Analysis of vibration characteristics of pipeline with fluid added mass

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (15) : 182-187.

XIAO Bin1, ZHOU Yulong1, GAO Chao1, CAO Yipeng2, SHI Shuangxia1, LIU Zhigang2

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Abstract

Aiming at problems of fluid-induced vibration (FIV) of structures, considering unidirectional fluid-structure interaction (FSI), effects of flow velocity on vibration characteristics of structure were analyzed through introducing added mass. A straight pipeline conveying fluid was taken as the study object, flow states in pipeline under different flow velocities were simulated with numerical method to obtain fluid pressure coefficient, turbulent kinetic energy and displacement response of pipeline structure. Based on the unidirectional coupling vibration mechanism, the pipeline FSI added mass model was established. The FE method was used to do the structural modal analysis, and calculate the structure’s added mass and natural frequencies due to fluid acting on structure. The numerical simulation results showed that pipeline internal fluid velocity has stronger coupling action on pipeline structure vibration, increase in flow velocity makes coupling added mass increase, and there is a critical flow velocity to cause pipeline having static buckling instability; compared with empirical formula, the calculation results here can more accurately reflect the fluid unidirectional coupling action on structural vibration within the error range of 10%; the proposed method can be applied in analysis of unidirectional coupled vibration problems, and provide a way for studying FIV problems in pipeline flow including effects of FSI on dynamic characteristics of structures.

Key words

fluid-structure interaction (FSI) / fluid added mass / flow-induced vibration (FIV) / flexural natural frequency / pipeline conveying fluid

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XIAO Bin, ZHOU Yulong, GAO Chao, CAO Yipeng, SHI Shuangxia, LIU Zhigang. Analysis of vibration characteristics of pipeline with fluid added mass[J]. Journal of Vibration and Shock, 2021, 40(15): 182-187

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