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Flows in Complex Systems

Numerical Prediction of Wind Flow Around Irregular Models

[+] Author and Article Information
D. Y. Wang

Y. Zhou1

Y. Zhu

School of Civil Engineering,  GuangZhou University, Guangdong Guangzhou, 510006, P. R. C.

Tim K. T. Tse

Department of Civil and Environmental Engineering,  The Hong Kong University of Science and Technology, Hong Kong

1

Corresponding author.

J. Fluids Eng 134(7), 071108 (Jul 20, 2012) (11 pages) doi:10.1115/1.4006225 History: Received August 21, 2011; Revised February 22, 2012; Published July 20, 2012; Online July 20, 2012

This paper presents numerical predictions of flow around irregular-plan buildings (S-, R-, L- and U-shaped models) in high Reynolds number. The adopted computational approach and numerical models are described firstly. Then comparative analysis with the numerical and experimental data has been conducted to verify the reliability of the numerical predictions. Finally, characteristics of mean and fluctuating pressure distributions and vertical and lateral velocity profiles of the flow around the four models have been investigated and assessed thoroughly. The study shows that satisfactory results can be obtained by large eddy simulation (LES), especially when fluctuating wind velocity is considered in the inflow boundary. Distribution of mean pressure coefficients on front faces is relatively regular. Large fluctuating pressure coefficients are induced by strong vortex motion. Velocity profiles of wind flow are disturbed obviously among the four building models, especially in weak flow. The disturbed intensity decreases with increasing of the distance away from bluff body. The suggested MDS (Maximum Disturbance Scopes) away from bluff body are generally 0.25H in inflow zones, 0.4H in roof zones, 0.5H in both side zones and 3H in weak zones.

Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Computational domains and boundary conditions

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Figure 2

Computational models

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Figure 3

Grid generation style

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Figure 4

Profiles of mean velocity and turbulence intensity in the model inflow

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Figure 5

Comparison of the spectra generated by the DSRFG and the target spectrum

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Figure 6

Comparison of surface pressure coefficients

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Figure 7

Pressure coefficient contours of the front faces

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Figure 8

Pressure coefficients on front faces

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Figure 9

Mean pressure coefficient contours on rear faces

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Figure 10

Fluctuating pressure coefficients

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Figure 11

Vertical velocity profiles of the S-, R- and U-shaped models

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Figure 12

Model zones and MDS

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Figure 13

Wind velocity field of case B (Plan D)

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Figure 14

Lateral velocity profiles of case B and case F

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Figure 15

Lateral velocity profiles of plane C1, C2 and C3 for case C and case E

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Figure 16

Wind velocity field at z = 0.5H

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