Study on Outdoor Wind Flow and Mean Wind Pressure around the ‘T’ Plan Shape Tall Building

The wind flow around the elliptical object was investigated experimentally in the BLWT wind tunnel in Bratislava and subsequently solved by computer wind flow simulation. On a high-rise building model, the external wind pressure coefficients were evaluated for different wind directions and then compared with the numerical CFD simulation in ANSYS, where different models of turbulence and mesh types were used. The aim of the article was to evaluate and compare the obtained values and after analysing the results to choose the most suitable model of turbulence and mesh types, which showed the smallest deviations from the experimental values.

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Wind Force on Tall Structure: An Approach From SPH

IAMURE International Journal of Education ◽

10.7718/iamure.ije.v2i1.179 ◽

2012 ◽

Vol 2 (1) ◽

Author(s):

Ananna Ahmed ◽

Abdullah Hil Baki ◽

Munaz Ahmed Noor

Keyword(s):

Structural Engineering ◽

Model Simulation ◽

Wind Load ◽

Tall Building ◽

Test Method ◽

Wind Pressure ◽

Wind Force ◽

Wide Range ◽

Particle Hydrodynamics ◽

Tall Structure

Wind pressure calculation for tall building frame has always been an extensive job. Usual methods used to estimate wind load are Wind tunnel test method and Finite Element Method and specifications has been derived. In this research, with a view to eliminating drawbacks of these methods and providing a visual interpretation of wind flow a third method is introduced using Smooth Particle Hydrodynamics (SPH) Approach. A model simulation was performed by a SPH software named SPHysics to calculate the pressure exerted on the structure and to derive a graphical interpretation of flow pattern using Para View. Values of pressure at different elevation of the building that actually occurs when wind with certain velocity flows through a tall building are found. From the data found, height vs. pressure graphs are generated which clearly supports the proportional relationship between these two parameters even with triangular and parabolic variation. Again, velocity vs. pressure graphs are plotted which also justifies inter-relationship of proportionality. This is a qualitative comparison not a quantitative one as there is many limitations regarding technicality, computer capacity, and time. These values may be crosschecked with the values found from conventional methods when more precise and suitable boundary conditions can be used in simulation. In future, with intricate detailing and suitable three dimensional modeling, more accurate value of pressure can be found with wide range of applicability. The authors are expecting derivation of two equations as a function of height and velocity to calculate wind load to use in design if further proceeding is possible. This can offer a significant benefit of simplicity for users and can be beginning a new era of using SPH in structural engineering. Keywords - Wind force, tall structure, Particle Hydrodynamics Approach

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Experimental Investigation of the Wind Pressure Distribution and Wind Interference Effects on a Typical Tall Building

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.639-640.444 ◽

2013 ◽

Vol 639-640 ◽

pp. 444-451 ◽

Cited By ~ 1

Author(s):

Yi Li ◽

Q.S. Li ◽

K.L Ju

Keyword(s):

Pressure Distribution ◽

Wind Tunnel Test ◽

Side Wall ◽

Tall Buildings ◽

Tall Building ◽

Wind Pressure ◽

Shielding Effect ◽

Interference Effects ◽

Large Cities ◽

Pressure Coefficients

Most tall buildings are constructed in the prosperous center of large cities, where is inevitable to be surrounded by many interfering buildings. Wind interference effects among buildings should not be neglected. Therefore, it is necessary to investigate wind interference effects on such tall buildings. Based on the wind tunnel test of rigid model of a tall building, the wind pressure distribution on the building with interfering buildings around it has been researched, the contours of the mean and fluctuate wind pressure coefficients have also been presented. It has been found that shielding effect and channeling effect are significant in the wind interference effects on building. Wind pressure coefficients on side wall and leeward wall of a upstream building may be dramatically changed in case the wake boundary of the upstream building is interfered. The conclusions might be used as reference to structural design and plan.

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Wind Load Characteristics of Tall Building with Atrium

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.639-640.515 ◽

2013 ◽

Vol 639-640 ◽

pp. 515-522

Author(s):

Yong Gui Li ◽

Q.S. Li

Keyword(s):

Wind Tunnel ◽

Critical Role ◽

Pressure Coefficient ◽

Tall Building ◽

Wind Pressure ◽

Wind Loads ◽

Design Guideline ◽

Pressure Coefficients ◽

Opening Ratio ◽

Wind Pressures

Wind tunnel test of 1:500 rigid model of tall building with atrium was carried out. Based on the experimental results, characteristics of wind pressures on atrium facades and wind loads on the structure were investigated in detail. The results show that the formation of flow separation on the building top plays a critical role in the generation of wind pressures on the atrium facades. Meanwhile, wind pressure coefficient distributions on the atrium facades are found to be relatively uniform. Moreover, the horizontal and vertical correlations of pressure coefficient exhibit high at most locations on atrium facades. With the increasing of the opening ratio, the mean wind pressure coefficients first decreased and then stabilized, and the fluctuating wind pressure coefficients first decreased and then increased. A design guideline for the wind-resistant design of atrium facades was proposed, and the results predicted by the proposed guideline were in good agreement with those from the wind tunnel tests, indicating that the proposed guideline can be used in engineering applications. When the opening ratio is no more than 5.33%, the effect of the facade pressures within the atrium on the wind loads on the structure can be ignored. For such cases, the wind-resistant design for a tall building with atrium can refer to that of a similar shape tall building without atrium.

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Study of Pressure Distribution on an Irregular Octagonal Plan Oval-Shape Building Using CFD

Civil Engineering Journal ◽

10.28991/cej-2021-03091760 ◽

2021 ◽

Vol 7 (10) ◽

pp. 1787-1805

Author(s):

Arun Kumar ◽

Ritu Raj

Keyword(s):

Pressure Distribution ◽

Natural Ventilation ◽

Open Space ◽

Flow Characteristics ◽

Wind Pressure ◽

Wind Flow ◽

Steady State Flow ◽

Building Model ◽

Ansys Cfx ◽

Oval Shape

This paper aims to study the wind flow characteristics and to analyze the wind pressure distribution on the surfaces around an irregular octagonal plan shape building model. There is a central open space in plan to provide more surface area around the building for natural ventilation. Plan area of the building is 300 m2(excluding the open space) and height is 50 m. Steady state flow of wind with 5% turbulence (moderate turbulence) under atmospheric boundary layer has been taken in the study. Numerical simulation with standard k-e model using ANSYS (CFX) software has been used for the purpose. Flow characteristics has been studied in terms of flow separation, reattachment of flow, creation of wakes and vortices. The surface pressure generated around the model has been studied in terms of coefficient of pressure. The model is symmetrical about both the axes in plan. Hence, study for different wind angle of attacks from 0° to 90° @ 30° interval has been conducted. The flow characteristics and unusual or critical coefficient of pressure on surfaces of the model observed have been discussed. Doi: 10.28991/cej-2021-03091760 Full Text: PDF

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