Nonlinear Dynamics of Variable Mass Oscillators

Pesce, Celso P.; Orsino, Renato M. M.; Silva, Leandro S. P.

doi:10.1007/978-3-031-45101-0_8

Cited by 2 publications

(1 citation statement)

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“…According to [48], FIV, in single phase flows, is classified into three types based on excitation characteristics: extraneously-induced excitation (EIE), instability-induced excitation (IIE) and motioninduced excitation (MIE). Each excitation can lead to four distinct phenomena: vortex-induced-vibration (VIV), vortex-induced-motion (VIM), wake-induced-vibration (WIV), galloping and flutter [14,19,42].…”

Section: Introductionmentioning

confidence: 99%

Coupling of the immersed boundary and Fourier pseudo-spectral methods applied to solve fluid–structure interaction problems

Nascimento,

Mariano,

da Silveira Neto

et al. 2024

J Braz. Soc. Mech. Sci. Eng.

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The current manuscript addresses fluid–structure interaction (FSI) problems to the analysis of vortex-induced vibration (VIV), employing the methodology designated as IMERSPEC2D. The approach seamlessly integrates the Fourier pseudo-spectral method (FPSM) and the immersed boundary method (IBM) to solve the Navier–Stokes (NS) and continuity equations. Simultaneously, the effects of cylindrical structure, involving 1 and 2 degrees of freedom (d.o.f.) are simulated, by incorporating structural motion equations into NS via the IBM source term and implementing a two-way FSI algorithm. In the paper are presented the comparison of low and high-order temporal integration methods applied to solve the dynamic behavior of the structure and the dimensionless of the cylinder’s structural motion equations, resulting in an increase in computational time step from 1E($$-9$$ - 9 ) to 1E($$-3$$ - 3 ). Validation results to refined mesh simulations include the accurate representation of the lock-in phenomenon to simulations of 1 d.o.f. obtaining the range between reduced velocity 5.456 and 5.568 and the maximal amplitude is 0.352. Notably, the eight-shape pattern of the 2 d.o.f. cylinder displacement is obtained and the formation of C2S wake patterns is achieved, as presented by other authors. In conclusion, the dimensionless approach reduces computational time, while the high-order both of IMERSPEC methodology and time advancement integration to FSI improve the results of the cylinder’s motion and alters distinct vortex shedding patterns in fluid dynamics.

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Section: Introductionmentioning

confidence: 99%