Review of numerical models of cavitating flows with the use of the homogeneous approach

Niedźwiedzka, Agnieszka; Schnerr, Günter; Sobieski, Wojciech

doi:10.1515/aoter-2016-0013

Cited by 38 publications

(19 citation statements)

References 25 publications

(29 reference statements)

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“…Source terms in the transport equation for the volume fraction are modeled, considering the evaporation and condensation processes. Niedzwiedzka et al (2016) gave a detailed overview of the available models that can be used with homogenous approach. These models are generally validated with hydrofoil, venturi, or cylinder test cases.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Cavitation Performance of Radial Flow Pumps

Kaya¹,

Ayder

2017

JAFM

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Cavitation is a major problem in pump design and operation because this phenomenon may lead to various types of instabilities, including hydraulic performance loss and catastrophic damage to the pump material caused by bubble collapse. Therefore, it is critical to predict the cavitation performance of the pump in the design phase itself. The motivation of this study is to develop a systematic methodology to calculate the cavitation performance of radial flow pumps. In the first step of the present work, a cavitating nozzle flow case for which the bubble dynamic behavior is accurately resolved in literature is studied numerically. Subsequently, the capabilities of three cavitation models, implemented in the commercial code Fluent, are evaluated for three radial flow pumps designed at specific speeds ns = 10.4, 22.4, and 34.4. The numerical results are validated with global quantities based on net positive suction head (NPSH) measurements. The results led to the determination of reasonably accurate NPSH values for the defined range of specific speeds.

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Section: Introductionmentioning

confidence: 99%

Prediction of Cavitation Performance of Radial Flow Pumps

Kaya¹,

Ayder

2017

JAFM

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“…In this type of models, the phasechange rate is controlled using a source term which is typically derived from the Rayleigh-Plesset (R-P) equation, as shown in [9][10][11][12]. A detailed review of such models can be found in [13,14]. The single-fluid approach for modelling cavitation uses an equation of state (EoS), which relates density and speed of sound with pressure and temperature.…”

mentioning

confidence: 99%

Numerical simulation of cavitation and atomization using a fully compressible three-phase model

2018

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The aim of this paper is to present a fully compressible three-phase (liquid, vapour and air) model and its application to the simulation of in-nozzle cavitation effects on liquid atomization. The model employs a combination of homogeneous equilibrium barotropic cavitation model with an implicit sharp interface capturing VoF approximation. The numerical predictions are validated against the experimental results obtained for injection of water into the air from a step-nozzle, which is designed to produce asymmetric cavitation along its two sides. Simulations are performed for three injection pressures, corresponding to three different cavitation regimes, referred to as cavitation inception, developing cavitation and hydraulic-flip. Model validation is achieved by qualitative comparison of the cavitation, spray pattern and spray cone angles. The flow turbulence in this study is resolved using the Large Eddy Simulation approach. The simulation results indicate that the major parameters that influence the primary atomization are cavitation, liquid turbulence and, to a smaller extent, the Rayleigh-Taylor and Kelvin-Helmholtz aerodynamic instabilities developing on the liquid/air interface. Moreover, the simulations performed indicate that periodic entrainment of air into the nozzle occurs at intermediate cavitation numbers, corresponding to developing cavitation (as opposed to incipient and fully-developed cavitation regimes); this transient effect causes a periodic shedding of the cavitation and air clouds and contributes to improved primary atomization. Finally, the cone angle of the spray is found to increase with increased injection pressure but drops drastically when hydraulic-flip occurs, in agreement with the relevant experiments.

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“…On the other hand, the TEM incorporate a transport equation for the mass and volume fraction that regulates the mass transfer between the two phases. The transport equation is usually based on a simplified version of the main equation of bubble dynamics, the Rayleigh-Plesset equation, which relates bubble growth with the internal bubble pressure conditions [24]. A great number of models have been proposed in order to describe the net mass transfer between the liquid and vapour phase at the bubble interface.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

Mousmoulis

Aggidis

Anagnostopoulos

2021

Applied Mathematical Modelling

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An important flow mechanism that can affect the performance and efficiency, as also the maintenance cost of centrifugal pumps is cavitation. Scientific research has been focusing on the mechanisms that govern cavitation in order to develop experimental and numerical tools that are able either to detect the phenomenon or to anticipate its appearance. In this study, a computational model is used in order to study the cavitation performance of a radial flow centrifugal pump with a semi open impeller. The numerical model includes and studies the effects of the blade tip clearance and its thickness, and it is validated against corresponding laboratory measurements and visualization data obtained for this pump under normal and cavitating flow conditions. The total head drop variation curves versus cavitation parameter are extracted both numerically and experimentally, and compared for various pump loading conditions with satisfactory agreement. A non-periodic pattern of flow and cavitation bubbles between the impeller blades, which is caused by the inlet pipe bending, is also well reproduced by the model. The numerical results display in detail the complex flow field and the secondary flows developed in the tip clearance area, close to the blades leading edge. The effects of the latter on the onset and development of cavitation at the suction side of the impeller, as well as on the backflow cavitation phenomenon are presented and analyzed. Backflow cavitation is found to affect the suction ability of the pump, especially for moderate cavitation conditions, as far as the pressure differences between the two blade sides remain significant.

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Review of numerical models of cavitating flows with the use of the homogeneous approach

Cited by 38 publications

References 25 publications

Prediction of Cavitation Performance of Radial Flow Pumps

Prediction of Cavitation Performance of Radial Flow Pumps

Numerical simulation of cavitation and atomization using a fully compressible three-phase model

Numerical simulation of the performance of a centrifugal pump with a semi-open impeller under normal and cavitating conditions

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