Density current impact on a horizontal cylinder:Experimental flow field and force analysis

• Main Authors: Chi-Shian Yeh, 葉祈賢
• Other Authors: Herve Capart
• Format: Others
• Language: en_US
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/11445762334251555249

碩士 === 國立臺灣大學 === 土木工程學研究所 === 100 === The aim of this thesis is to analysis the flow field and the force as the density current passing a horizontal cylinder. Where submarine cables and pipelines across submarine canyons, there is a danger that they will be damaged or destroyed by turbidity currents. To model this risk, the present thesis reports simplified experiments in which density currents impact a horizontal cylinder. The aim of the experiments is to simultaneously measure the force and flow field, and to relate one to the other. Laser-illuminated imaging is used to measure the unsteady velocity and density fields. On the other hand, a strain gauge is used to measure the associated force exerted on the cylinder. Inverse modeling is preformed to evaluate the pressure field and force from the velocity and density measurements, using the pressure Poisson equation. The modeled force was then compared to data retrieved from the strain gauge to evaluate the accuracy.