Development of an active gust generation mechanism on a wind tunnel for wind engineering and industrial aerodynamics applications

2006 ◽  
Vol 9 (5) ◽  
pp. 369-386 ◽  
Author(s):  
Fred L. Jr. Haan ◽  
Partha P. Sarkar ◽  
Nicholas J. Spencer-Berger
Keyword(s):  
Wind Tunnel ◽  
Generation Mechanism ◽  
Wind Engineering

Wind Pressure Coefficients Determination for Pre-Homogenization Storage in Cement Mill

2011 ◽  
Vol 94-96 ◽  
pp. 1026-1030
Author(s):  
Yue Ming Luo ◽  
Yue Yin ◽  
Xi Liang Liu
Keyword(s):  
Wind Tunnel ◽  
Spherical Shell ◽  
Rapid Development ◽  
Wind Tunnel Test ◽  
Wind Pressure ◽  
Wind Engineering ◽  
Pressure Coefficients ◽  
Continuous Innovation ◽  
Structural Style ◽  
Wind Pressures

Due to the increasing of wind disaster, structural wind engineering arouses more and more attention recently, with rapid development on spatial structure and continuous innovation of structural style. The main purpose of structural wind engineering is to calculate the wind pressure coefficients of structure. In this paper, the numerical wind tunnel method (NWTM), based on the Computational Fluid Dynamics (CFD), is applied to study wind load. The wind pressure coefficients of reticulated spherical shell with the 4.6m high wall were first determined, using the NWTM. The results are then compared with the wind tunnel test (WTT) and good agreement is found. The feasibility and reliability of NWTM were then verified. As the second example, NWTM is carried out to predict wind-induced pressure on reticulated spherical shell without wall. Further the distribution behavior of wind pressures on this kind of structures is discussed which could provide professionals the reference for the design of structure.

scholarly journals FLOW INDUCED VIBRATION IN SQUARE CYLINDER OF VARIOUS ANGLES OF ATTACK

2022 ◽  
Vol 23 (1) ◽  
pp. 358-369
Author(s):  
Nur Ain Shafiza Ramzi ◽  
Kee Quen Lee ◽  
NUR AMIRA BALQIS MOHD ZAINURI ◽  
HOOI SIANG KANG ◽  
NOR’AZIZI OTHMAN ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Engineering ◽  
Kuala Lumpur ◽  
Velocity Range ◽  
Square Cylinder ◽  
Flow Induced Vibration ◽  
Rigid Cylinder ◽  
Square Cylinders

An experimental study was carried out to identify the effect of angle of attack on flow-induced vibration (FIV) of square cylinders. The experiment was conducted at the Aeronautical and Wind Engineering Laboratory (AEROLAB), UTM Kuala Lumpur using a wind tunnel that was free from external wind conditions. A supporting structure was designed and fabricated to conduct this experiment. The importance of this support structure was to enable the rigid cylinder to suspend and vibrate freely upon excitation of wind speed. The results were analysed through the response of amplitude and frequency of the rigid cylinder over a velocity range of 0.5m/s to 4.0m/s. The results showed that for a square cylinder of ?=0°, vortex-induced vibration (VIV) occurred at low reduced velocity (UR) in range of 5 ? UR ? 10 and galloping occurred at higher reduced velocity which started at UR=15. A tranquil zone was found between VIV and galloping in the reduced velocity range of 10 ? UR ? 15. As for ?=22.5° and 45°, only VIV response was found at low reduced velocity in range of 4? UR ? 9. ABSTRAK: Satu kajian eksperimentasi telah dilakukan bagi mengenal pasti pengaruh sudut serangan oleh getaran cetusan-aliran (FIV) dalam silinder persegi. Eksperimen ini dijalankan di Makmal Kejuruteraan Aeronautika dan Angin (AEROLAB), UTM Kuala Lumpur dengan menggunakan terowong angin yang bebas dari pengaruh angin luar. Struktur sokongan telah direka dan difabrikasi bagi tujuan eksperimen ini. Ini penting bagi membolehkan silinder pegun tergantung dan bergetar dengan bebas semasa ujian kelajuan angin. Dapatan kajian dianalisis melalui tindak balas amplitud dan frekuensi silinder pegun pada kadar halaju 0.5m/s sehingga 4.0m/s. Hasil kajian menunjukkan bahawa bagi silinder persegi ? = 0 °, getaran pengaruh-vorteks (VIV) berlaku pada halaju rendah (UR) dalam julat 5 ? UR ? 10 dan getaran lebih teruk telah ketara berlaku pada kadar halaju berkurang iaitu bermula pada UR = 15. Zon tenang dijumpai antara VIV dan getaran teruk pada kadar halaju berkurang 10 ? UR ? 15. Adapun pada ? = 22.5° dan 45°, hanya tindak balas VIV dijumpai pada halaju rendah dalam kadar 4? UR ? 9.

