Flow around square-like cylinders with corner and side modifications

Du, Xiaoqing; Shi, Dingjun; Dong, Haotian; Liu, Yantai

doi:10.1016/j.jweia.2021.104686

Cited by 19 publications

(6 citation statements)

References 52 publications

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“…To further verify the accuracy of the Case 3 grid, the average wind pressure coefficient was compared (Figure 5) and the fluctuating wind pressure coefficient (Figure 6) curves between the simulation results of Case 3 were analyzed. The results of literature [5,6,11,12], showed that the simulation results are consistent with the curves of the literature results. The maximum deviation of the average wind pressure coefficient of the numerical simulation from the literature value is not more than 5%.…”

Section: Mesh Convergence Analysis and Results Verificationsupporting

confidence: 86%

“…The physical properties of the fluid are regarded as viscous and incompressible according to the results of structural wind load studies. Assuming that the filtering process and the derivation process are interchangeable, an equation of motion (N-S equation) describing the momentum conservation of a viscous incompressible fluid is filtered [12]. The governing equations for the large eddy simulation are obtained as follows.…”

Section: Large Eddy Simulationmentioning

confidence: 99%

“…The wind tunnel test showed the aerodynamic interference effect and the flow field distribution of parallel and tandem square cylinders with different spacing ratios. Early research involving wind load was mainly based on a single building [3][4][5][6][7][8][9][10][11][12], and was gradually extended to the research on the interference effect between multiple buildings. Due to the low testing costs, simple technology and flexible design, the wind tunnel test effectively promotes research on the interference effect between buildings.…”

Section: Introductionmentioning

confidence: 99%

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Wind-Induced Interference Effect of Chamfered Square Cylinders in Tandem and Side-by-Side Arrangements

Zhang

et al. 2022

Buildings

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A large-eddy simulation analysis technique is introduced in this paper to determine the interference effect of chamfered square cylinders, which is crucial to predict the impact of wind pressure and load on chamfered high-rise buildings. Based on the grid convergence analysis of the model and the validation of its accuracy, the aerodynamic interference effect, including the flow field distribution of parallel and tandem square cylinders with different spacing ratios has been compared and analyzed. The influence regulation and formation mechanism of the wind pressure interference effect have been explored. For side-by-side chamfered corners square cylinders, the average drag coefficient mainly shows an amplification effect, and the fluctuating lift coefficient mainly shows a reduction effect. When B/L = 1.5, the interference factor of the disturbed square cylinder reaches a maximum, which is located at the back flow field on the adjacent side. There is a clear critical spacing ratio for tandem double-cut square cylinders. When the spacing ratio exceeds the critical value, significant changes are observed in the aerodynamic performance. These include wind pressure distribution, non-Gaussian characteristics, and the interference effects of structures.

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Section: Mesh Convergence Analysis and Results Verificationsupporting

confidence: 86%

Section: Large Eddy Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wind-Induced Interference Effect of Chamfered Square Cylinders in Tandem and Side-by-Side Arrangements

Zhang

et al. 2022

Buildings

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“…In order to reduce the occasional comparison results, the average wind pressure coefficients and fluctuating wind pressure coefficients at the center line of the model height direction in Case3 were selected and compared with the wind tunnel test results and numerical simulation results in literature review, as shown in Figure 4 and Figure 5. The tendency and value of average wind pressure coefficients and fluctuating wind pressure coefficients in numerical simulation is consistent with what is obtained in [1,[26][27][28][29]. However, the fluctuating wind pressure coefficients of the side elevation of the square cylinder (coordinate corresponding to 0.5~1.5) is larger than the wind tunnel test value of Lee [1], but the results are similar to those of Berman and Obasaju [26].…”

Section: Simulation Verificationsupporting

confidence: 87%

Large eddy simulation on wind-induced interference effects of staggered chamfered square cylinders

Cao,

Wang,

Liu

et al. 2023

Preprint

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Chamfered corners in buildings are the main means to reduce the control effect of wind load on the structure, and the interference effect of chamfered buildings cannot be ignored. At present, only the mutual interference coefficients of square and rectangular section buildings are given in the Chinese code, without the interference effect of chamfered buildings being specified. Therefore, in this paper, aerodynamic force and wind pressure coefficients of chamfered square cylinders of different spacing are obtained by the large eddy simulation method. Wind load characteristics, non-Gaussian characteristics and interference effects of chamfered square cylinders with different arrangements are studied based on aerodynamic coefficients, wind pressure coefficients and interference coefficients. The results show that when the wall y plus value is 1, the large eddy simulation is the most accurate to simulate the wind load and wind field parameters. Besides, the aerodynamic effects, non-Gaussian characteristics and interference effects between the chamfered square cylinders are mainly controlled by the cross-wind interval and the spacing (4.0, 4.0) is the characteristic coordinate. That means, when the spacing is smaller than this co-ordinate, the interference effect of the square cylinder is more obvious. When the spacing coordinate is greater than (4.0, 4.0), the aerodynamic coefficients and non-Gaussian regional distributions of the principal square cylinder and the isolated cylinder are the same, and the interference factor approaches 1.

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“…Li et al [6] further reported reduction in wind load over buildings having square cross section as a result of corner modification i.e., (chamfered and recessed). Du et al [7] numerically analysed six shape modifications of square cylinder and concluded that aerodynamic forces are reduced in case of round corners and convex sides whereas round cornered concave sides enhance the aerodynamic forces/wind loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of Corner Modification on Forced Convection and Properties of Flowing Fluid Past Static Equilateral Triangular Prism at Various Reynolds Numbers

Ashfaq,

Manzoor

2023

MATEC Web Conf.

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This paper demonstrates the 2D numerical investigation to determine outcome of corner modification on the heat transfer and flow parameters of fluid flowing past static equilateral triangular prism. For this purpose, the corners are modified in such a way that 1/8 of the side length of prism is chamfered and rounded. Prism is placed in incompressible flow in such a way that one of its vertices is facing the upstream. Flow velocity varies as Reynolds number range from 50 to 150 with an increment of 20. Drag and lift coefficients are sensitive to corner profile of prism. At Re of 110, rounding caused a maximum of 6.5% and 12.6% reduction is observed after chamfering the corners of prism. Increasing Re caused Root mean square value of lift coefficient (CLRMS) to increase. At Re of 150, chamfered corners increased the CLRMS by 22.3% whereas rounding enhanced it by 21.6%. Time-averaged streamlines suggested the reduction in the wake width behind the prism with increasing Re and changed corner profile. Forced convective heat transfer from sharp, rounded and chamfered prisms is discussed in terms of time and space averaged Nusselt number which enhanced by 5% after corner modification of prism. Lastly, mean spread of heat transfer coefficient over prisms is presented and discussed.

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Flow around square-like cylinders with corner and side modifications

Cited by 19 publications

References 52 publications

Wind-Induced Interference Effect of Chamfered Square Cylinders in Tandem and Side-by-Side Arrangements

Wind-Induced Interference Effect of Chamfered Square Cylinders in Tandem and Side-by-Side Arrangements

Large eddy simulation on wind-induced interference effects of staggered chamfered square cylinders

Effect of Corner Modification on Forced Convection and Properties of Flowing Fluid Past Static Equilateral Triangular Prism at Various Reynolds Numbers

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