Simulation of the Influence of Aspect Ratio on the Aerodynamics of Rectangular Prisms

Yu, Dahai; Butler, Kyle; Kareem, Ahsan; Glimm, James; Sun, Jiangang

doi:10.1061/(asce)em.1943-7889.0000494

Cited by 37 publications

(18 citation statements)

References 33 publications

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“…The results from Yu et al. (2013) are slightly higher because Re in that study was around 10 5 , and Nakamura et al. (1991) showed that higher Re usually lead to higher shedding frequencies.…”

Section: Effect Of B/d On Flow Characteristicsmentioning

confidence: 62%

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Global instability and mode selection in flow fields around rectangular prisms

et al. 2023

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Large-eddy simulations of the unsteady flows around rectangular prisms with chord-to-depth ratios (B/D) ranging from 3 to 12 are carried out at a Reynolds number of 1000. A particular focus of the study is the physical mechanisms governing the global instability of the flow. The coherent structures and velocity spectra reveal that large-scale leading-edge vortices (L vortices) are formed by the coalescence of Kelvin–Helmholtz rollers. Based on dynamic mode decomposition, the interactions between the L vortex and the trailing-edge vortex (T vortex) at different B/D values are revealed. It is found that the phase difference between the L and T vortices is the critical factor promoting a stepwise increase in the Strouhal number with increasing B/D. According to the phase analysis, there are two types of pressure feedback-loop mechanisms maintaining the self-sustained oscillations. When B/D = 4–5, the feedback loop covers the separation region, and the global instability is controlled by the impinging shear-layer instability. When B/D = 3 and 6–12, the feedback loop covers the entire chord, and the global instability is controlled by the impinging leading-edge vortex shedding instability. Self-sustained oscillations of the shear layer still exist after a splitter plate is placed in the near wake, indicating that the T vortex shedding is not essential in triggering the global instability. Nevertheless, with the participation of the T vortex, the primary instability mode may be reselected due to the upper and lower limits of the shedding frequency imposed by the T vortex.

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Section: Effect Of B/d On Flow Characteristicsmentioning

confidence: 62%

“…(1991) and the numerical results from Yu et al. (2013). The predominant frequency component (referred to as the main St mode below) at a specific B / D is marked by a filled circle, while the other frequencies are marked by open circles.…”

Section: Effect Of B/d On Flow Characteristicsmentioning

confidence: 89%

Global instability and mode selection in flow fields around rectangular prisms

et al. 2023

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“…Beberapa komponen dasar dari karakteristik aerodinamis pada penganggu aliran (bluff body) adalah komponen drag and lift, dan bilangan Strouhal, yang banyak ditemukan pada referensi [2]- [8].…”

Section: Pendahuluanunclassified

Analisa numerik karakteristik aliran di sekitar struktur bentuk menyilang menggunakan model uRANS

Hakim

2021

DJITM

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Karakteristik aerostatik penampang struktur berbentuk menyilang diteliti secara numerik menggunakan model unsteady Reynold Average Navier-Stokes (uRANS) dua dimensi dengan model turbulensi SST k-w. Sudut aliran masuk yang berbeda digunakan untuk menyelidiki fitur aliran di sekitar struktur tersebut. Hasil penelitian menunjukkan bahwa tekanan dasar maksimum dicapai pada sudut serang (a) = 30 derajat di mana vortisitas negatif menggulung di belakang struktur relatif jauh dari benda. Gaya aerodinamika model dengan a= 30 derajat adalah kesepakatan yang masuk akal untuk hasil eksperimen. Frekuensi strouhal menunjukkan prediksi yang kurang tepat untuk model dengan a≥20 derajat aliran masuk dibandingkan dengan hasil eksperimen. Tekanan dasar yang paling negatif ditunjukkan pada sudut serang a =15°. Gaya aerodinamis hasil simulasi berbeda dari model tiga dimensi dari penelitian eksperimental. Hal ini menunjukkan bahwa struktur dua dimensi dari model uRANS dalam penelitian ini memberikan nilai yang besar untuk fitur aliran tiga dimensi dari hasil eksperimen. Vortex street dibelakang struktur menunjukkan model single-pair (S+P) untuk semua kasus perlakuan.

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“…Unsteady computations are conducted by Blocken et al, [4] on cubic model. The work of Yu et al, [5] studied the influence of aspect ratio on the flow around a prism using LES. In a study by Kwon and Kareem [6], they introduced the "Gust Front Factor" to account for transient aerodynamic effects in building codes.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Architectural Features to Mitigate Peak Pressures over Low-Rise Buildings

El-Okda

Emeara

2021

ARFMTS

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A number of aerodynamic devices to perturb or modify the flow over low-rise buildings are proposed. The purpose of these devices is to reduce the adverse effects of wind over low-rise buildings and to mitigate the pressures on the roofs to lower vacuum levels. Pressure measurements were performed on a scaled down model of the well-known TTU experimental building of the Wind Engineering Research Facility (WERFL) at TTU University. Different results were obtained: reduction of average peek vacuum, smoothing of windward pressure distribution on the roof and narrowing and localizing of the suction pressure zones on the roof. Results that may be of interest to other disciplines such as heat transfer are also reported.

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Simulation of the Influence of Aspect Ratio on the Aerodynamics of Rectangular Prisms

Cited by 37 publications

References 33 publications

Global instability and mode selection in flow fields around rectangular prisms

Global instability and mode selection in flow fields around rectangular prisms

Analisa numerik karakteristik aliran di sekitar struktur bentuk menyilang menggunakan model uRANS

Aerodynamic Architectural Features to Mitigate Peak Pressures over Low-Rise Buildings

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