Numerical Simulation of Vortex Induced Vibration of A Flexible Cylinder

Mojtaba Hosseini; Hamid reza Ashrafi; Peyman Beiranvand; Ahmad Dehestani; Kiuomars Dehestani

doi:10.5293/IJFMS.2017.10.4.457

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자료유형: 학술저널

저자정보: Mojtaba Hosseini (Lorestan University) Hamid reza Ashrafi (Razi University) Peyman Beiranvand (Lorestan University) Ahmad Dehestani (Islamic Azad University) Kiuomars Dehestani (Islamic Azad University)

저널정보: 한국유체기계학회 International Journal of Fluid Machinery and Systems International Journal of Fluid Machinery and Systems Vol.10 No.4

발행연도: 2017.12

수록면: 457 - 463 (7page)

DOI: 10.5293/IJFMS.2017.10.4.457

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Numerical simulations of vortex-induced vibration of a three-dimensional flexible Cylinder under uniform turbulent flow are calculated when Reynolds number is 1.35×104. In order to achieve the vortex-induced vibration, the three-dimensional unsteady, viscous, incompressible Navier-Stokes equation and LES turbulence model are solved with the finite volume approach, the Cylinder is discretized according to the finite element theory, and its dynamic equilibrium equations are solved by the Newmark method. The fluid-Cylinder interaction is realized by utilizing the diffusion-based smooth dynamic mesh method. Considering VIV system, the variety trends of lift coefficient, drag coefficient, displacement, vertex shedding frequency, phase difference angle of Cylinder are analyzed under different frequency ratios. The nonlinear phenomena of locked-in, phase-switch are captured successfully. Meanwhile, the limit cycle and bifurcation of lift coefficient and displacement are analyzed using trajectory, phase portrait and Poincare sections. The results reveal that: when drag coefficient reaches its minimum value, the transverse amplitude reaches its maximum and the “lock-in” begins simultaneously. In the range of “lock-in”, amplitude decreases gradually with increasing of frequency ratio. When lift coefficient reaches its minimum value, the phase difference, between lift coefficient and lateral displacement, undergoes a suddenly change from the “out-of-phase” to the “in-phase” mode. There is no bifurcation of lift coefficient and lateral displacement occurred in three dimensional flexible Cylinder submitted to uniform turbulent flow.

#Vortex-induced #dimensional #finite element #lift coefficient

참고문헌 (23)

참고문헌 신청

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[학술지(정기간행물)] - Griffin O M. / 1980 / Vortex-excited cross flow vibrations of a single circular cylinder / ASME Journal of Pressure Vessel Technology 102 : 258 ~ 166

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