Unsteady attached cavitation on an oscillating hydrofoil

Franc, Jean-Pierre; Michel, Jean-Marie

doi:10.1017/s0022112088002101

Cited by 66 publications

(49 citation statements)

References 8 publications

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“…Furthermore, this implies that bubble/bubble interaction effects play a crucial role in cloud cavitation noise and damage. The theoretical results shed some light on previous experimental observations of cloud cavitation (Bark and Berlekom, 1978;Peterson, 1978, 1980;Bark, 1985;Franc and Michel, 1988;Kubota et al, 1989;Le et al, 1993;Reisman et al, 1994;Reisman and Brennen, 1996;Reisman et al, 1997). Experimental measurements of the noise produced by cloud cavitation all exhibit pressure pulses of very short duration and large amplitude.…”

Section: Discussionsupporting

confidence: 70%

“…Experimental studies have shown that intensive noise and damage potential are associated with the collapse of a cavitating cloud of bubbles (see, for example, Bark and Berlekom, 1978;Peterson, 1978, 1980;Bark, 1985;Franc and Michel, 1988;Kubota et al, 1989;Le et al, 1993;Reisman et al, 1994). Moreover, it has been demonstrated that when clouds of cavitation bubbles collapse coherently, they result in greater material damage (see, for example, Soyama et al, 1992) and greater noise generation (see, for example, Reisman and Brennen, 1996) than would be expected from the cumulative effect of the collapse of the individual bubbles which make up the cloud.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Computation of Shock Waves in a Spherical Cloud of Cavitation Bubbles

Wang

Brennen

1999

Journal of Fluids Engineering

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The nonlinear dynamics of a spherical cloud of cavitation bubbles have been simulated numerically in order to learn more about the physical phenomena occurring in cloud cavitation. A finite cloud of nuclei is subject to a decrease in the ambient pressure which causes the cloud to cavitate. A subsequent pressure recovery then causes the cloud to collapse. This is typical of the transient behavior exhibited by a bubble cloud as it passes a body or the blade of a ship propeller. The simulations employ the fully nonlinear continuum mixture equations coupled with the Rayleigh-Plesset equation for the dynamics of bubbles. A Lagrangian integral method is developed to solve this set of equations. It was found that, with strong bubble interaction effects, the collapse of the cloud is accompanied by the formation of an inward propagating bubbly shock wave. A large pressure pulse is produced when this shock passes the bubbles and causes them to collapse. The focusing of the shock at the center of the cloud produces a very large pressure pulse which radiates a substantial impulse to the far field and provides an explanation for the severe noise and damage potential in cloud cavitation.

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Section: Discussionsupporting

confidence: 70%

Section: Introductionmentioning

confidence: 99%

Numerical Computation of Shock Waves in a Spherical Cloud of Cavitation Bubbles

Wang

Brennen

1999

Journal of Fluids Engineering

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“…In many of these cases the coherent collapse of the cloud of bubbles (see, for example, Figure 3.14) can cause more intense noise and more potential for damage than in a similar nonfluctuating flow (see Section 3.7). Bark and van Berlekom (1978), Shen and Peterson (1978), Franc and Michel (1988), Kubota et al (1989), and Hart et al (1990) have studied the complicated flow patterns involved in the production and collapse of a cavitating cloud on an oscillating hydrofoil. These studies are exemplified by the photographs of Figure 7.14, which show the formation, separation, and collapse of a cavitation cloud on a hydrofoil oscillating in pitch.…”

Section: Cloud Cavitationmentioning

confidence: 99%

Cavitation and Bubble Dynamics

Brennen

2013

945

591

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Cavitation and Bubble Dynamics deals with the fundamental physical processes of bubble dynamics and the phenomenon of cavitation. It is ideal for graduate students and research engineers and scientists, and a basic knowledge of fluid flow and heat transfer is assumed. The analytical methods presented are developed from basic principles. The book begins with a chapter on nucleation and describes both the theory and observations in flowing and non-flowing systems. Three chapters provide a systematic treatment of the dynamics and growth, collapse, or oscillation of individual bubbles in otherwise quiescent fluids. The following chapters summarise the motion of bubbles in liquids, describe some of the phenomena that occur in homogeneous bubbly flows, with emphasis on cloud cavitation, and summarise some of the experimental observations of cavitating flows. The last chapter provides a review of free streamline methods used to treat separated cavity flows with large attached cavities.

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“…Studies of unsteady cloud cavitation around hydrofoils are important to improve the design theory of fluid machinery [1,2] and to understand the mechanisms , due to questions around the cavitation dynamic behavior and the collapse of the cloud of bubbles. However, experimental studies are expensive and have limitations such as the accuracy of lab equipments [3].…”

Section: Introductionmentioning

confidence: 99%

Implicit large eddy simulation of unsteady cloud cavitation around a plane-convex hydrofoil

et al. 2015

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The present research, focuses on the erosive cavitation behavior around a plane convex hydrofoil. For that, Tthe Zwart-Gerber-Belamri cavitation model has been implemented in library form to be used withto carry out in OpenFOAM. Implicit Large Eddy Simulation (ILES) has been applied to analyze the three dimensional unsteady cavitating flow around a plane convexthe hydrofoil. The numerical results corresponding to hydrodynamic conditions that have been experimentally tested at the high speed cavitation tunnel of the École Polytechnique Fédérale de Lausanne (EPFL) show the sheet cavitation development and the shedding and collapse of vapor clouds. It is noted that cavitation evolution including maximum vapor length, detachment and oscillation frequency are fairly well simulated. Furthermore, the pressure pulses due to the cavitation development as well as complex vortex structures are reasonably predicted. Consequently, these results confirm that the present numerical method can be used to investigate unsteady cavitation around hydrofoils with satisfactory accuracy.

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Unsteady attached cavitation on an oscillating hydrofoil

Abstract: International audienc

Cited by 66 publications

References 8 publications

Numerical Computation of Shock Waves in a Spherical Cloud of Cavitation Bubbles

Numerical Computation of Shock Waves in a Spherical Cloud of Cavitation Bubbles

Cavitation and Bubble Dynamics

Implicit large eddy simulation of unsteady cloud cavitation around a plane-convex hydrofoil

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