Drag suppression for 2D oscillating cylinder with various arrangement of splitters at Re =100: A high-amplitude study with OpenFOAM

Amiraslanpour, Mojtaba; Ghazanfarian, Jafar; Razavi, Seyed Esmail

doi:10.1016/j.jweia.2017.02.018

Cited by 19 publications

(7 citation statements)

References 40 publications

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“…The present findings are consistent with the results obtained by Ogunremi and Sumner [49]. The presence of splitter plate shows the way to a considerable decrease of the vorticity magnitude and turbulent kinetic energy [32], [43], and in turn, reduces flow-induced sound [57]. When the splitter plate length of the modified cylinder L/D = 3.5, the drag and sound emission reduce by about 22.95%and 2.1 dB, respectively.…”

Section: B Validation Of Aerodynamic and Aeroacoustic Parameterssupporting

confidence: 92%

“…Comparing the StT(see Table 3) with the St(see Table 2), it is clear that the peak sound frequency takes place at the dominant vortex shedding frequency, which means the dominant role of vortex shedding on aeroacoustic sound generation. So, by amending the vortical flow structures in the cylinder wake, the sound production can be controlled [43] and this is what a cylinder retrofitted with a splitter plate does. In the present work, ten square cylinders attached with splitter plate models with different L/D, also called the 'design variables' in the context of optimisation (see Fig.…”

Section: B Validation Of Aerodynamic and Aeroacoustic Parametersmentioning

confidence: 99%

“…The values of instantaneous turbulent kinetic energy in the near-wake (downstream) of a cylinder with optimal splitter plate are smaller ( Fig. 11) [32], [43], which is the main cause for sound mitigation [57]. The results highlight that considerable improvement in aerodynamic and aeroacoustic performance of square cylinder with a splitter plate is possible as a result of…”

Section: B Validation Of Aerodynamic and Aeroacoustic Parametersmentioning

confidence: 99%

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Multi-Objective Drag and Sound Optimization of Square Cylinder Retrofitted with Splitter Plate

2019

IJRTE

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The application of a splitter plate on square cylinders to reduce drag in cross-flow is an active research area. However, the associated aeroacoustic sound in the surrounding fluid also undergoes reduction, an aspect which has received less attention. This paper presents a numerical methodology for coupled aerodynamic and aeroacoustic calculations for flow past square cylinders with various splitter plate lengths. Computations are performed at a Re of 22000 using URANS technique and FW-H analogy. Observing that drag reduction and sound reduction occur at different splitter plate lengths, a two-objective optimization problem is posed to minimize the drag and OASPL simultaneously

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Section: B Validation Of Aerodynamic and Aeroacoustic Parameterssupporting

confidence: 92%

Section: B Validation Of Aerodynamic and Aeroacoustic Parametersmentioning

confidence: 99%

Section: B Validation Of Aerodynamic and Aeroacoustic Parametersmentioning

confidence: 99%

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Multi-Objective Drag and Sound Optimization of Square Cylinder Retrofitted with Splitter Plate

2019

IJRTE

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“…Aitken's underrelaxation constants are adjusted dynamically based on the acceleration of the rigid body, thus improving stability. This type of simulations with deformable grids, applied to fluidstructure interaction using OpenFOAM solvers have been tested in the past with complex problems, such as drag reduction [38], flow and deformation in arteries [39], bluff body oscillations [40], or offshore floating platforms [41]).…”

Section: Numerical Simulationsmentioning

confidence: 99%

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Balam-Tamayo

Málaga

Figueroa-Espinoza

2020

JMSE

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The performance and flow around an oscillating foil device for current energy extraction (a wingmill) was studied through numerical simulations. OpenFOAM was used in order to study the two-dimensional (2D) flow around a wingmill. A closed loop control law was coded in order to follow a reference angle of attack. The objective of this control law is to modify the angle of attack in order to enhance the lift force (and increase power extraction). Dimensional analysis suggests a compromise between the generator (or damper) stiffness and actuator/control gains, so a parametric study was carried out while using a new dimensionless number, called B, which represents this compromise. It was found that there is a maximum on the efficiency curve in terms of the aforementioned dimensionless parameter. The lessons that are learned from this fluid-structure and feedback coupling are discussed; this interaction, combined with the feedback dynamics, may trigger dynamic stall, thus decreasing the performance. Moreover, if the control strategy is not carefully selected, then the energy spent on the actuator may affect efficiency considerably. This type of simulation could allow for the system identification, control synthesis, and optimization of energy harvesting devices in future studies.

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“…When the Reynolds numbers are 1000 and 30000, respectively, changing / = 0.5∼2.0 to simulation can be found to reduce the drag coefficient, lift coefficient, and vortex shedding frequency. This document of Amiraslanpour et al [4] is used to study the two splitter plate in the upstream or downstream stages of the cylinder. They found the influence of the splitter plate on the drag force of the cylinder.…”

Section: Introductionmentioning

confidence: 99%

Structure Optimization of a Vibration Suppression Device for Underwater Moored Platforms Using CFD and Neural Network

Mao

Zhao

2017

Complexity

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We only consider the underwater mooring platform (UMP) and the plate moving in the transverse direction, and the plate can be relative to the UMP free rotation. In the case of constant flow rate ( = 1 m/s), the effect of different dimensionless plate length ( / ) and damping value ( ) on the UMP was studied. We get the sample data point set by computational fluid dynamics (CFD) simulation with changing the dimensionless plate length ( / = 0.3, 0.5, 0.75, 1.0, 1.25, 1.5) and damping value ( = 50, 75, 100, 125, 175, 250, 300 (N × s/m)). The optimal value of the vibration suppression rate is obtained by backpropagation (BP) neural network and genetic algorithm. The optimal vibration suppression rate is = 0.9878 and the corresponding variable value is / = 1.0342, = 57.9631 (N × s/m). In order to verify the accuracy of the optimization, we perform the CFD numerical simulation with the optimized parameters and compare the theoretical optimization results with the CFD simulation result. The absolute error between CFD simulation and optimal is only 0.0037. Finally, we compare the results of CFD simulation based on optimal parameter with the bare UMP and analyze their dimensionless amplitude, wake structure, and lift coefficient. It is shown that BP neural network and generic algorithm are effective.

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Drag suppression for 2D oscillating cylinder with various arrangement of splitters at Re =100: A high-amplitude study with OpenFOAM

Cited by 19 publications

References 40 publications

Multi-Objective Drag and Sound Optimization of Square Cylinder Retrofitted with Splitter Plate

Multi-Objective Drag and Sound Optimization of Square Cylinder Retrofitted with Splitter Plate

Numerical Study of an Oscillating-Wing Wingmill for Ocean Current Energy Harvesting: Fluid-Solid-Body Interaction with Feedback Control

Structure Optimization of a Vibration Suppression Device for Underwater Moored Platforms Using CFD and Neural Network

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