scholarly journals Wind tunnel tests of aeroelastic models of overhead transmission lines under different snow and ice covers

2019 ◽  
Vol 17 (4) ◽  
pp. 155-169
Author(s):  
Andrzej Flaga ◽  
Łukasz Flaga ◽  
Piotr Krajewski ◽  
Aleksander Pistol
Keyword(s):  
Wind Tunnel ◽  
Transmission Lines ◽  
Wind Engineering ◽  
Similarity Criteria ◽  
Overhead Transmission Lines ◽  
The Subject ◽  
Univer Sity ◽  
Aeroelastic Vibrations ◽  
Snow And Ice

In the first part of this paper, similarity criteria were elaborated for investiga-tions of aeroelastic sectional models of high voltage line wires. These criteria consider wire vibrations caused by aeroelastic phenomena: vortex excitation, wake galloping and interfer-ence between the wires causing vibration in aerodynamic trace of other wires. Second part of the paper describes the tests conducted in Wind Engineering Laboratory of Cracow Univer-sity of Technology. The subject of this set of tests was identifi cation of aeroelastic vibrations caused by aeroelastic interference of wires, mainly determination of critical velocity of wires galloping and wake galloping for selected cases of snow and ice covers on the wires.

Numerical Simulation of Flow around High-Rise Buildings Based on Reynolds Stress Model

2014 ◽  
Vol 580-583 ◽  
pp. 3057-3061
Author(s):  
Zu Peng Zhang ◽  
Wei Zhang ◽  
Guo Ping Chen
Keyword(s):  
Wind Tunnel ◽  
Reynolds Stress ◽  
Reynolds Stress Model ◽  
Wind Engineering ◽  
Stress Model ◽  
High Rise ◽  
Tunnel Model ◽  
Inflow Turbulence ◽  
Model Equations ◽  
Good Agreement

In this paper, a modified inlet atmosphere boundary layer (ABL) which satisfies the turbulence model equations is applied to computational wind engineering. The new inflow turbulence boundary condition applied to simulating the flow in the cavity is verified that it is more in line with the actual flows, and then it is used to establish the numerical wind tunnel model to simulate the flow around high-rise buildings. The results are in good agreement with the wind tunnel experimental data, which show the modified ABL combined with Reynolds Stress Model (RSM) is able to better simulate the flow around high-rise buildings.

scholarly journals Wind action on flat roofs

2014 ◽  
Vol 13 (2) ◽  
pp. 239-246
Author(s):  
Tomasz Lipecki
Keyword(s):  
Wind Tunnel ◽  
Cross Section ◽  
Pressure Coefficient ◽  
Wind Engineering ◽  
Wind Action ◽  
High Rise ◽  
Wind Structure ◽  
University Of Technology ◽  
Mean Pressure ◽  
Flat Roofs

The paper deals with the wind action on flat roofs of rectangular shapes which can be considered for medium-rise and high-rise buildings. Distributions of mean pressure coefficient Cp on flat roofs were measured. All analyses were based on model measurements which had been performed in the boundary layer wind tunnel in Wind Engineering Laboratory of Cracow University of Technology. Vertical, fixed in the floor of the wind tunnel on the turn table rectangular prisms of the ratio of cross-section dimensions 1:2 and 1:4 were investigated. Measurements were carried out for the angle of wind attack in the range 0°-90°, every 15°. The influence of the wind structure on pressures was investigated in six different cases of the approaching wind.

scholarly journals Wind effects on tall buildings according to own measurements and code approach

2013 ◽  
Vol 12 (2) ◽  
pp. 143-150 ◽  
Author(s):  
Tomasz Lipecki
Keyword(s):  
Wind Tunnel ◽  
Cross Section ◽  
Tall Buildings ◽  
Wind Pressure ◽  
Wind Engineering ◽  
Bending Moments ◽  
Wind Effects ◽  
Wind Action ◽  
University Of Technology ◽  
The Cross

The paper presents the analysis of the wind action on tall buildings carried out in accordance with the recommendations of Eurocode 1, and with the results of own research conducted in the wind tunnel of the Wind Engineering Laboratory, Cracow University of Technology. Ten buildings of the same proportions were analyzed, five structures with the ratio of the cross-section dimensions of 1:2 and five of 1:4. The wind action on the longer side (N1) and on the shorter side (N2) were adopted in all cases of buildings. The total forces of wind pressure as well as displacements of top and bending moments at the base of the buildings were taken as the results which allowed to compare two different approaches.

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