Experimental study of the steady fluid–structure interaction of flexible hydrofoils

Zarruk, Gustavo A.; Brandner, PA; Pearce, BW; Phillips, Andrew W.

doi:10.1016/j.jfluidstructs.2014.09.009

Cited by 85 publications

(32 citation statements)

References 26 publications

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“…The geometry, in conjunction with a span-wise alignment of the fibre orientation, was intentionally chosen to principally consider bending deformation only of the flexible hydrofoil. A modified NACA-0009 section profile with a thicker trailing edge was selected for improved manufacture of the flexible composite model (see [18] for further details). Deflection measurements [18] showed that the maximum tip bending deflection of the flexible hydrofoil was 15% of the mean chord and negligible twist deformation, while the stainless steel hydrofoil was nominally rigid.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…A modified NACA-0009 section profile with a thicker trailing edge was selected for improved manufacture of the flexible composite model (see [18] for further details). Deflection measurements [18] showed that the maximum tip bending deflection of the flexible hydrofoil was 15% of the mean chord and negligible twist deformation, while the stainless steel hydrofoil was nominally rigid. The force data for the stainless steel model was found to be nominally invariant with Reynolds number for α ≤ 6°.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…The flexible (composite) model was manufactured as a carbon/glass-epoxy hybrid structure with the lay-up sequence that yield quasi-isotropic response. The construction procedure is detailed in [18]. The nominally rigid (stainless steel) model was machined from a 316 grade stainless steel billet.…”

Section: Experimental Overviewmentioning

confidence: 99%

“…The nominally rigid (stainless steel) model was machined from a 316 grade stainless steel billet. First mode natural frequencies were obtained in air at 96 Hz and 112 Hz, and in water at 54 and 40 Hz for the stainless steel (rigid) and composite (flexible) models, respectively, determined from impact tests and hydrofoil loading spectra [18].…”

Section: Experimental Overviewmentioning

confidence: 99%

See 3 more Smart Citations

The Influence of Fluid-Structure Interaction on Cloud Cavitation About a Hydrofoil

Smith¹,

Venning²,

Brandner³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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The dynamics of cloud cavitation about rigid and flexible 3D hydrofoils is investigated in a cavitation tunnel. The two hydrofoils have identical undeformed geometry of tapered planform, NACA-0009 section and cantilevered setup at the hydrofoil root. The rigid model is made of stainless steel and the flexible model of carbon and glass-fibre reinforced epoxy resin with an effectively quasi-isotropic lay-up without material bend-twist coupling. Tests were conducted at a fixed incidence of 6°, a chord-based Reynolds number of 0.7×10 6 and a cavitation number ranging from 1.0 to 0.2. Unsteady force measurements were made simultaneously with high-speed imaging to enable correlation of forces and with cavity dynamics. High-resolution force spectra at discrete cavitation numbers and separate pressure sweeps were taken to acquire spectrograms of frequency response as a function of cavitation number. Three shedding modes, designated as types 1, 2 and 3, are apparent for both rigid and flexible hydrofoils although significant differences in peak amplitudes were observed. Types 2 and 3 shedding occur at high cavitation numbers where frequency varied with cavitation number and high-speed imaging showed the dominant shedding mechanism to be due to re-entrant jet formation. The type 1 shedding that developed with reduction in cavitation number, once cavity lengths grew to about full-chord, occurred at a nominally constant frequency. In this case, the imaging showed the dominant mechanism to be shockwave formation. This behaviour has been reported upon extensively in literature although there are some new features apparent from the data. The flexibility of the composite hydrofoil was found to increase the magnitude of the force fluctuations for the low frequency type 1 mode compared to the rigid hydrofoil. However, hydrofoil flexibility was seen to dampen the fluctuating magnitude of the high-frequency type 2 and 3 modes, despite being close to the hydrofoil's natural frequency.

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Section: Experimental Overviewmentioning

confidence: 99%

Section: Experimental Overviewmentioning

confidence: 99%

Section: Experimental Overviewmentioning

confidence: 99%

Section: Experimental Overviewmentioning

confidence: 99%

See 2 more Smart Citations

The Influence of Fluid-Structure Interaction on Cloud Cavitation About a Hydrofoil

Smith¹,

Venning²,

Brandner³

et al. 2018

Proceedings of the 10th International Symposium on Cavitation (CAV2018)

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show abstract

“…The effect of material and Reynolds number on the hydrodynamic performance of hydrofoils was investigated experimentally by Zarruk et al [15]. They studied the performances of flexible hydrofoils of similar geometry made of stainless steel, aluminum and a composite of carbon-fiber reinforced plastic with layup orientations at 0 • and 30 • .…”

Section: Introductionmentioning

confidence: 99%

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Arab

Augier

Deniset

et al. 2019

JMSE

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In this work, a collaborative experimental study has been conducted to assess the effect an imposed internal pressure has on the controlling the hydrodynamic performance of a compliant composite hydrofoil. It was expected that the internal pressure together with composite structures be suitable to control the hydrodynamic forces as well as cavitation inception and development.A new concept of morphing hydrofoil was developed and tested in the cavitation tunnel at the French Naval Academy Research Institute. The experiments were based on the measurements of hydrodynamic forces and hydrofoil deformations under various conditions of internal pressure. The effect on cavitation inception was studied too. In parallel to this experiment, a 2D numerical tool was developed in order to assist the design of the compliant hydrofoil shape. Numerically, the fluid-structure coupling is based on an iterative method under a small perturbation hypothesis. The flow model is based on a panel method and a boundary layer formulation and was coupled with a finite-element method for the structure. It is shown that pressure driven compliant composite structure is suitable to some extent to control the hydrodynamic forces, allowing the operational domain of the compliant hydrofoil to be extended according to the angle of attack and the internal pressure. In addition, the effect on the cavitation inception is pointed out.

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Some Aspects of Experimental Investigations of Fluid Induced Vibration in a Hydrodynamic Tunnel for Naval Applications

Astolfi

2021

Flinovia—Flow Induced Noise and Vibration Issues and Aspects-Iii

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Experimental study of the steady fluid–structure interaction of flexible hydrofoils

Cited by 85 publications

References 26 publications

The Influence of Fluid-Structure Interaction on Cloud Cavitation About a Hydrofoil

The Influence of Fluid-Structure Interaction on Cloud Cavitation About a Hydrofoil

Morphing Hydrofoil Model Driven by Compliant Composite Structure and Internal Pressure

Some Aspects of Experimental Investigations of Fluid Induced Vibration in a Hydrodynamic Tunnel for Naval Applications

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