Modeling of turbulent, isothermal and cryogenic cavitation under attached conditions

Tseng, Chien-Chou; Wei, Yingjie; Wang, Guoyu; Shyy, Wei

doi:10.1007/s10409-010-0342-7

Cited by 18 publications

(19 citation statements)

References 77 publications

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“…As mentioned above, cavitation occurs when fluid pressure drops below the vapor pressure at a constant ambient temperature [28][29][30][31]. With cavitation, other associated phenomena such as turbulence, noise, vibration and erosion may occur [20].…”

Section: Cavitation and Cavitating Flow: An Overviewmentioning

confidence: 99%

Use of Multibeam and Dual-Beam Sonar Systems to Observe Cavitating Flow Produced by Ferryboats: In a Marine Renewable Energy Perspective

Francisco

Carpman

Temiz

et al. 2017

JMSE

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Abstract:With the prospect to deploy hydrokinetic energy converters in areas with heavy boat traffic, a study was conducted to observe and assess the depth range of cavitating flow produced by ferryboats in narrow channels. This study was conducted in the vicinity of Finnhamn Island in Stockholm Archipelago. The objectives of the survey were to assess whether the sonar systems were able to observe and measure the depth of what can be cavitating flow (in a form of convected cloud cavitation) produced by one specific type of ferryboats frequently operating in that route, as well as investigate if the cavitating flow within the wake would propagate deep enough to disturb the water column underneath the surface. A multibeam and a dual-beam sonar systems were used as measurement instruments. The hypothesis was that strong and deep wake can disturb the optimal operation of a hydrokinetic energy converter, therefore causing damages to its rotors and hydrofoils. The results showed that both sonar system could detect cavitating flows including its strength, part of the geometrical shape and propagation depth. Moreover, the boat with a propeller thruster produced cavitating flow with an intense core reaching 4 m of depth while lasting approximately 90 s. The ferry with waterjet thruster produced a less intense cavitating flow; the core reached depths of approximately 6 m, and lasted about 90 s. From this study, it was concluded that multibeam and dual-beam sonar systems with operating frequencies higher than 200 kHz were able to detect cavitating flows in real conditions, as long as they are properly deployed and the data properly analyzed.

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Section: Cavitation and Cavitating Flow: An Overviewmentioning

confidence: 99%

Use of Multibeam and Dual-Beam Sonar Systems to Observe Cavitating Flow Produced by Ferryboats: In a Marine Renewable Energy Perspective

Francisco

Carpman

Temiz

et al. 2017

JMSE

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“…With the appearance of the filter function in Eq. (23), the sensitivity to inlet turbulent quantities is reduced [29].…”

Section: Governing Equations and Turbulence Modelmentioning

confidence: 98%

“…The filter-based model (FBM) [29][30][31][32] is adopted. This model limits the influence of the eddy viscosity based on the local numerical resolution, thus essentially forming a combined direct numerical simulation and RANS model.…”

Section: Governing Equations and Turbulence Modelmentioning

confidence: 99%

A cavitation model for computations of unsteady cavitating flows

2015

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A local vortical cavitation (LVC) model for the computation of unsteady cavitation is proposed. The model is derived from the Rayleigh-Plesset equations, and takes into account the relations between the cavitation bubble radius and local vortical effects. Calculations of unsteady cloud cavitating flows around a Clark-Y hydrofoil are performed to assess the predictive capability of the LVC model using well-documented experimental data. Compared with the conventional Zwart's model, better agreement is observed between the predictions of the LVC model and experimental data, including measurements of time-averaged flow structures, instantaneous cavity shapes and the frequency of the cloud cavity shedding process. Based on the predictions of the LVC model, it is demonstrated that the evaporation process largely concentrates in the core region of the leading edge vorticity in accordance with the growth in the attached cavity, and the condensation process concentrates in the core region of the trailing edge vorticity, which corresponds to the spread of the rear component of the attached cavity. When the attached cavity breaks up and moves downstream, the condensation area fully transports to the wake region, which is in accordance with the dissipation of the detached cavity. Furthermore, using vorticity transport equations, we also find that the periodic formation, breakup, and shedding of the sheet/cloud cavities, along with the associated baroclinic torque, are important mechanisms for vorticity production and modification. When the attached cavity grows, the liquid-vapour interface that moves towards the trailing edge enhances the vorticity in the attached cav-B Guoyu Wang ity closure region. As the re-entrant jet moves upstream, the wavy/bubbly cavity interface enhances the vorticity near the trailing edge. At the end of the cycle, the break-up of the stable attached cavity is the main reason for the vorticity enhancement near the suction surface.

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“…Although various cavitation models have been categorized and documented, for example in Refs. [24][25][26][27][28][29], there is, to date, no established method capable of predicting the actual loads due to cavitation on the inducer blades. The unsteadiness of the cavitating pump can be coupled with the feed or discharge system, causing large component oscillations.…”

Section: Cavitation In Cryogenic Fluidsmentioning

confidence: 99%

“…The details are well-documented in Refs. [24][25][26][27][28]. Generally, a cavitation model is a transport equation for the liquid volume fraction , which can be written in the following form…”

Section: Physical Modelmentioning

confidence: 99%

Surrogate-based modeling and dimension reduction techniques for multi-scale mechanics problems

Shyy

Cho

et al. 2011

Acta Mech Sin

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Successful modeling and/or design of engineering systems often requires one to address the impact of multiple "design variables" on the prescribed outcome. There are often multiple, competing objectives based on which we assess the outcome of optimization. Since accurate, high fidelity models are typically time consuming and computationally expensive, comprehensive evaluations can be conducted only if an efficient framework is available. Furthermore, informed decisions of the model/hardware's overall performance rely on an adequate understanding of the global, not local, sensitivity of the individual design variables on the objectives. The surrogate-based approach, which involves approximating the objectives as continuous functions of design variables from limited data, offers a rational framework to reduce the number of important input variables, i.e., the dimension of a design or modeling space. In this paper, we review the fundamental issues that arise in surrogate-based analysis and optimization, highlighting concepts, methods, techniques, as well as modeling implications for mechanics problems. To aid the discussions of the issues involved, we summarize recent efforts in investigating cryogenic cavitating flows, active flow control based on dielectric barrier discharge concepts, and lithium (Li)-ion batteries. It is also stressed that many multi-scale mechanics problems can naturally benefit from the surrogate approach for "scale bridging."

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Modeling of turbulent, isothermal and cryogenic cavitation under attached conditions

Cited by 18 publications

References 77 publications

Use of Multibeam and Dual-Beam Sonar Systems to Observe Cavitating Flow Produced by Ferryboats: In a Marine Renewable Energy Perspective

Use of Multibeam and Dual-Beam Sonar Systems to Observe Cavitating Flow Produced by Ferryboats: In a Marine Renewable Energy Perspective

A cavitation model for computations of unsteady cavitating flows

Surrogate-based modeling and dimension reduction techniques for multi-scale mechanics problems

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