Hydrodynamic coefficients of a yawed square cylinder in oscillatory flows

Lou, Xiaofan; Zhou, Tongming; Cheng, Liang

doi:10.1016/j.oceaneng.2016.11.038

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…2 shows the drag coefficients of a circular and a square cylinder for 0° as an initial validation of the experimental setup. This figure was previously shown and discussed in [12]. It can be seen that the present drag coefficient reveals a satisfactory agreement with the previous experimental results at approximately the same numbers [13], [14] for a circular cylinder or at different numbers [6], [15] for a square cylinder.…”

Section: Resultssupporting

confidence: 92%

“…In Fig. 6 of the previously reported results [12], it has been shown that when KC < 6, IP is valid. However, for KC = 820, the departure of at 30° and 45° from that of 0° is very apparent.…”

Section: Resultsmentioning

confidence: 68%

“…In a previous study by this research group [7], the validity of IP of an inclined square cylinder in steady flow has been evaluated at a Reynolds number of 7,000. In a more recent study by this group, the validity of IP of an inclined square cylinder in oscillatory flows was also examined in terms of the force coefficients and Strouhal number [12]. It was found that the IP for an inclined square cylinder in oscillatory flow is not valid for KC in the range of 8-20, at least when is larger than 30°.…”

Section:  Cos  Itsmentioning

confidence: 99%

“…However, in this paper, only flow fields for 0° and 45° will be shown. This study aims to explore the mechanism for the invalidity of IP for KC in the range of 8-20 [12]. The influence of the cylinder inclination angle on the formation, shedding and evolution of the vortices around the cylinder are studied by evaluating the phase-averaged vorticity patterns at different yaw angles and different KC numbers using PIV technique.…”

Section:  Cos  Itsmentioning

confidence: 99%

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Experimental Investigation of Flow Field Around an Inclined Square Cylinder Under Forced Oscillation

Zhou

Lou

2018

Advances in Fluid Mechanics XII

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Flow structures in the wake of a square cylinder inclined with angles of  = 0, 15, 30 and 45 undergoing forced oscillation are investigated experimentally using particle image velocimetry (PIV) at Keulegan-Carpenter (KC) numbers in the range of 5-30 to examine the performance of the Independent Principle (IP). For KC < 6, there is no vortex shedding from the cylinder for all angles and as a result, the IP is valid. For KC 820, IP does not work satisfactorily because at large inclination angles, the shear layers are stretched and reattach to the upper and lower sides of the cylinder body for most of the time within one oscillating cycle. When KC is increased further to 25, the phenomenon of shear layer attachment when the cylinder is at the neutral position, as well as the significant shedding at the end of each half cycle, indicate a similar flow field for both vertical and inclined cylinders. The present investigation indicates that the IP is valid when KC  6 and KC  20 as it is analogous to a steady current.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 68%

Section:  Cos  Itsmentioning

confidence: 99%

Section:  Cos  Itsmentioning

confidence: 99%

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Experimental Investigation of Flow Field Around an Inclined Square Cylinder Under Forced Oscillation

Zhou

Lou

2018

Advances in Fluid Mechanics XII

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“…The flow-around motion of submerged structures is a classical subject in hydrodynamics, and the resistance equation for hydropower and coastal engineering problems has previously been summarized [29,30]. As a type of water blocking structure, the TCC induces similar hydrodynamic characteristics as those of flow-around motion.…”

Section: Resistance Equationmentioning

confidence: 99%

Simulation and Experimental Analysis on the Load Characteristics of a Temperature-Control Curtain in a Thermally-Stratified Reservoir

et al. 2020

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Low-temperature discharged water from thermally-stratified reservoirs in spring and summer will have a negative environmental impact on fish breeding and agricultural irrigation downstream. The temperature-control curtain (TCC) is a selective withdrawal structure that can effectively change the discharged water temperature. Compared with a traditional selective withdrawal project, a TCC project has the advantages of low cost and simple construction and can even be added to operating reservoirs without impacting power generation. Analysis of the load characteristics is the key to the application of TCC engineering. This paper establishes a three-dimensional numerical model simulation and verifies it with physical model experimental results. The crucial parameters affecting the load characteristics of TCC are investigated, including the water blocking rate, area ratio, inclination ratio, inflow velocity, and water temperature stratification ratio. The results show that: (1) This numerical simulation approach can be used to predict the drag coefficient and the load of a TCC; (2) the water blocking rate has the greatest influence on the drag coefficient, and it is the most critical indicator of the TCC load; and (3) the drag coefficient exponentially increases with an increasing water blocking rate, quadratically increases with an increasing area ratio, linearly increases with an increasing inclination ratio, and linearly increases with an increasing water temperature stratification ratio.

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Experimental investigation on vortex-induced vibrations of a hang-off evacuated drilling riser

2020

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Hydrodynamic coefficients of a yawed square cylinder in oscillatory flows

Cited by 10 publications

References 21 publications

Experimental Investigation of Flow Field Around an Inclined Square Cylinder Under Forced Oscillation

Experimental Investigation of Flow Field Around an Inclined Square Cylinder Under Forced Oscillation

Simulation and Experimental Analysis on the Load Characteristics of a Temperature-Control Curtain in a Thermally-Stratified Reservoir

Experimental investigation on vortex-induced vibrations of a hang-off evacuated drilling riser

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