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.

Experimental Study on the Four Pipes Self-Supporting Steel Chimney

2013 ◽  
Vol 805-806 ◽  
pp. 1413-1415
Author(s):  
Zi Hou Yuan ◽  
Yi Chen Yuan ◽  
Wei Sun
Keyword(s):  
Pressure Coefficient ◽  
The Body ◽  
Wind Pressure ◽  
Test Results ◽  
Wind Speeds ◽  
Coefficient Distribution ◽  
Average Wind ◽  
Extreme Wind ◽  
Wind Pressure Coefficient ◽  
Rigid Model

In the first test segment (12m×16m) of 8m×6m wind tunnel with simulation of atmospheric boundary layer, we did first measuring pressure test research on rigid model of four tube self-supporting steel chimney, and got average wind pressure coefficient, maximum and minimum wind pressure coefficient distribution, as well as wind loads body coefficient of this structure, thus gave the body coefficient and extreme wind load envelopes of two species height chimney. The results show that in two wind speeds, the test results have good coincidence, reasonable value, and good regularity.

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.

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.

Sign in / Sign up

Export Citation Format

Share Document