Study of fluid–structure interaction with undulating flow using channel driven cavity flow system

An experimental setup was designed and fabricated for the channel driven cavity flow in order to provide benchmark data for validation of any numerical analysis program for solving fluid–structure interaction (FSI) problems. The channel driven cavity flow is a modification from the lid-driven cavity flow. To provide the fluid–structure interaction, the bottom face of the cavity is a deformable flat plate. All other boundaries are rigid. The fluid motion inside the cavity is driven by the flow through a narrow channel topside of the cavity. To establish suitable boundary conditions for numerical analyses of the experiment, the inlet of the channel has a given fluid velocity, while its outlet has a known pressure. Water is used as the fluid in this study. Multiple strain gages and laser displacement sensors were used to measure dynamic responses of the plate attached at the bottom of the cavity.

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Effect of longitudinal periodic length on chaotic mixing in a lid-driven cavity flow system

Journal of Non-Newtonian Fluid Mechanics ◽

10.1016/j.jnnfm.2018.08.009 ◽

2018 ◽

Vol 261 ◽

pp. 81-98 ◽

Cited By ~ 1

Author(s):

Baiping Xu ◽

Liang He ◽

Meigui Wang ◽

Lih-Sheng Turng

Keyword(s):

Flow System ◽

Cavity Flow ◽

Chaotic Mixing ◽

Driven Cavity ◽

Driven Cavity Flow

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The influence of fluid–structure interaction on cloud cavitation about a rigid and a flexible hydrofoil. Part 3

Journal of Fluid Mechanics ◽

10.1017/jfm.2021.1017 ◽

2022 ◽

Vol 934 ◽

Author(s):

Yin Lu Young ◽

Jasmine C. Chang ◽

Samuel M. Smith ◽

James A. Venning ◽

Bryce W. Pearce ◽

...

Keyword(s):

Shock Wave ◽

Dynamic Load ◽

Fluid Structure Interaction ◽

Cavitation Number ◽

Cloud Cavitation ◽

Fluid Structure ◽

Driven Cavity ◽

Structure Interaction ◽

Cavity Shedding ◽

Lock In

Experimental studies of the influence of fluid–structure interaction on cloud cavitation about a stiff stainless steel (SS) and a flexible composite (CF) hydrofoil have been presented in Parts I (Smith et al., J. Fluid Mech., vol. 896, 2020a, p. A1) and II (Smith et al., J. Fluid Mech., vol. 897, 2020b, p. A28). This work further analyses the data and complements the measurements with reduced-order model predictions to explain the complex response. A two degrees-of-freedom steady-state model is used to explain why the tip bending and twisting deformations are much higher for the CF hydrofoil, while the hydrodynamic load coefficients are very similar. A one degree-of-freedom dynamic model, which considers the spanwise bending deflection only, is used to capture the dynamic response of both hydrofoils. Peaks in the frequency response spectrum are observed at the re-entrant jet-driven and shock-wave-driven cavity shedding frequencies, system bending frequency and heterodyne frequencies caused by the mixing of the two cavity shedding frequencies. The predictions capture the increase of the mean system bending frequency and wider bandwidth of frequency modulation with decreasing cavitation number. The results show that, in general, the amplitude of the deformation fluctuation is higher, but the amplitude of the load fluctuation is lower for the CF hydrofoil compared with the SS hydrofoil. Significant dynamic load amplification is observed at subharmonic lock-in when the shock-wave-driven cavity shedding frequency matches with the nearest subharmonic of the system bending frequency of the CF hydrofoil. Both measurements and predictions show an absence of dynamic load amplification at primary lock-in because of the low intensity of cavity load fluctuations with high cavitation number.

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