Investigation of Cavitation Models for Steady and Unsteady Cavitating Flow Simulation

Tran, Tan Dung; Nennemann, Bernd; Vu, Thi Thu Ha; Guibault, François

doi:10.5293/ijfms.2015.8.4.240

Cited by 14 publications

(4 citation statements)

References 38 publications

(65 reference statements)

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“…Because turbulence models are constructed for single-phase flow, CoutierDelgosha et al (2003) proposed a correction for the turbulent viscosity for unsteady cavitation calculations. This correction is successfully applied in the recent study of Tran et al (2015) for the hydrofoil case and by Zhang et al (2015) for the centrifugal pump case. However, in this work, the turbulence model is used in its original form.…”

mentioning

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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confidence: 99%

Prediction of Cavitation Performance of Radial Flow Pumps

Kaya¹,

Ayder

2017

JAFM

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“…In the last decades several CFD approaches have been developed to numerically investigate cavitating flow phenomena. A valuable review of different approaches is for instance provided by [13] and [14] and references therein. Among all the approaches, the most widely applied today is probably the socalled homogeneous transport-equation based model.…”

Section: Introductionmentioning

confidence: 99%

“…The evaluation of the variable density field is based on an equation for void ratio with the source terms modelling the mass transfer rate due to cavitation, generally known as mass transfer model. In the literature there are available several mass transfer models relying on tunable parameters [14] even though interesting solutions for overcoming empiricism have for instance been proposed by [15] and [16].…”

Section: Introductionmentioning

confidence: 99%

Numerical Predictions of Cavitating Flow around a Marine Propeller and Kaplan Turbine Runner with Calibrated Cavitation Models

Morgut¹,

Jošt²,

Škerlavaj³

et al. 2018

SV-JME

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Cavitating phenomena, which may occur in many industrial systems, can be modelled using several approaches. In this study a homogeneous multiphase model, used in combination with three previously calibrated mass transfer models, is evaluated for the numerical prediction of cavitating flow around a marine propeller and a Kaplan turbine runner. The simulations are performed using a commercial computational fluid dynamics (CFD) solver and the turbulence effects are modelled using, alternatively, the Reynolds averaged Navier Stokes (RANS) and scale adaptive simulation (SAS) approaches. The numerical results are compared with available experimental data. In the case of the propeller the thrust coefficient and the sketches of cavitation patterns are considered. In the case of the turbine the efficiency and draft tube losses, along with the cavitation pattern sketches, are compared. From the overall results it seems that, for the considered systems, the three different mass transfer models can guarantee similar levels of accuracy for the performance prediction. For a very detailed investigation of the fluid field, slight differences in the predicted shapes of the cavitation patterns can be observed. In addition, in the case of the propeller, the SAS simulation seems to guarantee a more accurate resolution of the cavitating tip vortex flow, while for the turbine, SAS simulations can significantly improve the predictions of the draft tube turbulent flow. Keywords: cavitation, marine propeller, Kaplan turbine, mass transfer models, RANS, SAS Highlights • CFD simulations of cavitating flow around a marine propeller and Kaplan turbine runner. • Homogeneous model used in combination with three previously calibrated mass transfer models. • Turbulence modelled using RANS and SAS approaches. • Calibrated mass transfer models guarantee similar levels of accuracy. • SAS approach improves the local flow field resolution.

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“…Thus, the computation of two-phase mixture models is much cheap since there is no need to treat the motion of a mass of bubbles separately. These methods are becoming more popular because they can be applied to turbulent flows encountered in most industrial applications [11].…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Unsteady Cavitation in a High-speed Water Jet

Peng¹,

Okada²,

Yang³

et al. 2016

International Journal of Fluid Machinery and Systems

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Concerning the numerical simulation of high-speed water jet with intensive cavitation this paper presents a practical compressible mixture flow method by coupling a simplified estimation of bubble cavitation and a compressible mixture flow computation. The mean flow of two-phase mixture is calculated by URANS for compressible fluid. The intensity of cavitation in a local field is evaluated by the volume fraction of gas phase varying with the mean flow, and the effect of cavitation on the flow turbulence is considered by applying a density correction to the evaluation of eddy viscosity. High-speed submerged water jets issuing from a sheathed sharp-edge orifice nozzle are treated when the cavitation number, σ = 0.1, and the computation result is compared with experimental data The result reveals that cavitation occurs initially at the entrance of orifice and bubble cloud develops gradually while flowing downstream along the shear layer. Developed bubble cloud breaks up and then sheds downstream periodically near the sheath exit. The pattern of cavitation cloud shedding evaluated by simulation agrees experimental one, and the possibility to capture the unsteadily shedding of cavitation clouds is demonstrated. The decay of core velocity in cavitating jet is delayed greatly compared to that in no-activation jet, and the effect of the nozzle sheath is demonstrated.

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Investigation of Cavitation Models for Steady and Unsteady Cavitating Flow Simulation

Cited by 14 publications

References 38 publications

Prediction of Cavitation Performance of Radial Flow Pumps

Prediction of Cavitation Performance of Radial Flow Pumps

Numerical Predictions of Cavitating Flow around a Marine Propeller and Kaplan Turbine Runner with Calibrated Cavitation Models

Numerical Simulation of Unsteady Cavitation in a High-speed Water Jet

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