Experimental study of the effects of surface roughness on the vortex-induced vibration response of a flexible cylinder

Gao, Yun; Fu, Shixiao; Wang, Jungao; Song, Li; Chen, Yifan

doi:10.1016/j.oceaneng.2015.04.052

Cited by 83 publications

(19 citation statements)

References 31 publications

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“…Gao et al [16] summarized the results on the application of surface roughness to control the vortex shedding behind a stationary or oscillating cylinder. According to authors, the researches scenario focuses on determining the pressure distribution, flow separation, and Strouhal number characteristics.…”

Section: Introductionmentioning

confidence: 99%

Numerical experiments of the flow around a bluff body with and without roughness model near a moving wall

Pereira

Oliveira

Moraes

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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Numerical tests at high Reynolds number flows were taken on circular cylinder placed near and parallel to a moving ground. A moving ground running at the same speed as the free stream eliminates the confusing effects of the boundary layer formed on the ground being, therefore, more effective to establish a better understanding of the relationship between complete vortex shedding suppression and surface roughness. A detailed quantitative measurement of the flow field around the cylinder using Lagrangian vortex method with roughness model was carried out. The effect of higher surface roughness heights is studied because it introduces greater instabilities in the boundary layer of bluff bodies. The purpose is to investigate supercritical flow patterns from subcritical Reynolds number flow simulations. The present results are compared against those measured for smooth cylinder under the same flow conditions. It is found that certain critical gap ratio between the rougher cylinder bottom and the moving wall significantly reduces the drag force. The lift force points away from the wall plane. The full vortex shedding suppression is successfully anticipated. In addition, the Strouhal number vanishes. The contribution of this research is to report that von Kámán-type vortex shedding totally ceases and instead two nearly parallel shear layers are formed behind the cylinder in moving ground when employing two-dimensional modeling of roughness. Previous numerical results for flow around smooth cylinder placed closer to the moving ground did not capture the behavior of Strouhal number equal to zero. Unfortunately, there is a lack of experimental results for rough cylinder near a moving wall, which motives the present study.

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Section: Introductionmentioning

confidence: 99%

Numerical experiments of the flow around a bluff body with and without roughness model near a moving wall

Pereira

Oliveira

Moraes

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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show abstract

“…The present paper aims to contribute with more discussions concerning the surface roughness effect on bluff body aerodynamics. An important practical engineering application of the flow around cylindrical structures is that of the fluid-elastic interaction between the flow and the structure exciting the body into flow-induced vibrations (FIV) [2][3][4][5][6]. Undoubtedly, the surface roughness effect must be used to control this non-linear hydrodynamic phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

et al. 2020

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A discrete vortex method is implemented with a hybrid control technique of vortex shedding to solve the problem of the two-dimensional flow past a slightly rough circular cylinder in the vicinity of a moving wall. In the present approach, the passive control technique is inspired on the fundamental principle of surface roughness, promoting modifications on the cylinder geometry to affect the vortex shedding formation. A relative roughness size of ε*/d* = 0.001 (ε* is the average roughness and d* is the outer cylinder diameter) is chosen for the test cases. On the other hand, the active control technique uses a wall plane, which runs at the same speed as the free stream velocity to contribute with external energy affecting the fluid flow. The gap-to-diameter varies in the range from h*/d* = 0.05 to 0.80 (h* is the gap between the moving wall and the cylinder bottom). A detailed account of the time history of pressure distributions, simultaneously investigated with the time evolution of forces, Strouhal number behavior, and boundary layer separation are reported at upper-subcritical Reynolds number flows of Re = 1.0 × 105. The saturation state of the numerical simulations is demonstrated through the analysis of the Strouhal number behavior obtained from temporal history of the aerodynamic loads. The present work provides an improvement in the prediction of Strouhal number than other studies no using roughness model. The aerodynamic characteristics of the cylinder, as well as the control of intermittence and complete interruption of von Kármán-type vortex shedding have been better clarified.

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“…Donde la explicación de sus variables es la siguiente: f(t) -Representa el modelamiento de la señal obtenida del rugosímetro -Frecuencia angular inicial de la señal n -Número de elementos de la expansión T -Periodo de la señal C n -Coeficiente de la serie de Fourier en su forma compleja π -Pi t -tiempo j -coordenada La modelación de la señal es evaluada en términos de los datos proporcionados por el rugosímetro, para aplicar el análisis de la Transformada Rápida de Fourier a la señal adquirida por el rugosímetro, donde se determina el análisis de la rugosidad en términos del valor de sus ordenadas . Además, se aplica las condiciones de Dirichlet para la convergencia de la expansión en serie de Fourier de la función, siendo ésta una función continua, y así converger la señal [17].…”

Section: Transformada Rápida De Fourierunclassified

“…Se obtuvo un valor de: , El mismo que evaluado con el valor de la pantalla del rugosímetro, presenta un error del 0 %. El procedimiento asumido en el estudio permitió evaluar las variables de rugosidades, por GAO [17]. Análisis de transformada rápida de fourier en el cono de la aguja usada del inyector Se considera los datos obtenidos por el rugosímetro como una sucesión de números, los mismos que son considerados como una combinación lineal en términos de funciones trigonométricas o exponenciales, es decir; se obtiene una expansión en serie de Fourier de los elementos de la sucesión donde sus coeficientes proporcionan la amplitud de las funciones sinusoidales, basados en la convergencia absoluta uniforme de la serie, de forma análoga al trabajo realizado por SCHMITT [18].…”

Section: El Cálculo De Raunclassified

Estudio de rugosidad por análisis de Fourier de las toberas de inyectores en sistemas riel común (CRDI)

Navarrete

Román

Cedeño

et al. 2018

Ingeniare. Rev. chil. ing.

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Experimental study of the effects of surface roughness on the vortex-induced vibration response of a flexible cylinder

Cited by 83 publications

References 31 publications

Numerical experiments of the flow around a bluff body with and without roughness model near a moving wall

Numerical experiments of the flow around a bluff body with and without roughness model near a moving wall

Control and Suppression of Vortex Shedding from a Slightly Rough Circular Cylinder by a Discrete Vortex Method

Estudio de rugosidad por análisis de Fourier de las toberas de inyectores en sistemas riel común (CRDI)

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