The influence of fluid–structure interaction on cloud cavitation about a stiff hydrofoil. Part 1.

Smith, S.M.; Venning, James A.; Pearce, BW; Young, Yin Lu; Brandner, PA

doi:10.1017/jfm.2020.321

Cited by 45 publications

(31 citation statements)

References 51 publications

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“…The experimental set-up and techniques used in this investigation are described in Parts I (Smith et al 2020a) and II (Smith et al 2020b). As such, this section only briefly summarizes the set-up and techniques for completeness.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…As reviewed above, the frequency of Type II cavity shedding is a function of the cavity length. Deformable hydrofoils with nose-up bend-twist coupling showed an increased cavity length, which reduced the Type II cavity shedding frequency (Pearce et al 2017;Young et al 2018;Smith et al 2020b). Hence, the presence of ventilation or cavitation can lead to very different dynamic responses from fully wetted flow (Young et al 2020).…”

Section: Introductionmentioning

confidence: 99%

“…However, there was little discussion in these two works regarding the modelling of cloud cavitation. Smith et al (2020a) (Part I) and Smith et al (2020b) (Part II) discussed the FSI of a stiff hydrofoil manufactured from Type 316 stainless steel (SS) and a flexible hydrofoil manufactured from a carbon/glass-epoxy composite (CF) structure, respectively. Part II (Smith et al 2020b) also compared the FSI of the two hydrofoils.…”

Section: Introductionmentioning

confidence: 99%

“…Smith et al (2020a) (Part I) and Smith et al (2020b) (Part II) discussed the FSI of a stiff hydrofoil manufactured from Type 316 stainless steel (SS) and a flexible hydrofoil manufactured from a carbon/glass-epoxy composite (CF) structure, respectively. Part II (Smith et al 2020b) also compared the FSI of the two hydrofoils. Both hydrofoils experienced cloud cavitation and supercavitation, and the SS hydrofoil experienced sheet cavitation at higher cavitation numbers.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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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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Section: Experimental Overviewmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…Cavities become susceptible to condensation shockwaves as the speed of sound reduces in bubble flows [6]. This mechanism tends to become more dominant at lower cavitation numbers [1,16].…”

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Control of Cloud Cavitation through Microbubbles

Venning¹,

Pearce²,

Brandner³

2020

Australasian Fluid Mechanics Conference (AFMC)

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The dynamics of cloud cavitation about a 3D hydrofoil are investigated experimentally in a cavitation tunnel with deplete, sparse and abundant freestream nuclei populations. The rectangular-planform, NACA 0015 hydrofoil was tested at a Reynolds number of 1.4 × 10 6 , an incidence of 6 • and a cavitation number of 0.55. High-speed photography of cavitation shedding phenomena was acquired simultaneously with unsteady force measurement to enable identification of cavity shedding modes corresponding with force spectral peaks. Nuclei populations were varied through the injection of polydisperse microbubbles. Both the deplete and abundant cases were characterised by large-scale cloud cavitation. For a sparsely seeded flow, however, coherent fluctuations are significantly reduced due to random nuclei activation and cavity breakup resulting in minimum relative unsteady lift.

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Flow characteristics and diaphragm deformation of pressure‐compensating drip irrigation emitters*

Chen

Wei

et al. 2021

Irrigation and Drainage

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Pressure-compensating (PC) emitters are extensively utilized because they can enhance the irrigation uniformity and the terrain adaptability of drip irrigation systems. To examine the interaction between the elastic diaphragm and fluid of PC emitters, the internal flow behaviour and the diaphragm deformation of PC emitters were studied by one-way and two-way fluid-structure interaction (FSI) numerical simulation methods. The deformation characteristics of the elastic diaphragm, the change of the outflow section around the outlet of the pressure-compensating chamber, and the pressure and velocity distribution of the flow field were analysed in this study. The results illustrate that the deformation process of an elastic diaphragm during the entire working process could be divided into three phases: rapid deformation, slow deformation, and long-term tiny deformation. After the diaphragm contacted convex land, the overflow groove was the only channel where water could flow out of the PC emitters; and as working pressure increased, the increment of the diaphragm deformation was extremely tiny. However, it was the tiny deformation of the elastic diaphragm that maintained the flow rate of the PC emitters constant over a wide range of working pressures. The results can provide references for exploring the pressure-compensating mechanism of PC emitters and their optimal design. K E Y W O R D S diaphragm deformation, flow behaviour, fluid-structure interaction, pressure-compensating emitter Résumé Les émetteurs autorégulants (PC) sont largement utilisés car ils peuvent améliorer l'uniformité de l'irrigation et l'adaptabilité au terrain des systèmes d'irrigation goutte à goutte. Pour examiner l'interaction entre le diaphragme élastique et le fluide des émetteurs PC, le comportement d'écoulement interne et la déformation du diaphragme des émetteurs PC ont été étudiés par des méthodes de simulation numérique d'interaction fluide-structure (FSI) * Caractéristiques d'écoulement et déformation du diaphragme d'émetteurs d'irrigation goutte à goutte autorégulant

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The influence of fluid–structure interaction on cloud cavitation about a stiff hydrofoil. Part 1.

Cited by 45 publications

References 51 publications

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

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

Control of Cloud Cavitation through Microbubbles

Flow characteristics and diaphragm deformation of pressure‐compensating drip irrigation emitters*

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