Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Maruai, Nurshafinaz Mohd; Ali, Mohamed Sukri Mat; Ismail, Mohamad Hafiz; Zaki, Sheikh Ahmad

doi:10.1177/1077546317707877

Cited by 14 publications

(8 citation statements)

References 38 publications

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“…In fact, Cui et al [27] also has shown the similar results, where in their study, cylinder of α=22.5° had lower VIV amplitude compared to the others. Next, a region free from VIV and galloping was found at reduced velocity in the range of 10 ≤ UR ≤ 15 for α=0°, which is in agreement with Maruai et al [26]. Therefore, it can be said that for a square cylinder, a tranquil zone was found between the phenomena of VIV and galloping.…”

Section: Effect Of the Angle Of Attacksupporting

confidence: 89%

“…In their study, they stated that for an isolated square cylinder, only two significant flow-induced vibration behaviours can be observed, namely, VIV that occurs at lower branch velocity and galloping that occurs at higher branch velocity. To verify the data of the present study, the existing amplitude ratio of an isolated square cylinder [26] was compared with the square cylinder response of the present study, as shown in Fig. 9.…”

Section: Verification Of the Experiments Datamentioning

confidence: 63%

“…Maruai et al [26] conducted a series of experimental measurements of flow-induced vibration using a square cylinder with a downstream flat plate. In their study, they stated that for an isolated square cylinder, only two significant flow-induced vibration behaviours can be observed, namely, VIV that occurs at lower branch velocity and galloping that occurs at higher branch velocity.…”

Section: Verification Of the Experiments Datamentioning

confidence: 99%

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Flow Induced Vibration in Square Cylinder of Various Angles of Attack

Ramzi

Lee²,

ZAINURI³

et al. 2022

IIUMEJ

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An experimental study was carried out to identify the effect of angle of attack on flow-induced vibration (FIV) of square cylinders. The experiment was conducted at the Aeronautical and Wind Engineering Laboratory (AEROLAB), UTM Kuala Lumpur using a wind tunnel that was free from external wind conditions. A supporting structure was designed and fabricated to conduct this experiment. The importance of this support structure was to enable the rigid cylinder to suspend and vibrate freely upon excitation of wind speed. The results were analysed through the response of amplitude and frequency of the rigid cylinder over a velocity range of 0.5m/s to 4.0m/s. The results showed that for a square cylinder of ?=0°, vortex-induced vibration (VIV) occurred at low reduced velocity (UR) in range of 5 ? UR ? 10 and galloping occurred at higher reduced velocity which started at UR=15. A tranquil zone was found between VIV and galloping in the reduced velocity range of 10 ? UR ? 15. As for ?=22.5° and 45°, only VIV response was found at low reduced velocity in range of 4? UR ? 9. ABSTRAK: Satu kajian eksperimentasi telah dilakukan bagi mengenal pasti pengaruh sudut serangan oleh getaran cetusan-aliran (FIV) dalam silinder persegi. Eksperimen ini dijalankan di Makmal Kejuruteraan Aeronautika dan Angin (AEROLAB), UTM Kuala Lumpur dengan menggunakan terowong angin yang bebas dari pengaruh angin luar. Struktur sokongan telah direka dan difabrikasi bagi tujuan eksperimen ini. Ini penting bagi membolehkan silinder pegun tergantung dan bergetar dengan bebas semasa ujian kelajuan angin. Dapatan kajian dianalisis melalui tindak balas amplitud dan frekuensi silinder pegun pada kadar halaju 0.5m/s sehingga 4.0m/s. Hasil kajian menunjukkan bahawa bagi silinder persegi ? = 0 °, getaran pengaruh-vorteks (VIV) berlaku pada halaju rendah (UR) dalam julat 5 ? UR ? 10 dan getaran lebih teruk telah ketara berlaku pada kadar halaju berkurang iaitu bermula pada UR = 15. Zon tenang dijumpai antara VIV dan getaran teruk pada kadar halaju berkurang 10 ? UR ? 15. Adapun pada ? = 22.5° dan 45°, hanya tindak balas VIV dijumpai pada halaju rendah dalam kadar 4? UR ? 9.

