The effect of shroud on vortex shedding mechanism of cylinder

Durhasan, Tahir; Pinar, Engin; Ozkan, Gokturk M.; Akıllı, Hüseyin; Şahi̇n, Beşi̇r

doi:10.1016/j.apor.2019.01.007

Cited by 21 publications

(5 citation statements)

References 30 publications

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“…Flow characteristics and force coefficients on the cylinder depend on many parameters such as Reynolds number, blockage ratio, turbulence intensity of free-stream flow and surface roughness at the cylinder. Therefore, the drag coefficient obtained in this study are consistent with the experimental studies of Najafi et al [4] and Durhasan et al [19] performed at similar Reynolds number and turbulence intensities. In this study, the flow characteristics was obtained with PIV method in water channel, and the drag forces was measured in the wind tunnel.…”

Section: çü Müh Fak Dergisi 36(4) Aralık 2021supporting

confidence: 92%

The Turbulence Intensity Effect on the Flow Characteristics and Aerodynamics of a Circular Cylinder

Karasu

Tümse

2021

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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In this investigation, a numerical study about the turbulence intensity effect on the time-dependent flow structure around a circular cylinder employing k-ω based Detached Eddy Simulation (DES) turbulence model was performed at sub-critical Reynolds number of Re=5×10 3 . According to the numerical analyses, the length of recirculation region reduces as the level of turbulence intensity augments. While the normalized length of recirculation region after the cylinder, L s /D is measured as 1.225 at turbulence intensity of Tu=0.8%, it reduces to the value of L s /D =1.0822 at turbulence intensity of Tu=7%. Furthermore, the location of peak negative pressure coefficient moves in downstream direction by increasing turbulence intensity. The drag coefficient, C D was observed to increase when turbulence intensity increases from Tu=0.8% to 7% and 12%. Thus, it was concluded that the level of turbulence intensity is effective on changing the flow characteristics and aerodynamics of a circular cylinder.

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Section: çü Müh Fak Dergisi 36(4) Aralık 2021supporting

confidence: 92%

The Turbulence Intensity Effect on the Flow Characteristics and Aerodynamics of a Circular Cylinder

Karasu

Tümse

2021

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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“…It was observed that the vortex shedding in the wake region has been disrupted and formation length has been increased. Durhasan and Pinar [29] studied the gap between a circular cylinder and a shroud to investigate the effect of shroud porosity and diameter. Therefore, the experiment was conducted for various porosity and diameter ratios at a Reynolds number of Re = 5000.…”

Section: Permeable and Porous Meshmentioning

confidence: 99%

“…Therefore, the experiment was conducted for various porosity and diameter ratios at a Reynolds number of Re = 5000. Durhasan and Pinar [29] divided the field of view into four flow regions as demonstrated in Figure 2. These regions are upstream region I (UR I), upstream region II (UR II), downstream region I (DR I) and downstream region II (DR II).…”

Section: Permeable and Porous Meshmentioning

confidence: 99%

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Teimourian¹,

Teimourian²

2021

Eng

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Vortex shedding phenomenon behind bluff bodies and its destructive unsteady wake can be controlled by employing active and passive flow control methods. In this quest, researchers employed experimental fluid dynamics (EFD), computational fluid dynamics (CFD) and an analytical approach to investigate such phenomena to reach a desired outcome. This study reviews the available literature on the flow control of vortex shedding behind bluff bodies and its destructive wake through the modification of the geometry of the bluff body. Various modifications on the bluff body geometries namely perforated bluff bodies, permeable and porous mesh, corner modification and wavy cylinder have been reviewed. The effectiveness of these methods has been discussed in terms of drag variation, wake structure modifications and Strouhal number alteration.

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“…Elde ettikleri bulgular silindir art izindeki girdap oluşum uzunluğunun arttığını, taşıma kuvveti sapınçlarının ve sürükleme katsayının azaldığını göstermiştir. Durhasan ve arkadaşları [17] silindir etrafının delikli silindir ile çevrelenmesinin silindir art izindeki daimi olmayan girdapların bastırılmasında etkili olduğunu ortaya koymuşlarıdır. Lee ve arkadaşları [18] gelen akış bölgesine konumlandırılan kontrol çubuğunun silindir art izindeki akış yapısı ve sürükleme katsayısı üzerine etkisini deneysel olarak çalışmışlardır.…”

Section: Introductionunclassified

Vortex Suppression Downstream of a Cylinder via Guide Wanes

EKİNCİ,

DURHASAN,

AKILLI

2023

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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Dairesel kesitli silindirin art izindeki daimi olmayan girdapların kılavuz plakalar kullanılarak bastırılması deneysel olarak araştırılmıştır. Kılavuz plakalar yay şeklinde imal edilmiş ve üç farklı açıklık oranı (G/D=0,1, 0,3 ve 0,5) ve plaka açı değerleri 60°≤α≤90° aralığında incelenmiştir. Silindir art izindeki akış yapıları PIV ölçümü ile Reynolds sayısının 7500 değerinde elde edilmiştir. Akış ölçümünden elde edilen Reynolds kayma gerilmeleri, girdap konturları, hız bileşenleri ve girdap kopması frekans sonuçları ile yalın silindir durumu ile kıyaslanarak açıklanmıştır. Düşük plaka açı değerlerinde girdap kopma frekansları üzerinde daha etkin olduğu yüksek plaka açı değerlerinin ise girdap sönümlemede daha etkin olduğu gözlemlenmiştir. Reynolds kayma gerilmelerinin bastırılmasında açılık oranı G/D=0,1’in diğer açıklık oranları ile kıyaslandığında daha etkili olduğu gözlemlenmiştir.

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The effect of shroud on vortex shedding mechanism of cylinder

Cited by 21 publications

References 30 publications

The Turbulence Intensity Effect on the Flow Characteristics and Aerodynamics of a Circular Cylinder

The Turbulence Intensity Effect on the Flow Characteristics and Aerodynamics of a Circular Cylinder

Vortex Shedding Suppression: A Review on Modified Bluff Bodies

Vortex Suppression Downstream of a Cylinder via Guide Wanes

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