Large eddy simulation of flow around an inclined finite square cylinder

Hu, Gang; Tse, K.T.; Kwok, K.C.S.; Zhang, Yu

doi:10.1016/j.jweia.2015.08.008

Cited by 67 publications

(14 citation statements)

References 40 publications

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“…As to LES, its principal idea is to decrease the computational cost by modelling the small length scales which are the most computationally expensive to resolve. Based on this, the LES predictions show high accuracy, and good examples can be found in literature of ground vehicle prediction (Hemida and Krajnović, 2010;Krajnović, 2009) and bluff bodies (Krajnović, 2009;Hu et al, 2015). However, the Reynolds numbers in these simulations are much lower than the realistic ones.…”

Section: Introductionmentioning

confidence: 63%

Comparison of PANS and LES of the flow past a generic ship

et al. 2018

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The prediction of flow past a generic ship has been performed using partially-averaged Navier-Stokes (PANS) turbulence model. The Reynolds number based on the width of the ship is × 8 10 4. A detailed comparison with resolved large-eddy simulation (LES) solution and available experimental data is made for a better understanding of the capability of PANS in predicting the turbulent flow in the wake. The results show that PANS produces similar trends to those predicted by LES. However, a coarse grid resolution will lead PANS to act as unsteady Reynolds-averaged Navier-Stokes (URANS). Although the geometry is symmetric for the incoming flow at a zero yaw angle, bi-stable behaviour is observed in the wake, contributing to an asymmetric flow distribution on the heli-deck.

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Section: Introductionmentioning

confidence: 63%

Comparison of PANS and LES of the flow past a generic ship

et al. 2018

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“… is the Karman constant, d is the distance to the closest wall, C S is the Smagorinsky coefficient and  is the filter width. On the basis of experience-based evaluation, the use of Cs=0.1 provided the most accurate results [6,11]and thus is also used in the present study.…”

Section: Advances In Engineering Research (Aer) Volume 72mentioning

confidence: 99%

The Wind Characteristics of Tall Cylinder Buildings with Vertical-Grooves

Yuan¹,

Chen²,

Zhao³

2017

Proceedings of the 2016 International Conference on Architectural Engineering and Civil Engineering

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Abstract-The Reynolds number of flow field around circular cylinders is usually high under strong wind for most full-scale tall buildings, which is difficult to achieve in most wind tunnel tests. To explore the wind characteristics of tall cylindrical buildings with vertical-equidirectional grooves from subcritical to transcritical flow, wind tunnel tests and full-scale large eddy simulations were carried out. The results showed that the rectangular-grooves narrow the wake width due to the downstream movement of the separation point and the deeper grooves cause smaller mean pressure. Furthermore, larger groove roughness leads to lower frequency of vortex shedding and the Strouhal number remains at the range from 0.15 to 0.35.The drag coefficient of rough cylinders is 2~3 times as large as that of smooth cylinders under the trend of decrease.

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“…Nevertheless, the limits of this theory for practical applications have been highlighted in many works [14][15][16][17]. Interestingly, the galloping instability of a forward and a backward inclined square prism has recently been experimentally and numerically investigated in [17][18][19], which emphasize the differences as compared to the case of the same cylinder perpendicular to the incoming flow and provide a physical explanation for the results.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Aeroelastic stability of two long-span arch structures: A collaborative experience in two wind tunnel facilities

Mannini

Belloli

Marra

et al. 2016

Engineering Structures

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a b s t r a c tIn this paper, a rare example of comparison between sectional and full-aeroelastic model tests is presented. Interestingly, the experiments were conducted in two very different wind tunnel facilities by different research teams. The study concerns two long-span steel arch structures recently built in Milan, Italy, for Expo 2015 World Fair. The structures have only aesthetic purposes and are therefore very flexible and light, which makes them sensitive to wind-induced excitation and prone to aeroelastic instabilities. In particular, in smooth flow an interesting phenomenon of interference between vortex-induced vibration and galloping was observed up to high values of the Scruton number. This aeroelastic instability is very dangerous as large-amplitude vibrations can occur in wind speed ranges where they are not expected, at least for what classical theories for vortex-induced vibration and quasi-steady galloping are concerned. Moreover, the provisions of Eurocode 1 resulted clearly unsuitable and nonconservative to address such a phenomenon. Despite the differences in the facilities and in the models, a good agreement was found between the results obtained in the two laboratories. The major discrepancies were observed in the transitional behavior for intermediate values of the Scruton number, the sectional model showing a more unstable behavior. The tests on the full-aeroelastic model also allowed considering the effect of the angle of wind exposure of the structures, both the in-plane and the out-ofplane vibrations of the arches and the dynamic response to turbulent wind. In particular, a set of tests in smooth flow was performed accounting for the presence of the other arch and of the surrounding buildings. A particular dynamic excitation of the in-plane flexural modes of the structures was observed in well defined ranges of flow speeds when one arch is in the wake of the other. Finally, both experimental campaigns highlighted the need for the installation of tuned mass dampers on the real structures to guarantee their safety. The effectiveness of these devices against the observed galloping-type instability was also verified through wind tunnel tests on the full-aeroelastic model.

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Large eddy simulation of flow around an inclined finite square cylinder

Cited by 67 publications

References 40 publications

Comparison of PANS and LES of the flow past a generic ship

Comparison of PANS and LES of the flow past a generic ship

The Wind Characteristics of Tall Cylinder Buildings with Vertical-Grooves

Aeroelastic stability of two long-span arch structures: A collaborative experience in two wind tunnel facilities

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