Structural responses and vortex-induced force of flexible risers undergoing vortex-induced vibration in uniform flow

Song Lei-Jian1, 2, Fu Shi-Xiao1,2, Ren Tie1,2,3, Yu Dapeng4, Zhang Mengmeng1,2

Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (22) : 14-21.

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PDF(1947 KB)
Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (22) : 14-21.

Structural responses and vortex-induced force of flexible risers undergoing vortex-induced vibration in uniform flow

  • Song Lei-Jian1, 2, Fu Shi-Xiao1,2, Ren Tie1,2,3, Yu Dapeng4, Zhang Mengmeng1,2
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Abstract

In this study, the structural responses and vortex-induced forces of flexible risers undergoing vortex-induced vibration (VIV) in uniform flow were investigated. The VIV response characteristics are analyzed using the measured strains. Then, using the Euler Bernoulli beam structure dynamic equation and the least square method, the vortex-induced force coefficients in cross-flow (CF) and in-line (IL) direction were also be computed. The results indicate that that VIV of the flexible riser under uniform current is steady vibration with the amplitude and dominant frequency independent with time and the dominant frequency in the IL direction is twice as much as that in the CF direction. The excitation coefficients of flexible riser do not always agree with those obtained by the forced oscillation tests: some excitation coefficients are even negative within the usual defined exciting non-dimensional frequency regime, and are related with not only the non-dimensional frequency and amplitude but also phase angles of the CF&IL displacements. In the CF direction, when the non-dimensional frequency varies from 0.13 to 0.22, the added-mass coefficient oscillates between 1.5 and 3.0; In the IL direction, the added mass coefficient increases quickly from -1.0 to 1.2 and then keeps constantly when the non-dimensional frequency varies from 0.26 to 0.42.

Key words

Flexible riser / Vortex-induced vibration / Hydrodynamic force / Excitation coefficient / Added-mass coefficient

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Song Lei-Jian1, 2, Fu Shi-Xiao1,2, Ren Tie1,2,3, Yu Dapeng4, Zhang Mengmeng1,2. Structural responses and vortex-induced force of flexible risers undergoing vortex-induced vibration in uniform flow[J]. Journal of Vibration and Shock, 2017, 36(22): 14-21

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