Investigation of the three-dimensional turbulent near-wake structure past a flat plate by tomographic PIV at high Reynolds number

Deri, Enrico; Braza, Marianna; Cid, Emmanuel; Cazin, Sébastien; Michaelis, Dirk; Degouet, Cédric

doi:10.1016/j.jfluidstructs.2012.11.005

Cited by 15 publications

(5 citation statements)

References 27 publications

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“…Tandalam et al (2010) used the most energetic POD modes to reconstruct a turbulent jet flow and showed that it is possible to filter out small coherent structures according to the considered number of modes. Similar findings have also been found by Deri et al (2014), while Raiola et al (2015) proposed an application of the POD to filter out the random error component of PIV. New variants of the POD algorithm have recently proposed to improve the detection of coherent structures and the separation of their respective scales by expressing the POD in the frequency domain (Towne et al 2018) and by optimizing modes within a target frequency range (Mendez et al 2020).…”

Section: Introductionsupporting

confidence: 81%

Experimental investigation of turbulent coherent structures interacting with a porous airfoil

et al. 2021

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The flow field on solid and porous airfoils subjected to turbulence shed by an upstream cylindrical rod and the corresponding far-field noise radiations are studied through particle image velocimetry (PIV) and microphone measurements, respectively. Three different Reynolds numbers based on the rod diameter are considered in a range between 2.7 × 10 4 and 5.4 × 10 4 , and two porous airfoil models are tested to analyze the influence of the design elements of the permeable treatment. A standard proper orthogonal decomposition (POD) algorithm is employed to band filter the different length scales that characterize the turbulent flow, making it feasible to determine which turbulence scales are affected by porosity. The aeroacoustic results indicate that the porous treatment of the wing profile leads to a noise reduction at low frequencies and a noise regeneration at high frequencies due to surface roughness. The investigation on the flow field shows that the main effect of porosity is to mitigate the turbulent kinetic energy in the stagnation region, attenuating the distortion of turbulence interacting with the airfoil surface. The application of the POD algorithm indicates that this effect acts mainly on the largest scales of turbulence.

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Section: Introductionsupporting

confidence: 81%

Experimental investigation of turbulent coherent structures interacting with a porous airfoil

et al. 2021

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“…142 Nakagawa et al 143 highlighted that for low side ratios (W/H = 0.5, 1), the separated shear layers at the leading-edges penetrate into the rear side of cylinders, whereas at higher side ratios (W/H = 3), they reattach onto the side walls. The fluid flow behind an inclined flat plate (SR << 1) at a high Reynolds number of 200,000 was investigated by Deri et al 144 using tomographic PIV.…”

Section: Rectangular Cylindersmentioning

confidence: 99%

A review of experiments on stationary bluff body wakes

Feshalami

Scarano

et al. 2022

Physics of Fluids

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Experimental studies dealing with the wake of isolated stationary bluff-bodies are reviewed. After briefly recalling the pioneering works in this domain, the paper focuses on recent research conducted with the latest experimental methods and techniques. The review encompasses a range of topics, including, the effects of bluff-body geometry (non-circular cross sections and nonuniformity in spanwise direction), steady and unsteady (periodic and non-periodic) inflow conditions; surface proximity (rigid wall, confinement and water free surface) and non-Newtonian fluids. Focus is brought to the flow physics of the wakes, including especially the complex threedimensional and oscillatory behaviours induced by the periodic vortex shedding phenomenon. The paper aims to offer a critical and systematic review of new knowledge and findings on the subject area, as well as emerging? and the most frequently adopted experimental techniques. The review also helps identifying knowledge gaps in the literature that need to be addressed in future investigations.

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“…The configuration is defined by a previous experimental study performed at the Institut de Mécaniques des Fluides de Toulouse (E. Deri et al [2]). The experiment involves a flat plate (cf.…”

Section: Configurationmentioning

confidence: 99%

“…The experiments (cf. figure 2) have been carried out in the S4 wind tunnel and the results are obtained by 3D tomographic PIV (E. Deri et al 2012 [2]) for a rigid plate (without deformation). The Proper Orthogonal Decomposition (POD) was performed and the higher modes show the Von Karman pattern.…”

Section: Configurationmentioning

confidence: 99%

Dynamic Effect of an Active Deformable Flat Plate on Its Turbulent Flow

Deloze

Hoarau

Chinaud

et al. 2016

Notes on Numerical Fluid Mechanics and Multidisciplinary Design

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This paper addresses the topic of the influence of the profile of a plate on a turbulent flow. The study is based on numerical results obtained by URANS and hybrid (DDES) turbulence modeling and compared with experimental results. The flat plate has an aspect ratio of 20 (length over thickness) and the edges are not smoothed. The plate includes Shape Memory Alloys (SAM) , which allows it to arch under the effect of an electric voltage. The deformation by the material corresponds to a beam deformation and is implemented in the numerical simulation according to this definition. The Reynolds number is Re = 200.000 , which led to a turbulent flow with a Von Karman vortex shedding and Kelvin Helmotz instabilities in the shear layer. The simulations are performed with several turbulence models: k-OES, k-ω-BSL-OES, k-ω-DDES-BSL-OES, kω-DDES-SST-Menter. These models are used in a first step to determine the three-dimensional flow around the plate plane inclined by 10 degrees. The behavior of the flow are found similar between experiment and numerical simulations. The purpose of the curve shape by deformation is then compared to a linear form by rotation of the plate. The curved shape provides the same lift coefficient with less required deformation and thus with a lower drag coefficient and also a lower frequency. The dynamic deformation is slow compared to the freestream velocity, it weakly affects the coefficients and frequencies compared to linear shape.

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Investigation of the three-dimensional turbulent near-wake structure past a flat plate by tomographic PIV at high Reynolds number

Cited by 15 publications

References 27 publications

Experimental investigation of turbulent coherent structures interacting with a porous airfoil

Experimental investigation of turbulent coherent structures interacting with a porous airfoil

A review of experiments on stationary bluff body wakes

Dynamic Effect of an Active Deformable Flat Plate on Its Turbulent Flow

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