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Hydrodynamics of the Semi-Immersed Cylinder by Forced Oscillation Model Testing 被引量:1
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作者 SONG Chun-hui FU Shi-xiao +3 位作者 TANG Xiao-ying HU Ke MA Lei-xin REN Tong-xin 《China Ocean Engineering》 SCIE EI CSCD 2018年第1期110-116,共7页
In this paper, the hydrodynamic coefficients of a horizontal semi-immersed cylinder in steady current and oscillatory flow combining with constant current are obtained via forced oscillation experiments in a towing ta... In this paper, the hydrodynamic coefficients of a horizontal semi-immersed cylinder in steady current and oscillatory flow combining with constant current are obtained via forced oscillation experiments in a towing tank. Three nondimensional parameters(Re, KC and Fr) are introduced to investigate their effects on the hydrodynamic coefficients.The experimental results show that overtopping is evident and dominates when the Reynolds number exceeds 5×105 in the experiment. Under steady current condition, overtopping increases the drag coefficient significantly at high Reynolds numbers. Under oscillatory flow with constant current condition, the added mass coefficient can even reach a maximum value about 3.5 due to overtopping while the influence of overtopping on the drag coefficient is minor. 展开更多
关键词 semi-immersed cylinder hydrodynamic coefficient forced oscillation experiment OVERTOPPING
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Prediction Model for Vortex-Induced Vibration of Circular Cylinder with Data of Forced Vibration 被引量:3
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作者 潘志远 崔维成 刘应中 《China Ocean Engineering》 SCIE EI 2007年第2期239-254,共16页
A model based on the data from forced vibration experiments is developed for predicting the vortex-induced vibra- tions (VIV) of elastically mounted circular cylinders in flow. The assumptions for free and forced vi... A model based on the data from forced vibration experiments is developed for predicting the vortex-induced vibra- tions (VIV) of elastically mounted circular cylinders in flow. The assumptions for free and forced vibration tests are explored briefly. Energy equilibrium is taken into account to set up the relationship between the dynamic response of selfexcited oscillations and the force coemcients from forced vibration experiments. The gap between these two cases is bridged straightforwardly with careful treatment of key parameters. Given reduced mass m^# and material damping ratio of an elastically mounted circular cylinder in flow, the response characteristics such as amplitude, frequency, lock-in range, added mass coefficient, cross-flow fluid force and the corresponding phase angle can be predicted all at once. In- stances with different combination of reduced mass and material damping ratio are compared to investigate their effects on VIV. The hysteresis phenomenon can be interpreted reasonably. The predictions and the results from recent experiments carried out by Wifliamson' s group are in rather good agreement. 展开更多
关键词 vortex-induced vibration (VIV) forced oscillation experiments response prediction model
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