Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Shadaram, Abdollah; Fard, Mahdi Azimi; Rostamy, Noorallah

doi:10.3844/ajassp.2008.917.926

Cited by 29 publications

(7 citation statements)

References 11 publications

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“…The number is sufficient to capture the features of the transitional flow accurately. For example, the computed Strouhal number (St = f d/U 0 , f is the shedding frequency) was about 0.127, a value close to those obtained in several experimental and numerical studies (see for examples Durão, Heitor & Pereira 1988;Liou, Chen & Hwang 2002;Shadaram, Fard & Rostamy 2008).…”

Section: Computational Domain and Boundary Conditionssupporting

confidence: 83%

Momentum and heat transport in a three-dimensional transitional wake of a heated square cylinder

Djenidi

Antonia

2009

J. Fluid Mech.

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The transport of momentum and a passive scalar (temperature) in a three-dimensional transitional wake of a heated square cylinder has been carried out through direct numerical simulations using the lattice Boltzmann method at a Reynolds number Rd = 200 (d is the cylinder diameter) and a Prandlt number of 0.7. The simulations shows that while momentum and heat are transported by vortical structures, heat is in general more effectively transported than momentum. It is argued that the nature of the structural flow is responsible for the longitudinal heat flux uθ being larger than the lateral one vθ in the wake region extending up to 45d. It was shown that a gradient transport model could, to a first-order approximation, be used to model uv but would be less accurate for modelling vθ. Also the Reynolds analogy between momentum and heat transports is not verified in this flow. The fluctuating temperature field presents thermal structures similar to the velocity structures with, however, a different spatial organization. In addition the analogy between fluctuating turbulent kinetic energy and the temperature variance is relatively well satisfied throughout the wake flow.

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Section: Computational Domain and Boundary Conditionssupporting

confidence: 83%

Momentum and heat transport in a three-dimensional transitional wake of a heated square cylinder

Djenidi

Antonia

2009

J. Fluid Mech.

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“…Experimental work has been done in wind tunnels or water channels to determine aerodynamics, loads, and vortex shedding frequencies in its wakes by Norberg [1], Awbi [2], Deniz and Staubli [3], Kim et al [4], Matsumoto et al [5], Mills et al [6], Nakamura and Yoshimura [7], Shadaram et al [8], Nakamura and Ohya [9], Nakaguchi et al [10], and Washizu et al [11]. Some researchers combined measurements with flow visualizations to provide information about flow structures near the solid body; see, e.g., Okajima [12].…”

Section: Introductionmentioning

confidence: 98%

Turbulent Flow Around a Semi-Submerged Rectangular Cylinder

Arslan

Malavasi

Pettersen

et al. 2013

Journal of Offshore Mechanics and Arctic Engineering

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The present work is motivated by phenomena occurring in the flow field around structures partly submerged in water. A three- dimensional (3D) unsteady flow around a rectangular cylinder is studied for four different submergence ratios by using computational fluid dynamics (CFD) tools with the large eddy simulation (LES) turbulence model. The simulation results are compared to particle image velocimetry (PIV) measurements at the Reynolds number Re¼12,100 and the Froude number Fr¼0.26. The focus in our investigation is on the characterization of the behavior of vortex structures generated by separated flow. Another target in the study is to obtain a better knowledge of the\ud hydrodynamic forces acting on a semi-submerged structure. The computed force coefficients are compared with experimental measurements

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“…For all the tests, the normalized streamwise velocity ⁄ downstream of the plant was lower than the ambient velocity, exhibiting a reduction in velocity as typically observed in the wake of bluff bodies (Tritton, 1977). The inflection on the velocity profile has been observed in analogous studies with rigid cylinder and porous obstructions (Shadaram et al, 2008). The presence of the inflection point makes the flow susceptible to the instability of von Kármán (Zong and Nepf, 2012).…”

Section: Effects Of Reconfigurationmentioning

confidence: 60%

Impact of reconfiguration on the flow downstream of a flexible foliated plant

Maio

Marini

Fontana

et al. 2022

Journal of Hydrology and Hydromechanics

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This paper explores the impacts of reconfiguration and leaf morphology on the flow downstream of a flexible foliated plant. 3D acoustic Doppler velocimetry and particle image velocimetry were used to experimentally investigate the hydrodynamic interaction between a foliated plant and the flow, testing two plants with different leaves morphology under different bulk flow velocities. The model vegetation was representative of riparian vegetation species in terms of plants hydrodynamic behavior and leaf to stem area ratio. To explore the effects of the seasonal variability of vegetation on the flow structure, leafless conditions were tested. Reconfiguration resulted in a decrease of the frontal projected area of the plants up to the 80% relative to the undeformed value. Such changes in plant frontal area markedly affected the spatial distributions of mean velocity and turbulence intensities, altering the local exchanges of momentum. At increasing reconfiguration, the different plant morphology influenced the mean and turbulent wake width. The leafless stem exhibited a rigid behavior, with the flow in the wake being comparable to that downstream of a rigid cylinder. The study revealed that the flexibility-induced reconfiguration of plants can markedly affect the local distribution of flow properties in the wake, potentially affecting transport processes at the scale of the plant and its subparts.

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Experimental Study of Near Wake Flow Behind a Rectangular Cylinder

Cited by 29 publications

References 11 publications

Momentum and heat transport in a three-dimensional transitional wake of a heated square cylinder

Momentum and heat transport in a three-dimensional transitional wake of a heated square cylinder

Turbulent Flow Around a Semi-Submerged Rectangular Cylinder

Impact of reconfiguration on the flow downstream of a flexible foliated plant

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