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Section: Effect Of the Angle Of Attacksupporting

confidence: 89%

Section: Verification Of the Experiments Datamentioning

confidence: 63%

Section: Verification Of the Experiments Datamentioning

confidence: 99%

See 1 more Smart Citation

Flow Induced Vibration in Square Cylinder of Various Angles of Attack

Ramzi

Lee²,

ZAINURI³

et al. 2022

IIUMEJ

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“…Numerous experimental and numerical studies can be found where the detached flat plate is applied as a control instrument by varying its position or length (Aabid et al, 2019;Ali et al, 2012;Anderson et al, 1997;Apelt et al, 1973Apelt et al, , 1975Bruneau et al, 2014;Dehkordi et al, 2011;Ding et al, 2021;Doolan, 2009;Hassanzadeh Saraei et al, 2021;S. Ul Islam et al, 2015;Shams Ul Islam et al, 2014;Liu et al, 2016;Maruai et al, 2018;Mat Ali et al, 2011;Nidhul et al, 2015;Ozono, 1999;Park et al, 2013;Rashidi et al, 2016;Roshko, 1954;Sakamoto et al, 1997;Turki, 2008;Zhou et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Effect of a Detached Bi-Partition on the Drag Reduction for Flow Past a Square Cylinder

Admi

Channouf

Lahmer

et al. 2022

Int. J. Renew. Energy Dev.

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The objective of this research is to study the fluid flow control allowing the reduction of aerodynamic drag around a square cylinder using two parallel partitions placed downstream of the cylinder using the lattice Boltzmann method with multiple relaxation times (MRT-LBM). In contrast to several existing investigations in the literature that study either the effect of position or the effect of length of a single horizontal or vertical plate, this work presents a numerical study on the effect of Reynolds number (Re), horizontal position (g), vertical position (a), and length (Lp) of the two control partitions. Therefore, this work will be considered as an assembly of several results presented in a single work. Indeed, the Reynolds numbers are selected from 20 to 300, the gap spacing (0 ≤ g ≤ 13), the vertical positions (0 ≤ a ≤ 0.8d), and the lengths of partitions (1d ≤ Lp ≤ 5d). To identify the different changes appearing in the flow and forces, we have conducted in this study a detailed analysis of velocity contours, lift and drag coefficients, and the root-mean-square value of the lift coefficient. The obtained results revealed three different flow regimes as the gap spacing was varied. Namely, the extended body regime for 0 ≤ g ≤ 3.9, the attachment flow regime for 4 ≤ g ≤ 5.5, and the completely developed flow regime for 6 ≤ g ≤ 13. A maximal percentage reduction in drag coefficient equal to 12.5%, is given at the critical gap spacing (gcr = 3.9). Also, at the length of the critical partition (Lpcr = 3d), a Cd reduction percentage of 12.95% was found in comparison with the case without control. Moreover, the position of the optimal partition was found to be equal to 0.8d i.e. one is placed on the top edge of the square cylinder and the second one is placed on the bottom edge. The maximum value of the lift coefficient is reached for a plate length Lp = 2d when the plates are placed at a distance g = 4. On the other hand, this coefficient has almost the same mean value for all spacings between the two plates. Similarly, the root means the square value of the lift coefficient (Clrms) admits zero values for low Reynolds numbers and then increases slightly until it reaches its maximum for Re = 300.

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“…Such testing is regularly performed in the aerospace (Allen et al, 2011; Füllekrug and Sinapius 1998) and civil engineering (Ghosh and Basu 2004; Razeto et al, 1994) industries. In the past three decades, there has been renewed interest in finding the response of structures to base excitations in other domains of engineering, especially energy harvesting (Hou et al, 2020; Maruai et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Calculating the response of waveguides to base excitation using the wave and finite element method

Renno

Sassi

Alnahhal

2021

Journal of Vibration and Control

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The prediction of the response of waveguides to time-harmonic base excitations has many applications in mechanical, aerospace and civil engineering. The response to base excitations can be obtained analytically for simple waveguides only. For general waveguides, the response to time-harmonic base excitations can be obtained using the finite element method. In this study, we present a wave and finite element approach to calculate the response of waveguides to time-harmonic base excitations. The wave and finite element method is used to model free wave propagation in the waveguide, and these characteristics are then used to find the amplitude of excited waves in the waveguide. Reflection matrices at the boundaries of the waveguide are then used to find the amplitude of the travelling waves in the waveguide and subsequently the response of the waveguide. This includes the displacement and stress frequency response transfer functions. Numerical examples are presented to demonstrate the approach and to discuss the numerical efficiency of the proposed method.

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Downstream flat plate as the flow-induced vibration enhancer for energy harvesting

Cited by 14 publications

References 38 publications

Flow Induced Vibration in Square Cylinder of Various Angles of Attack

Flow Induced Vibration in Square Cylinder of Various Angles of Attack

Effect of a Detached Bi-Partition on the Drag Reduction for Flow Past a Square Cylinder

Calculating the response of waveguides to base excitation using the wave and finite element method

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