scholarly journals NUMERICAL ANALYSIS OF OUTDOOR SOUND FIELD CONSIDERING THE EFFECTS OF GROUND SURFACE GEOMETRY AND WIND FLOW OVER COMPLEX TERRAINS

2010 ◽  
Vol 66 (1) ◽  
pp. 35-45
Author(s):  
Shinji HIEJIMA ◽  
Yasuhiko MUKAI ◽  
Kengo YOSHIKI
Keyword(s):  
Numerical Analysis ◽  
Ground Surface ◽  
Sound Field ◽  
Wind Flow ◽  
Surface Geometry

The Effect of Ground Surface Geometry on the Wing Lift Coefficient

2021 ◽  
pp. 653-662
Author(s):  
Dinh Khoi Tran ◽  
Anh Tuan Nguyen
Keyword(s):  
Lift Coefficient ◽  
Ground Surface ◽  
Surface Geometry

Preliminary Study on Long-Term Flooding After the Tsunami

2017 ◽  
Vol 12 (4) ◽  
pp. 741-747
Author(s):  
Toshitaka Baba ◽  
Junichi Taniguchi ◽  
Noriko Kusunoki ◽  
Manabu Miyoshi ◽  
Hiroshi Aki ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Large Scale ◽  
Water Exchange ◽  
Ground Surface ◽  
Flow Modeling ◽  
Tsunami Waveforms ◽  
Long Time ◽  
Preliminary Study ◽  
Nankai Earthquake

After the Nankai earthquake in 1946, the resultant flooding lasted for a long time, because seawater remained on land after the tsunami in Kochi city. Large-scale flooding occurred in Ishinomaki city immediately after the Great East Japan Earthquake in 2011. Long-term flooding may hamper disaster responses such as rescue and recovery activities. This paper studied the risks of long-term flooding after the Nankai earthquake in Tokushima city based on a paleographical survey and numerical analysis. The paleographical survey identified statements such as “seawater sometimes flowed onto the land at the full tide,” suggesting occurrences of long-term flooding after previous Nankai earthquakes. The numerical analysis separately calculated values inside and outside the levee. The tsunami waveforms outside the analysis area obtained by tsunami numerical simulation was used as the boundary condition of the inland flow modeling, that is water was introduced inside the levee when the tsunami water level exceeded the upper end of the levee. The two layers of ground surface and the drain were defined to calculate the flow, including water exchange between the two layers, and the water was drained forcefully outside the levee using a drainage pump. The possibility of long-term flooding in the analysis area is suggested when a large-scale earthquake occurs in the Nankai trough.

124 Numerical Analysis of Sound Field by Slit-like Expansions in a Duct

2000 ◽  
Vol 2000.49 (0) ◽  
pp. 47-48
Author(s):  
Yuki ITOH ◽  
Yasuji TSUBAKISHTA
Keyword(s):  
Numerical Analysis ◽  
Sound Field

scholarly journals A Numerical Analysis of Wind Flow within and above Idealised Modified Terraced House Canyon in Malaysia

2016 ◽  
Vol 169 ◽  
pp. 289-296
Author(s):  
Mohamad Nor Hafidz Arif Razali ◽  
Sheikh Ahmad Zaki ◽  
Mohamed Sukri Mat Ali ◽  
Norio Arai
Keyword(s):  
Numerical Analysis ◽  
Wind Flow

scholarly journals Experimental and Numerical Analysis of a Seawall’s Effect on Wind Turbine Performance

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3877 ◽  
Author(s):  
Hyun-Goo Kim ◽  
Wan-Ho Jeon
Keyword(s):  
Numerical Analysis ◽  
Wind Speed ◽  
Wind Tunnel ◽  
Wind Turbine ◽  
Flow Separation ◽  
Wind Farm ◽  
Wind Tunnel Experiment ◽  
Scale Model ◽  
Wind Flow ◽  
Cfd Analysis

For the purposes of this study, a wind tunnel experiment and a numerical analysis during ebb and high tides were conducted to determine the positive and negative effects of wind flow influenced by a seawall structure on the performance of wind turbines installed along a coastal seawall. The comparison of the wind flow field between a wind tunnel experiment performed with a 1/100 scale model and a computational fluid dynamics (CFD) analysis confirmed that the MP k-turbulence model estimated flow separation on the leeside of the seawall the most accurately. The CFD analysis verified that wind speed-up occurred due to the virtual hill effect caused by the seawall’s windward slope and the recirculation zone of its rear face, which created a positive effect by mitigating wind shear while increasing the mean wind speed in the wind turbine’s rotor plane. In contrast, the turbulence effect of flow separation on the seawall’s leeside was limited to the area below the wind turbine rotor, and had no negative effect. The use of the CFD verified with the comparison with the wind tunnel experiment was extended to the full-scale seawall, and the results of the analysis based on the wind turbine Supervisory Control and Data Acquisition (SCADA) data of a wind farm confirmed that the seawall effect was equivalent to a 1.5% increase in power generation as a result of a mitigation of the wind profile.

Numerical analysis of residual stress in a ground surface layer

1994 ◽  
pp. 497-502 ◽  
Author(s):  
Masahiko YOSHINO ◽  
Takahiro SHIRAKASHI ◽  
Toshiyuki OBIKAWA
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Numerical Analysis ◽  
Ground Surface

A numerical analysis for the directional sound field generated by parametric speakers

2019 ◽  
Vol 2019.32 (0) ◽  
pp. 221
Author(s):  
Hitoshi YOSHIKAWA ◽  
Takahiro WAKAHARA ◽  
Masaki TANIGAWA
Keyword(s):  
Numerical Analysis ◽  
Sound Field
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