Numerical Investigation for Steady and Unsteady Cavitating Flows

Kanfoudi, Hatem; Lamloumi, Hedi; Zgolli, Ridha

doi:10.5772/48421

Cited by 8 publications

(7 citation statements)

References 10 publications

(7 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Cavitating flow is often examined through a water tunnel [3] or water tank test [4]. Computational fluid dynamics (CFD), which has been integrated into commercial software FLUENT and CFX [5][6][7] as well as into open-source [8][9][10][11] and in-house [12][13][14][15][16] software, has been recently introduced as a major approach for investigating cavitation. The cavitating flow of the unsteady cloud around the foil [17][18][19], propeller models [20], and other underwater vehicles [7,21] presents typical problems.…”

Section: Introductionmentioning

confidence: 99%

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Wang

Huang

et al. 2017

Journal of Fluids Engineering

View full text Add to dashboard Cite

Unstable cavitation presents an important speed barrier for underwater vehicles such as hydrofoil craft. In this paper, the authors concern about the physical problem about the cloud cavitating flow that surrounds an underwater-launched hydrofoil near the free surface at relatively high-Froude number, which has not been discussed in the previous research. A water tank experiment and computational fluid dynamics (CFD) simulation are conducted in this paper. The results agree well with each other. The cavity evolution process in the experiment involves three stages, namely, cavity growth, shedding, and collapse. Numerical methods adopt large eddy simulation (LES) with Cartesian cut-cell mesh. Given that the speed of the model changes during the experiment, this paper examines cases with varying constant speeds. The free surface effects on the cavity, re-entry jet location, and vortex structures are analyzed based on the numerical results.

show abstract

Section: Introductionmentioning

confidence: 99%

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Wang

Huang

et al. 2017

Journal of Fluids Engineering

View full text Add to dashboard Cite

show abstract

“…Sound emitted by a marine propeller is also affected by the occurrence of cavitation, which happens due to expansion of small gas nuclei present in the liquid when they are subject to tensile stress in low pressure regions [8]. Close to the design conditions a well designed propeller will typically not experience significant amounts of cavitation, some is still likely to be present if high efficiency, associated with high blade loading, is to be achieved [9,10,11]. The unsteady inflow, ship motions and presence of a wake may also induce additional cavitation mechanisms by causing loading variations [12].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of sheet cavity noise of a hydrofoil using the Ffowcs Williams–Hawkings acoustic analogy

2016

View full text Add to dashboard Cite

Concerns about pollution of the marine environment with ship-induced noise and the scarcity of available numerical methods have recently stimulated significant amounts of research in hydroacoustic modelling. In this work, Large Eddy Simulation (LES) is used with Schnerr-Sauer mass-transfer cavitation model and a porous Ffowcs WilliamsHawkings (FW-H) acoustic analogy in order to simulate sheet cavitation on a NACA0009 hydrofoil. The aim is to investigate how well the proposed method captures the dominant noise sources associated with periodic sheet cavitation. The study further focuses on practical aspects, such as the importance of the non-linear FW-H term and convergence of the acoustic solution depending on the choice of the integration surface. This is done by correlating the radiated noise with integral and local flow quantities, such as cavity volume, lift coefficient and local vapour content. A key finding of the study is that the simulation framework is capable of correctly capturing the monopole nature of the sound generated by an oscillating cavity sheet. Results indicate that the numerical method is incapable of accurately resolving the flow during the final collapse stages of smaller cavity clouds, mainly due to mesh density limitations and the use of an incompressible flow assumption. Lack of small-scale bubble structures also causes the high-frequency range of the noise spectra to be under-predicted. Despite certain limitations the presented method offers a significant insight into the nature of cavitation-dominated noise and allows for some of the dominant sound generating mechanisms to be categorised.

show abstract

“…with : This cavitation model, which is based on the modified model of Rayleigh Plesset, has been validated in many cases, such as cavitating flow around a 2D hydrofoil (Kanfoudi 2012;Kanfoudi 2011;Kanfoudi 2015) and 3D hydrofoil (Kanfoudi 2014).…”

Section: Physical Cavitation Modelmentioning

confidence: 99%

“…Based on (ITTC 1999) , four technique has been employed, Interface-tracking methods ( (Hutton, R.A.;Furness 1975), Heister 1994) , (Deshpande, M.;Feng, J.;Merkle 1998) (Koop 2008;Kozubková, Rautová, and Bojko 2012), (Zwart, P.J. ;Gerber, A.G.;Belamri 2004) and (Kanfoudi 2011(Kanfoudi , 2012(Kanfoudi , 2014(Kanfoudi , 2015 For (Kunz et al 2003) . Owing to their success in capturing the features of cavitation flows, the (Kanfoudi 2011) cavitation model is used in the present paper.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Turbulent Flow Structure Induced by the Cavitation Shedding using LES

Kanfoudi

Bellakhal

Ennouri

et al. 2017

JAFM

View full text Add to dashboard Cite

To analyze the interaction between the turbulent flow structure with the cavitation shedding dynamics, a three-dimensional unsteady cavitating turbulent flow around the three-dimension NACA009 hydrofoil is investigated in this study. The cavitating flow in has been modeled with a homogeneous mixture of liquid and vapor using LES. The interaction between the cavitation and the fluid vortex is analyzed and discussed. The results demonstrate that the vortex stretching is mainly in the center of the cloud cavity and changes quasiperiodically as the cloud cavity evolves. As a result, the mechanism of the inception of cavitation, re-entrant jet and cavitation cloud shedding are accurately captured and predicted by LES in accordance with the experiment data.

show abstract

Numerical Investigation for Steady and Unsteady Cavitating Flows

Cited by 8 publications

References 10 publications

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Cloud Cavitating Flow That Surrounds a Vertical Hydrofoil Near the Free Surface

Characterisation of sheet cavity noise of a hydrofoil using the Ffowcs Williams–Hawkings acoustic analogy

Numerical Analysis of the Turbulent Flow Structure Induced by the Cavitation Shedding using LES

Contact Info

Product

Resources

About