Visualization of three-dimensional flow structures in the wake of an inclined circular cylinder

Matsuzaki, Kei; Shingai, Mitsuru; Haramoto, Yasutake; Munekata, Mizue; Ohba, Hideki

doi:10.1007/bf03181535

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…At a large yaw angle, such as 45 • , it even becomes a wedge shape lying on the tip end. Compared with the experiments [25], the numerical simulation is consistent with the experimental flow visualization.…”

Section: Wake Vortex Structuresupporting

confidence: 71%

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

Liang

Duan

2019

Applied Sciences

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Numerical simulation is carried out to investigate the effect of the boundary condition of two lateral end-plate walls on the flow structure in the wake of a flow crossing a yawed circular cylinder. Two typical boundary conditions, nonslip and periodic, are investigated. It is revealed that the boundary condition of the two end-plates has a significant effect on the flow behaviors in the wake. Under the nonslip boundary condition, the vortex structure in the wake exhibits a tapering shape to the tip end. The flow pattern is formed in the wake as the streamlines on the tip side are becoming denser while the streamlines on the base end are becoming sparser. Spectral power analysis of the local lift coefficient shows that the frequency distribution exhibits axial variation. On the base side, the frequency distribution is broadband. On the tip side, there are two peak frequencies: the larger one corresponds to the value predicted by the independence principle, and the smaller one is generated by the secondary axial flow separation from the rear cylinder wall. Under the periodic condition, the numerical results show that organized Strouhal vortex is shed in the wake in the same way as to the flow orthogonally passing a cylinder and the independence principle is still applicable.

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Section: Wake Vortex Structuresupporting

confidence: 71%

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

Liang

Duan

2019

Applied Sciences

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“…Ramberg (1983) described the impacts of the inclination angle on a cylinder using the independence principle (IP) or Cosine Law, which stated that the flow with free-stream velocity U past a cylinder with an inclination angle  could be regarded as a normal-incidence case with a flow velocity of cos n UU  = while the contribution from its axial component could be ignored. Matsuzaki et al (2004) experimentally studied the flow past an inclined cylinder in a low-noise wind tunnel with a hydrogen bubble method and pointed out that the Strouhal number deviated from the IP at 15   . Thakur et al (2004) found in their experiment that the wake vortices of a stationary cylinder showed a similar quasi-two-dimensional state for 0 60     .…”

Section: Introductionmentioning

confidence: 99%

The effect of inclination on vortex-induced vibration of a circular cylinder with a base column

Liu

Xiao

et al. 2020

Ocean Engineering

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The vortex-induced vibration (VIV) of an inclined cylinder can be affected by its end condition. This paper numerically investigates the effect of inclination on the VIV of an elastically mounted rigid cylinder with a base column, which derives from a floating offshore wind turbine (FOWT). The numerical methods are validated against an existing VIV study of a finite-length cylinder. Two inclination angles, i.e. -5° and -10°, are studied to simulate the relatively small wind-induced inclination experienced by FOWTs. Results from stationary simulations show that differences between the force coefficients of inclined and upright cylinders are rather small. Nevertheless, contrary to the finding from previous VIV studies that the effect of inclination on the response of a cylinder with small inclination angles is limited, the present investigation reveals that the maximum response amplitude of the cylinder increases by about 20% when the inclination angle grows to -10° due to the presence of the base column.Meanwhile, the inclination leads to a reduction in the width of the lock-in regime. The impacts of inclination are further discussed via forced vibration studies with same oscillation parameters, which show that the upper part of the cylinder is more affected by the inclination compared to the base column with a considerable decrease in the amplitude of lift coefficient. The discrepancies in fluid forces are substantiated by analysing the pressure distribution on specified spanwise sections of the cylinder surface.

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“…Matsuzaki et al (2004) employed hydrogen bubble method for visualization of flow structures in the wake of an inclined circular cylinder. Jang et al (2007) investigated turbulent structure in the wake of a sphere using smoke-wire method.…”

Section: Introductionmentioning

confidence: 99%

Flow visualization and local mass transfer studies for turbulent flow in a wind tunnel with chamfered ribs

Karwa

Maheshwari

Karwa

2008

J Vis

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The paper presents results of flow visualization and mass transfer studies for fully developed turbulent flow of air in a square section wind tunnel with repeated chamfered rib roughness on the bottom of the tunnel (rib head chamfer angles φ of -15 o , 0 o , and 15 o ; relative roughness pitch p/e = 3, 5, 7.5, and 10). Direct video recordings of flow patterns were made using a simple technique of particles visualization. For the positively chamfered closely spaced ribs (p/e ≤ 5) vigorous vortex shedding has been seen compared to the square or negatively chamfered ribs, which is found to be a function of the Reynolds number. For the widely spaced ribs, the study shows flow separation at the ribs and reattachment in the inter-rib region. Local mass transfer studies, based on the variation in colour of cobaltous chloride solution impregnated paper due to evaporation of water, showed a significant improvement in mass transfer rate in the recirculating region in the wake of ribs with the change in the chamfer angle from -15 o to 15 o . The positively chamfered 15 o ribs are found to be better than square section ribs at p/e ≤ 7.5. The performance of negatively chamfered ribs is found to be poor compared to other ribs irrespective of the relative roughness pitch.

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Visualization of three-dimensional flow structures in the wake of an inclined circular cylinder

Cited by 13 publications

References 10 publications

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

Effect of Lateral End Plates on Flow Crossing a Yawed Circular Cylinder

The effect of inclination on vortex-induced vibration of a circular cylinder with a base column

Flow visualization and local mass transfer studies for turbulent flow in a wind tunnel with chamfered ribs

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