RANS simulation of unsteady cavitation around a Clark-Y hydrofoil with the assistance of machine learning

Xu, Mengya; Cheng, Huaiyu; Wang, Xincheng

doi:10.1016/j.oceaneng.2021.109058

Cited by 15 publications

(3 citation statements)

References 28 publications

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“…The methods would utilise the experimental or DNS data as their input for their machine learning or deep learning algorithms and use the algorithm output for the traditional field input for turbulence models and are potentially promising. [54,55] 6. Appendix: Implementation of Turbulence models Many of the models discussed in this study are not part of the official OpenFOAM [52] code repository.…”

Section: Discussionmentioning

confidence: 99%

A comparative evaluation of turbulence models for simulation of unsteady cavitating flows

Apte¹,

Ge²,

Coutier-Delgosha³

2023

Preprint

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Cavitation is a complex multiphase phenomenon characterised by vapour bubbles forming due to a sudden pressure drop and is often accompanied by increased hull vibrations, increased radiated noise and decrease in propeller and impeller performance. Although the Reynolds-Averaged Navier-Stokes (RANS) method coupled with a cavitation model is still considered a practical tool to predict cavitating flows owing to its computational efficiency, it is unable to predict the unsteadiness of vapor shedding and over-predicts the eddy viscosity. To improve the prediction, an empirical eddy viscosity correction, [Reboud et al. 1998] was proposed to consider the compressibility effects produced by cavitation. Additionally, a new type of models termed as hybrid RANS-Large Eddy Simulation (LES) models have also been recently introduced in the community, having the ability to behave as a RANS or a LES model in different regions of the flow in order to combine the computational cost efficiency of RANS with the accuracy of LES modelling.However, there exists a lack of a comprehensive review of various such turbulence models like the k-ω Shear Stress Transport Model (SST), k-ω SST Scale-adaptive Simulation (SAS), k-ω SST Detached Eddy Simulation (DES), k-ω SST Delayed Detached Eddy Simulations (DDES), Filter-Based Method (FBM) and Partially-Averaged Navier Stokes Method (PANS) to predict cavitating flows. In this work, we conduct such a review to compare their ability to predict cloud cavitating flows by comparing them with x-ray experimental data in a venturi. It is shown that with mesh

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Section: Discussionmentioning

confidence: 99%

A comparative evaluation of turbulence models for simulation of unsteady cavitating flows

Apte¹,

Ge²,

Coutier-Delgosha³

2023

Preprint

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“…Cavitation is a commonly natural phenomenon caused by local pressure being lower than the saturated vapor pressure, resulting in the formation of steam pockets. These pockets aggregate and collapse with the flow of fluid, not only disrupting the stable flow state but also generating considerable noise and causing damage to nearby surfaces [1,2]. When cavitation occurs in a centrifugal pump, it leads to a decline in the pump's overall performance, accompanied by vibrations, noise, and other unfavorable effects [3,4].…”

Section: Introductionmentioning

confidence: 99%

Application of three cavitation models in centrifugal pump cavitation flow simulation

Xie,

Luo,

Feng

et al. 2024

J. Phys.: Conf. Ser.

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In order to solve the problems of difficult and inaccurate cavitation simulation in centrifugal pumps, this paper adopts the commercial software CFX and realizes the same-platform comparison of Zwart-Gerber-Belamri model, Kunz model and Schner-Saer model in the simulation of centrifugal pumps’ cavitation by using its own language. The research results show that the Schner-Saer model can predict the external characteristics of the pump more accurately without considering the coefficient correction; By adjusting the empirical coefficients, different cavitation models can achieve the same effect; The Kunz model can predict the pressure distribution in the impeller more accurately, and the error is basically kept within 10% except for the local complex flow area; The change of the pump head is more obviously affected by the volume of the vapour in impeller, but weakly affected by the morphology of the vapour.

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“…Zhu et al [40] further investigated the different stages of cavitation life using the Stress-Blended Eddy Simulation (SBES) turbulent model, which yielded results that closely matched experimental data. Some new models based on the existing ones were also proposed recently [41,42].…”

Section: Introductionmentioning

confidence: 99%

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

Huang,

2024

Applied Sciences

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Submerged cavitating jets can effectively remove marine organisms from ship hulls without damaging the surface paint. To enhance the cleaning efficiency of cavitating jets, the selection of an appropriate nozzle structure and the design of an efficient cleaning device are crucial. In this study, the submerged cavitation effect of different nozzles was analyzed by numerical simulation. The actual cleaning efficacy of the nozzles was confirmed through erosion experiments as well. The simulation and experiment showed that the shear nozzle, absent of a pre-shrinking section and featuring a spherical outlet connected to a diffusion cylindrical section, maintained stable erosion performance at a standoff distance of 30–50 mm. This erosion was primarily attributed to denudation caused by bubble collapse. Based on this shear nozzle, a self-rotating cleaning device was designed and manufactured. A test rig was also established to test the cleaning effect and some parameters of the cleaning device.

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RANS simulation of unsteady cavitation around a Clark-Y hydrofoil with the assistance of machine learning

Cited by 15 publications

References 28 publications

A comparative evaluation of turbulence models for simulation of unsteady cavitating flows

A comparative evaluation of turbulence models for simulation of unsteady cavitating flows

Application of three cavitation models in centrifugal pump cavitation flow simulation

Research on Erosion Effect of Various Submerged Cavitating Jet Nozzles and Design of Self-Rotating Cleaning Device

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