A comparative study of cavitation models in a Venturi flow

Charrière, Boris; Decaix, Jean; Goncalves, Éric

doi:10.1016/j.euromechflu.2014.10.003

Cited by 46 publications

(27 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…However, a numerical overestimation is evident in the downstream region. This same trend in terms of fluctuations, when a Spalart-Allmaras model is used, has been observed in previous studies (see for example [36]), where the influence of several turbulence models has been assessed. This is a real issue when SA turbulence model is considered.…”

Section: Forward Propagation Of the Three Sources Of Uncertaintiessupporting

confidence: 66%

About the uncertainty quantification of turbulence and cavitation models in cavitating flows simulations

Congedo

Goncalves

2015

European Journal of Mechanics - B/Fluids

View full text Add to dashboard Cite

International audiencePrediction in numerical simulation of turbulent cavitating flows is strongly influenced by the presence of several empirical coefficients.The aim of the present paper is to explore the interaction between the cavitation model and turbulence in terms of uncertainty propagation through an unsteady numerical solver, for assessing the robustness and the accuracy of the physical models at different times. Furthermore, the influence of experimental data in the setting of some turbulence and cavitation model coefficients is investigated by means of a Bayesian approach. Finally, the interest is to provide some innovative insights for improving the understanding of these models for cavitating flows

show abstract

Section: Forward Propagation Of the Three Sources Of Uncertaintiessupporting

confidence: 66%

About the uncertainty quantification of turbulence and cavitation models in cavitating flows simulations

Congedo

Goncalves

2015

European Journal of Mechanics - B/Fluids

View full text Add to dashboard Cite

show abstract

“…The difficulties in turbulence modeling in cavitating flows and proposed approaches have been described elsewhere in Refs. . Reboud et al made the argument that the standard k – ε model tends to produce high turbulent viscosity ( μ t ) predictions in the cavity wake, resulting in an underprediction of the re‐entrant jet, and thus resulting in a stable cavity.…”

Section: Resultsmentioning

confidence: 99%

Modeling hydrodynamic cavitation in venturi: influence of venturi configuration on inception and extent of cavitation

Simpson

Ranade

2018

AIChE Journal

View full text Add to dashboard Cite

in Wiley Online Library (wileyonlinelibrary.com)Hydrodynamic cavitation (HC) is useful for intensifying a wide variety of industrial applications including biofuel production, emulsion preparation, and wastewater treatment. Venturi is one of the most widely used devices for HC. Despite the wide spread use, the role and interactions among various design and operating parameters on generated cavitation is not yet adequately understood. This article presents results of computational investigation into the cavitation characteristics of different venturi designs over a range of operating conditions. Influence of the key geometric parameters such as the length of venturi throat and diffuser angle on the inception and extent of cavitation is discussed quantitatively. Formulation and solution of multiphase computational fluid dynamics (CFD) models are presented. Appropriate turbulence and cavitation models are selected and solved using a commercial CFD code. Care was taken to eliminate the influence of numerical parameters like mesh density, discretization scheme, and convergence criteria. The computational model was validated by comparing simulated results with three published data sets. The simulated results in terms of velocity and pressure gradients, vapor volume fractions and turbulence quantities, and so on, are critically analyzed and discussed. Diffuser angle was found to have a significant influence on cavitation inception and evolution. The length of the venturi throat has relatively less impact on cavitation inception and evolution compared to the diffuser angle. The models and simulated flow field were used to simulate detailed time-pressure histories for individual vapor cavities, including turbulent fluctuations. This in turn can be used to simulate cavity collapse and overall performance of HC device as a reactor. The presented results offer useful guidance to the designer of HC devices, identifying key operating and design parameters that can be manipulated to achieve the desired level of cavitational activity. The presented approach and results also offer a useful means to compare and to evaluate different designs of cavitation devices and operating parameters.

show abstract

“…Modeling turbulent cavitating flow is quite a challenging task because it is highly dynamic, involving strong interaction with two‐phase structures, and non‐equilibrium thermodynamic states . Based on the treatment of the two‐phase flows, numerical studies fall into two categories: the interface fitting (tracking) model and the continuum model.…”

Section: Numerical Studymentioning

confidence: 99%

Cavitation in Diesel Fuel Injector Nozzles and its Influence on Atomization and Spray

2018

View full text Add to dashboard Cite

In combustors, high‐pressure fuel injector nozzles are employed for liquid atomization and spray generation. The internal flow within nozzles, especially cavitation, plays an important role in promoting the breakup of liquid jets. The formation mechanism and evolvement of cavitation are reviewed and described. Different cavitation regimes were characterized experimentally and the positive effect of cavitation on liquid atomization was confirmed. Different empirical formulas correlating the discharge coefficient with fluid‐dynamical parameters are summarized. The applicability, advantages, and disadvantages of two popular computational models for flow modeling, i.e., the interface tracking model and the homogeneous equilibrium model, are reviewed. The effects of cavitation on the generated spray are discussed.

show abstract

A comparative study of cavitation models in a Venturi flow

Cited by 46 publications

References 38 publications

About the uncertainty quantification of turbulence and cavitation models in cavitating flows simulations

About the uncertainty quantification of turbulence and cavitation models in cavitating flows simulations

Modeling hydrodynamic cavitation in venturi: influence of venturi configuration on inception and extent of cavitation

Cavitation in Diesel Fuel Injector Nozzles and its Influence on Atomization and Spray

Contact Info

Product

Resources

About