Dynamics of unsteady cavitating flow in compressible two-phase fluid

Zhang, Lingxin; Khoo, Boo Cheong

doi:10.1016/j.oceaneng.2014.06.005

Cited by 23 publications

(5 citation statements)

References 24 publications

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“…It is noted that for steady flow computations, the pressure-density coupling scheme only affects the convergence path and the final solution is independent of the choice because of the nature of pressure-correlation [29]. The conclusions are verified that the calculations for quasi-steady cavitation based on the incompressible fluids for both liquid and gas phase obtained the quite accordant results with the experimental data [20,30] and the compressible calculations [31]. Therefore, Eq.…”

Section: Methodssupporting

confidence: 62%

Calculation and verification of dynamical cavitation model for quasi-steady cavitating flow

Zhang

Zhu

Qiu

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Methodssupporting

confidence: 62%

Calculation and verification of dynamical cavitation model for quasi-steady cavitating flow

Zhang

Zhu

Qiu

et al. 2015

International Journal of Heat and Mass Transfer

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“…5 The speed of sound in the water-vapor mixture of a cavitating flow is so low that the compressibility of the mixture cannot be ignored. [6][7][8] Such multiphase flows can be characterized by small confined areas in the fluid domain, where the compressibility of the fluid is important, even though most of the fluid domain is incompressible. From a numerical analysis perspective, the main difficulties in dealing with this type of flow are due to the different behaviors of the incompressible and compressible fluids and the discontinuity in the fluid density across the material interface.…”

Section: Introductionmentioning

confidence: 99%

Simulation of compressibility of entrapped air in an incompressible free surface flow using a pressure‐based method for unified equations

Shin

2020

Numerical Methods in Fluids

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Summary A pressure‐based method is developed to solve the unified conservation laws for incompressible and compressible fluids. A polytropic law is used to model the compressibility of a gas and decouple the energy equation. The pressure field is calculated by solving a single‐pressure Poisson equation for the entire flow domain. The effects of the compressibility of the gas are reflected in the source term of the Poisson equation. The continuities of pressure and normal velocity across a material interface are achieved without any additional treatment along the interface. To validate the developed method, the oscillation of a water column in a closed tube due to the compression and expansion of air in the tube is simulated. The computed time history of the pressure at the end wall of the tube is in good agreement with other computational results. The free drop of a water column in a closed tank is simulated. The time history of the pressure at the center of the bottom of the tank shows good agreement with other reported results. The developed code is applied to simulate the air cushion effect of entrapped air in a dam break flow. The computed result is in good agreement with other experimental and computational results until the air is entrapped. As the entrapped air pocket undergoes rapid pulsation, the pressure field of water around the air pocket oscillates synchronously.

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“…The mechanism for the cavitation control for the transient flow can be explained as the high pressure induced by obstacles, and Zhang and Cheong 35 thoroughly investigated the cavitation excited pressure waves by the blunt cylindrical object and also analyzed the transient pressure distribution around the blunt object, which can also be interpreted as the control process of cavitation in a centrifugal pump. Figure 9 shows the transient pressure distribution and the vapor volume fraction.…”

Section: Effects Of Obstacles On Pressure Distributionmentioning

confidence: 99%

“…Time sequence of the fields of the volume fraction and the contours of the pressure. 35 the middle plane is also shown to compare the effects of different obstacles.…”

Section: Effects Of Obstacles On Pressure Distributionmentioning

confidence: 99%

An active method to control cavitation in a centrifugal pump by obstacles

Zhao

2017

Advances in Mechanical Engineering

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In this article, we proposed an active method of obstacle attached on the blade to control cavitation in centrifugal pump. The modified shear stress transport k-v model with a local density correction for turbulent eddy viscosity combined with Kubota cavitation model was employed to simulate three-dimensional unsteady flow. The simulated external performance agreed fairly well with experiment observation. The results show that the obstacles of appropriate height can cause little disturbance to external performance. The over-high obstacle can cause larger perturbation to deteriorate the flow field at large flow rate point. The obstacle of appropriate height can induce relative high pressure and optimize the flow structure to suppress the cavitation, which is the main mechanism of cavitation control in a centrifugal pump. The passages would be blocked if over-high obstacle is arranged, which is bad to suppress the cavitation in centrifugal pumps. The effects of 1/2 the outlet width of impeller for cavitation suppression are optimal when the bubbles reach close to the obstacle, which degrade the amplitude of dominate frequency and simultaneously attenuate the bubble volume. When cavitation completely developed, the obstacle of any height can keep the cavity volume attenuating and 1/2 of the outlet width of impeller is best.

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Dynamics of unsteady cavitating flow in compressible two-phase fluid

Cited by 23 publications

References 24 publications

Calculation and verification of dynamical cavitation model for quasi-steady cavitating flow

Calculation and verification of dynamical cavitation model for quasi-steady cavitating flow

Simulation of compressibility of entrapped air in an incompressible free surface flow using a pressure‐based method for unified equations

An active method to control cavitation in a centrifugal pump by obstacles

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