Add to dashboard Cite

In order to solve the problem of continuous and stable power supply for vehicle sensors, a resonant cavity piezoelectric energy harvester driven by driving wind pressure was designed. The harvester has an effective working range of wind speed. According to the energy conservation law, the cut-in (initial) wind speed of the harvester was solved. The pressure distribution law of the elastic beam in the flow field was studied by the Fluent software package, and the results were loaded into a finite element model with a method of partition loading. The relationship between the wind speed and the maximum principal stress of the piezoelectric cantilever beam was analyzed, and the critical stress method was used to study the cut-out wind speed of the energy harvester. The results show that the cut-in wind speed of the piezoelectric energy harvester is 5.29 m/s, and the cut-out wind speed is 24 m/s. Finally, an experiment on the power generation performance of the energy harvester was carried out. The experimental results show that the cut-in and cut-out wind speeds of the piezoelectric energy harvester are 5 m/s and 24 m/s, respectively, and the best matching load is 60 kΩ. The average output power, generated by the harvester when the driving wind speed is 22 m/s, is 0.145 mW, and the corresponding power density is 1.2 mW/cm 3 .

show abstract

“…Shear layer excitation has potential to manipulate the circulation generation and transport to exploit flow instabilities to alter the shedding process (Xu et al, 2017). The square cross-sectional prism was selected to isolate the influence of actuation by fixing the separation point and avoiding downstream shear layer reattachment.…”

Section: Introductionmentioning

confidence: 99%

Moving Surface Actuation, Effects of Frequency-based Shear Layer Excitation on the Response of a Bluff Body Wake

Singbeil

Ghiroaga

Morton

et al. 2021

ISPIV21

View full text Add to dashboard Cite

The effect of actuation frequency, using moving surface actuation, is investigated for a square cylinder bluff body wake. Pressure sensor data are used to optimize actuation characteristics through the implementation of an NSGA-II evolutionary algorithm. Velocity field data are obtained using Particle Image Velocimetry (PIV) for baseline and optimized actuation cases. A Proper Orthogonal Decomposition (POD) analysis shows that the vortex shedding frequency shifts between frequencies associated with the actuation, moving between regions of lock-on and quasi-periodicity. Additionally, the POD shows that the energy contained in the coherent shedding motion is reduced through actuation, while the total energy in the velocity field stays relatively constant. A reconstruction of the first 10 POD modes indicates that the coherent contribution to the Reynolds stresses significantly decreases compared to the non-actuated case. The mechanism for drag reduction is investigated using the shed circulation flux and Kochin’s drag formulation model. The drag obtained using PIV measurements and Kochin’s formulation is consistent with trends observed for the base pressure as a function of actuation frequency.

show abstract

Flow control of the wake vortex street of a circular cylinder by using a traveling wave wall at low Reynolds number

Cited by 33 publications

References 25 publications

Fabrication and characterization of folded foils supporting streamwise traveling waves

Fabrication and characterization of folded foils supporting streamwise traveling waves

Study on the Critical Wind Speed of a Resonant Cavity Piezoelectric Energy Harvester Driven by Driving Wind Pressure

Moving Surface Actuation, Effects of Frequency-based Shear Layer Excitation on the Response of a Bluff Body Wake

Contact Info

Product

Resources

About