scholarly journals Wind structure influence on surface pressures of rectangular cylinders of cross-section dimensions 10 cm x 20 cm

2012 ◽  
Vol 10 (1) ◽  
pp. 069-080
Author(s):  
Tomasz Lipecki ◽  
Ewa Błazik-Borowa ◽  
Jarosław Bęc
Keyword(s):  
Cross Section ◽  
Pressure Coefficient ◽  
Wind Pressure ◽  
Wind Speed Profile ◽  
Wind Structure ◽  
Power Spectral ◽  
Mean Wind Speed ◽  
Spectral Density Functions ◽  
Wind Pressure Coefficient ◽  
Rectangular Cylinders

The paper deals with results of measurements which have been carried out in the wind tunnel. Vertical, fixed prism of the cross-section dimensions 10 cm x 20 cm was the object of the experiment. Distributions of mean wind pressure coefficient on the surface of the prism were accepted as results presentation. The following parameters of the wind structure were analysed: vertical mean wind speed profile, turbulence intensity profile, power spectral density functions with respect to their influence on pressure coefficient values. Changes of the angle of wind attack were taken into consideration.

scholarly journals Wind structure influence on pressure coefficient distribution on the surface of circular cylinder of the diameter 20 cm

2012 ◽  
Vol 10 (1) ◽  
pp. 081-092
Author(s):  
Tomasz Lipecki ◽  
Jarosław Bęc ◽  
Ewa Błazik-Borowa
Keyword(s):  
Circular Cylinder ◽  
Vertical Profile ◽  
Pressure Coefficient ◽  
Coefficient Distribution ◽  
Wind Structure ◽  
Power Spectral ◽  
Mean Pressure ◽  
Mean Wind Speed ◽  
Spectral Density Functions ◽  
D 20

The paper deals with results and analyses of the model investigations which were performed in wind tunnel and were focused on the flow around single circular cylinder. Presented results are related to variations in the distribution of the normalized mean pressure coefficient on the surface of the model as well as its standard deviation. Sic cases of the approaching flow were taken into consideration. The flow was described by vertical profile of the mean wind speed, vertical profile of the intensity of turbulence, and power spectral density functions. The height and dimension of the model were respectively equal: H = 100 cm, D = 20 cm. Selected results of measurements have been shown in the paper as the effect of these experiments.

scholarly journals Effects of Interference on Local Peak Pressures Between Two Buildings with an Elliptical Cross-Section

2021 ◽  
Vol 29 (1) ◽  
pp. 35-41
Author(s):  
Michal Franek ◽  
Marek Macák
Keyword(s):  
Cross Section ◽  
Pressure Coefficient ◽  
Elliptical Cross Section ◽  
Wind Pressure ◽  
Strong Impact ◽  
Interference Effects ◽  
Elliptical Cross ◽  
Wind Pressure Coefficient ◽  
Peak Pressures ◽  
Peak Value

Abstract The interference effects on the distribution of external wind pressure coefficient between two high-rise buildings with an elliptical cross section were studied experimentally at the Boundary Layer Wind Tunnel (BLWT) at the Faculty of Civil Engineering STU in Bratislava, Slovakia. Various arrangements of models, which were derived from the breadth ratio, were investigated. The peak value of the external wind pressure coefficient for a stand-alone model was measured and compared with the peak value in the case of interference. The measurements showed that the wind loads on buildings in a close vicinity are considerably different from those on a stand-alone building. The interference effects significantly affect negative pressure zones. The optimal and critical arrangements of buildings were evaluated. The elimination of peak negative external wind pressure coefficients can be reduced by half. On the other hand, the interference effects had a strong impact on increasing the peak value of the negative external wind pressure coefficient, which can be more than roughly double compared to an isolated building.

scholarly journals The influence of the wind structure definition in the standard k-ε model of turbulence on the distribution of pressure coefficient on the façades of the prism

2012 ◽  
Vol 10 (1) ◽  
pp. 093-104
Author(s):  
Paulina Jamińska
Keyword(s):  
Kinetic Energy ◽  
Pressure Coefficient ◽  
Experimental Studies ◽  
Turbulence Kinetic Energy ◽  
Wind Pressure ◽  
Ansys Fluent ◽  
Coefficient Distribution ◽  
Wind Structure ◽  
Wind Pressure Coefficient ◽  
Definition Of

The paper deals with the influence of the definition of turbulence kinetic energy k and dissipation of turbulence kinetic energy ε on wind pressure coefficient distribution on walls of rectangular model. The investigation includes computer simulations for the four cases of boundary conditions, the most common in the literature. In some analysed cases, the wind structure characteristics used in computations were derived from experimental studies performed in the wind tunnel. The results in the form of pressure coefficients were analyzed on the basis of their relevance to the use in the field of wind engineering. All calculations were performed in ANSYS FLUENT with use of standard k-ε model. The 3D model of the flow around the prism was considered in calculations.

CFD Modeling of Pressure Coefficients for a Natural Ventilation Study in an Experimental Low Rise Building

2013 ◽  
Author(s):  
Robel Kiflemariam ◽  
Cheng-Xian Lin
Keyword(s):  
Natural Ventilation ◽  
Pressure Coefficient ◽  
Wind Pressure ◽  
Analytical Models ◽  
Cfd Modeling ◽  
Engineering Practice ◽  
Pressure Coefficients ◽  
Wind Pressure Coefficient ◽  
Detailed Assessment ◽  
Ventilation Rates

Mean wind pressure coefficient (Cp) is one of the major input data for natural ventilation study using building energy simulation approach. Due to their importance, they need to be accurately determined. In current engineering practice, tables and analytical Cp models only give mostly averaged results for simpler models and configurations. Considering the limitation of tables and analytical models, Computational Fluid Dynamics (CFD) could provide a means for an accurate and detailed assessment of Cp. In this paper, we make use of a relatively high resolution, detailed experiments done at Florida Intentional University to validate a CFD modeling of the pressure coefficients Cp. The results show that existing CFD model has a good agreement with experimental results and gives important information of distribution of Cp values over the surface. The local values of the Cp are investigated. In addition, the CFD derived Cp and discharge coefficient (Cd) values are utilized in semi-analytical ventilation models in order to get a more accurate value of ventilation rates.

Mean Wind Pressure Field on the Typical Large-Span Roof Structures

2012 ◽  
Vol 166-169 ◽  
pp. 19-24
Author(s):  
Fang Hui Li ◽  
Ming Gu ◽  
Zhen Hua Ni ◽  
Shi Zhao Shen
Keyword(s):  
Pressure Field ◽  
Pressure Coefficient ◽  
Wind Pressure ◽  
Pressure Data ◽  
Shape Factors ◽  
Local Shape ◽  
Wind Pressure Coefficient ◽  
The Mean ◽  
Urban Terrain ◽  
Wind Pressures

The wind tunnel tests of some typical large roofs, including a saddle roof, pitched roof and domes, are carried out with various terrains which cover suburban and urban exposures. The wind pressure data of roofs are obtained by using the synchronous multi-pressure scanning technique. The wind pressure coefficient and local shape factors of the wind load was investigated. The effects of various terrains on wind pressures of roofs are discussed. From the results, we can see mean pressures of these roofs exposed to the mean pressures exposed to the suburban terrain are 2 or 3 times those exposed to the urban terrain. And the terrains are no directly influence to the wind pressure shape factors.

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