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• W2769897712 abstract "Abstract This paper presents a novel CFD study on the fluctuations induced in water flow by a single vibrating tube in a parallel triangular array with pitch ratio of 1.57. The simulations have been developed with a commercial code for the resolution of the 2D-URANS equations while allowing mesh updating at each time step, in order to incorporate forced oscillations in the transverse direction for a selected tube. After each simulation, the velocity, vorticity and pressure fields computed at successive time steps were FFT processed to obtain the corresponding distribution of fluctuations in amplitude and phase. This allowed for a convenient analysis of the disturbances inducted in the flow, which is considered key for the development of fluidelastic instability. According to these computations, during the oscillation cycle several vortices are formed around the vibrating tube, some of which are convected downstream at an approximately constant speed. That process determines the amplitude and phase of the velocity and pressure fluctuations throughout the domain, and, in particular, on the surface of the vibrating tube. Results are reported for a range of cross-flow velocities, from very low values up to a reduced gap velocity above 10. The predictions obtained are compared to the results from some other studies in the literature, in particular to the experimental data on the propagation of velocity fluctuations reported by Khalifa et al. (2013a) and to the unsteady lift forces measured by Sawadogo and Mureithi (2014), in both cases for relatively similar configurations. Except for low flow velocity, the fluctuating lift forces result to be destabilizing due to the pressure pulsations on specific areas of the vibrating tube at the wake side, which behave as alternating stagnation regions for the periodic vortical flows induced by the oscillating tube." @default.
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• W2769897712 date "2018-01-01" @default.
• W2769897712 modified "2023-09-23" @default.
• W2769897712 title "A CFD study on the fluctuating flow field across a parallel triangular array with one tube oscillating transversely" @default.
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• W2769897712 doi "https://doi.org/10.1016/j.jfluidstructs.2017.10.014" @default.
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