Wind-Tunnel Investigation of the Aerodynamic Performance of Surface-Modification Cables

Katsuchi, Hiroshi; Yamada, Hitoshi; Sakaki, Ippei; Okado, Eiichi

doi:10.1016/j.eng.2017.09.001

Cited by 14 publications

(3 citation statements)

References 4 publications

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“…Comparisons of the effects of helical fillets and pattern indentation can be found in. 21,22 However, pattern indentation and parallel protuberances can sometimes amplify both phenomena. 23 Additionally, Ref.…”

Section: The Unsteady Aerodynamic Forces Acting On Circular Cylinders...mentioning

confidence: 99%

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Benidir¹,

Eng.

Prof.

et al. 2021

Structural Engineering International

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Slender structures with circular cylindrical cross-sections are very common in civil engineering, industrial equipment and bridge engineering. Such long cylinders subjected to wind are columns, piles, long cables, chimney, pylons and others. On long cables, an instability called dry galloping has been recently theorized to be linked to an unpredictable jump state occurring once the boundary layers of the circular cylinder changes from laminar to turbulent. With a non-stationary character, the force generated at the critical flow regime is named bi-stable activity. In this work, the birth of bi-stable flow activity around a circular cylinder made of high-density polyethylene is studied experimentally in a wind tunnel. The pressure pattern is linearly decomposed and geometric modes governing the bi-stable activity as a function of circularity defect are created. The results show that the energy of the nonstationary load observed at the critical flow regime depends strongly on the circularity defect. Furthermore, the inclination angle of 60°confers a significant increase in the energy of the bi-stable flow mode when an unsteady asymmetric reattachment event occurs. The paper also highlights the variability of the mean drag coefficient as a function of the macroscopic defect.

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Section: The Unsteady Aerodynamic Forces Acting On Circular Cylinders...mentioning

confidence: 99%

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Benidir¹,

Eng.

Prof.

et al. 2021

Structural Engineering International

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“…Researchers have tried ways to modify the surface configuration of steel cables and achieved great success. Typical approaches involved altering cable surface roughness 19 , 20 , incorporating surface indentations 21 , 22 , helical or longitudinal ridges 22 – 26 , grooved textures 27 and wire meshes 28 – 30 . However, the above efforts all concentrated on steel cables.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic performance and wind-induced response of carbon fiber-reinforced polymer (CFRP) cables

Long,

Sun,

Shang

et al. 2024

Sci Rep

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To study the aerodynamic performance and wind-induced response of carbon fiber-reinforced polymer (CFRP) cables, CFRP cable was designed by replacing a steel cable in a tied arch bridge based on stiffness, strength and area equivalent criteria, respectively. The aerodynamic performance and wind-induced response of CFRP cable and steel cable were studied and compared by computational fluid dynamics (CFD) model. Based on the computational results, optimal cable replacement criterion was proposed for CFRP cable to replace steel cable. In addition, surface modification was conducted by engrooving vertical symmetric (VS), vertical asymmetric (VA) and helical symmetric (HS) V-shaped grooves to improve the aerodynamic performance and wind-induced response of CFRP cable. Results showed that CFRP cables exhibited inferior aerodynamic performance and wind-induced response in most cases. However, CFRP cable based on stiffness equivalent criterion exhibited better aerodynamic performance and wind-induced vibration properties compared to the other two cable replacement criteria, thus is regarded as the optimal substitute for steel cable. In addition, HS grooves generated symmetric disturbances and caused approximately equivalent boundary layer separation delays uniformly and continuously along the cable length, thus exhibiting better effect in decreasing the reverse flow region, the maximum negative flow velocity, the vortex shedding frequency and the wind-induced vibration amplitude of CFRP cable. Hence, the stiffness equivalent criterion combined with surface modification with HS V-shaped grooves was proposed to replace steel cable with CFRP cable. This study can provide insights into the aerodynamic performance and wind-induced response of CFRP cable and instructions for cable replacement practice.

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“…However, the formation and oscillation of an upper cable rivulet is deemed to be the main factor of RWIVs (Verwiebe and Ruscheweyh, 1998;Peil and Nahrath, 2003;Gu and Du, 2005). On different grounds, the aerodynamic drag force is a decisive parameter in the overall design of a cable-supported bridges, and efforts have been made to generate countermeasures effective in mitigating RWIVs that also keep the drag coefficient at a minimum (Kleissl and Georgakis, 2011;Katsuchi et al, 2017). With all these in mind, it is important to establish a theoretical model and do thorough numerical analysis on the mitigation mechanism of longitudinal ribs encapsulating also their developing aerodynamic forces.…”

Section: Introductionmentioning

confidence: 99%

Mitigation mechanism of longitudinal ribs on rain-wind induced vibrations of stay cables

Qiao

Nikitas

et al. 2019

Fluid Dyn. Res.

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Wind-Tunnel Investigation of the Aerodynamic Performance of Surface-Modification Cables

Cited by 14 publications

References 4 publications

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Aerodynamic Instability of Circular Slender Structures Due to Bistable Flow Activity

Aerodynamic performance and wind-induced response of carbon fiber-reinforced polymer (CFRP) cables

Mitigation mechanism of longitudinal ribs on rain-wind induced vibrations of stay cables

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