Numerical Simulation of Circular Cylinder Vortex Flow under Heavy Rain Effects

• Main Authors: Po-Yi Chen, 陳柏禕
• Other Authors: 宛同
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/94266400020454897376

碩士 === 淡江大學 === 航空太空工程學系碩士班 === 100 === In recent years, due to the impact of climate changing, the phenomenon of extreme weather is more frequently compared to the past, such as heavy rain, strong wind, typhoon-weather conditions etc. For the cylindrical structure being located outdoors, we must put these severe weather influences into considerations in the stage of geometry design. Therefore, the importance of numerical simulation for circular cylinder vortex flow under the heavy rain effects can never be neglected. In this work, we first investigated the vortex shedding behind a circular cylinder at Re=100 and 200. Secondly, two circular cylinders in tandem arrangement at Re=200 are simulated also. Through the simulation of these three cases successfully, we will be more confident for the following research. For the heavy rain simulations, the two-phase flow approach plus the wall film mechanism on the body surface are implemented for LP-810 cable and at Re=2.5×104 to 1.0×105. Although the numerical results for the cable under the heavy rain effects show that aerodynamic degradation was not perfectly match to the experimental data, the correct tendency of the cable aerodynamic performance under both the clear weather and heavy rain situations are simulated successfully. The proposed simulation results will be quite useful to understand the industrial suspension cable’s behavior in cross wind and heavy rain conditions.