Experimental investigation on the flow-induced vibration of a free-hanging flexible riser by internal unstable hydrodynamic slug flow

Mode switching and standing-travelling waves in slug flow-induced vibration of catenary riser

“…It is seen that the number of peaks and troughs of the modal shape in the in-plane direction is one more than that in the out-of-plane direction for the same mode, due to the in-plane catenary configuration. (2016) and Zhu et al (2018aZhu et al ( , 2019a. Therefore, only the in-plane response is discussed in the following sections.…”

“…Through a nonintrusive measurement, Zhu et al (2018a) reported that a vigorous SIV response occurs when a consistent long liquid slug travels through the riser. The in-plane SIV is dominated by the fundamental mode in the gas-liquid flow rate ratio range of 0.5-1.827.…”

Experimental Investigation for The Flow Induced Vibration for Pipe Inside Water

“…The results showed that the present study is more accurate for calculating the critical velocities of c-p and p-p pipes. However, for c-c pipes it was not so unless a higher flow rate is used Dayang et al [5] investigated the Fluid-Structure Interaction (FSI) effect on structural dynamic responses of AP1000 shield building with empty and filled water tanks and to find the optimum height of water level for decreasing seismic response under inputs of earthquake excitations. They used nonlinear FSI algorithm of finite element method based on ANSYS platform in order to compare with the experimental results of structural seismic responses and fluid free vibration.…”

Two-phase flow induced vibrations in a marine riser conveying a fluid with rectangular pulse train mass

“…A general thing to observe is that the SLWR develops large amplitude vibrations close to the bottom end, which is explained by two facts: one is the vast amount of energy which is extracted from the system throughout the path of the slug flow (Zhu et al, 2018), and another is the acceleration of the riser at the buoyancy section by the passing masses…”

“…It was concluded that the said flow amplifies the dynamic components of the riser's response. Recently, Zhu et al (2018) performed experiments in an air-water test loop, where the in-plane vibrations, out-of-plane vibrations and the flow structure were observed inside a transparent silica gel tube in catenary configuration by means of high speed cameras. Results showed that the lateral vibrations are negligible, and hence, the idea of using planar motion models seems to be a plausible approximation.…”