In actual oil exploration process, vortex-induced vibration (VIV) is the main source of structural fatigue damage of the risers. In this paper, VIV of a flexible cylinder experiencing combined uniform and oscillatory flow is investigated numerically. All investigations are carried out by the in-...
VIV of a circular cylinder in combined steady and oscillatory flow is investigated.Steady to total flow ratio has significant effects on the response.The VIV locks onto the oscillatory flow frequency at low flow ratios and the natural frequency at high flow ratios.Lock-in regime is widened in ...
(2018c) experimentally investigated the FIV characteristics of two side-by-side flexible cylinders inclined at 45° with a center-to-center spacing of 3.0D in a towing tank. In their experiments, three cases, including two side-by-side inclined smooth cylinders, only one of smooth cylinder ...
derived a added mass for a circular cylinder in an inviscid potential flow at relative frame of reference. Eq 4.4, new term, G(t;α) difference compared to fixed frame of reference inertia force = added masss * added-mass acceleration debate: a virtual experiment reveals that the classical...
derived a added mass for a circular cylinder in an inviscid potential flow atrelative frame of reference. Eq 4.4, new term, G(t;α) difference compared to fixed frame of reference inertia force = added masss * added-mass acceleration ...
The quasi-three-dimensional method was employed to simulate the flow past a long stationary cylinder in shear flow. Cellular shedding was observed in its wake. The free transverse flexible vibrations of the same body exhibited significant spanwise correlation over a large length of the body despite...
By analyzing the bending moment near the touchdown point, it is found that under the combination of the ocean current and oscillatory flow the vessel motion may decrease the VIV response, while increase the excited frequencies. In addition, the decreasing rate of the VIV under vessel surge is ...
Published experimental data in [21] present the case for the observed differences in the VIV lock-in development for the one degree-of-freedom (1DOF) rigid cylinder, related to changes in the distance of the end of structure from the wall. The formation of a minor vortex at one end of ...