Numerical study of wind effect on green island wake

Author(s):  
Shin-Jye Liang ◽  
Nan-Jung Kuo ◽  
Dong-Jiing Doong ◽  
Tai-Wen Hsu
2015 ◽  
Vol 315 ◽  
pp. 1141-1150 ◽  
Author(s):  
Tai-Wen Hsu ◽  
Dong-Jiing Doong ◽  
Kai-Jiun Hsieh ◽  
Shin-Jye Liang

Mechanika ◽  
2017 ◽  
Vol 23 (1) ◽  
Author(s):  
Han CHENG ◽  
Lin WEI ◽  
Bin ZHOU ◽  
Qiang HE ◽  
Peng XIAO

2009 ◽  
Author(s):  
P. J. García Nieto ◽  
J. J. del Coz Díaz ◽  
J. A. Vilán Vilán ◽  
C. Casqueiro Placer ◽  
George Maroulis ◽  
...  

Author(s):  
Marc Kainz ◽  
Florian Danner ◽  
Hans-Peter Kau ◽  
Fre´de´ric Le Chuiton

A numerical study into the unsteady aerodynamics of a ducted helicopter tail rotor is presented. Computations were carried out for ideal hover flight conditions and under the influence of side-wind. The results are validated against existing experimental performance data. The investigated numerical model incorporates the full annulus turbomachinery components as well as the entire tail boom including non-axis-symmetric casing contour, drive shaft fairing, fin and stabilisers. The rotor is characterised by an uneven azimuth-wise blade distribution, while the stator vanes complemented by the drive shaft fairing are distributed evenly. For the computational fluid dynamics analysis the fully turbulent three-dimensional Favre-averaged Navier-Stokes equations were solved on a Chimera grid system with 24.7 million cells. Besides thrust and shaft power characteristics, the varying blade loading due to the azimuth-wise position and the side-wind effect is analysed.


2015 ◽  
Vol 12 (6) ◽  
pp. 3199-3233 ◽  
Author(s):  
T.-W. Hsu ◽  
M.-H. Chou ◽  
T.-H. Hou ◽  
S.-J. Liang

Abstract. Green Island located in the typhoon active eastern Taiwan coastal water is the potential Kuroshio power plant site. In this study, a high resolution (250–2250 m) shallow-water equations (SWEs) model is used to investigate the effect of typhoon on the hydrodynamics of Kuroshio and Green Island wake. Two wind induced flows, typhoon Soulik and Holland's wind field model, are studied. Simulation results of the typhoon Soulik indicate that salient characteristics of Kuroshio and downstream island wake seems less affected by the typhoon Soulik because typhoon Soulik is 250 km away Green Island and the wind speed near Green Island is small. Moreover, Kuroshio currents increase when flow is in the same direction as the counterclockwise rotation of typhoon, and vice versa. This finding is in favorable agreements with the TOROS observed data. The SWEs model, forced by the Kuroshio and Holland's wind field model, successfully reproduces the downstream recirculation and meandering vortex street. Numerical results unveil that the slow moving typhoon has a more significant impact on the Kuroshio and downstream Green Island wake than the fast moving typhoon does. Due to the counterclockwise rotation of typhoon, Kuroshio currents increase (decrease) in the right (left) of the moving typhoon's track. This rightward bias phenomenon is evident, especially when typhoon moves in the same direction as the Kuroshio mainstream.


Water ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 3039
Author(s):  
Tien-Hung Hou ◽  
Jen-Yi Chang ◽  
Chia-Cheng Tsai ◽  
Tai-Wen Hsu

The aim of the present study is to apply the three-dimensional Princeton Ocean Model to study the wind effects on Kuroshio-induced island wake in the lee of Green Island, Taiwan. Numerical results indicate that the effect of NE winds squeezes the Kuroshio-induced island vortex street close to the coast and the SW winds tend to push the island vortex street farther away from the coast. The simulated vortex streets are analyzed by the dimensionless spatial lengths to quantify the prescribed feature. By comparing the three-dimensional results with different wind conditions, the Ekman transports are observed and the influence depths of wind effects are studied. Additionally, some cold eddies are found in temperature fields resulting from numerical simulations. These results are in qualitative agreement with field measurements and satellite images.


2014 ◽  
Vol 35 (11-12) ◽  
pp. 4484-4495 ◽  
Author(s):  
Shih-Jen Huang ◽  
Chung-Ru Ho ◽  
Sheng-Lin Lin ◽  
Shin-Jye Liang

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