The effect of yaw angle on VIV suppression for an inclined flexible cylinder fitted with helical strakes

Cross-Flow Vortex-Induced Vibration (VIV) Responses and Hydrodynamic Forces of a Long Flexible and Low Mass Ratio Pipe

“…Therefore, a reconstruction algorithm based on the model analysis technique was adopted. It was originally proposed by Lie and Kaasen [27] and subsequently applied in the experimental works of [16,17,[21][22][23][25][26][27][28].…”

“…During the tests, it was towed in still water along the water tank to implement a uniform fluid flow condition. A similar device has been used in our earlier experiments, in which the streamwise VIV [23] and the VIV reduction of a flexible cylinder fitted with helical strakes [25,26] were studied. Figure 1 shows the sketch of the experimental setup.…”

Application of Control Rods for Passively Suppressing Cross‐Flow VIV of an Inclined Flexible Cylinder

“…Moreover, how to alleviate or control this kind of oscillation is one of the most challenging topics in industry and academia. Several representative devices and methods for VIV suppression have been proposed during the past few decades [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23].…”

“…e former one needs to rely on external energy to interfere with the flow field around the structure and disrupt the vortex shedding, e.g., a sound excitation or suction, while the passive control method is to deform the configuration of the bluff-body altering the roughness or implementing extra devices without the input of external energy. Several typical passive control devices, such as helical strakes [10][11][12][13][14][15][16] and control rods [17][18][19][20][21][22][23], have been widely recognized and applied in practical engineering situations. ey show superiorities in both economic cost and VIV suppression effectiveness.…”

“…In real engineering applications, the existence of inclination angle, a (where a is the angle between the main cylinder axis and the plane orthogonal to the oncoming flow), can cause secondary flow, leading to an even more comprehensive flow field interference phenomenon. Xu et al [16] pointed out that the inclination angle has a significant influence on the suppression efficiency of another common and successful VIV suppression device, helical strakes. e VIV suppression effectiveness of helical strakes deteriorated with the increase of inclination angle.…”