DES Prediction of Cavitation Erosion and Its Validation for a Ship Scale Propeller

Ponkratov, Dmitriy

doi:10.1088/1742-6596/656/1/012055

Cited by 9 publications

(4 citation statements)

References 1 publication

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“…Several studies have been conducted to compare the performance of hybrid RANS-LES models with RANS models and experimental data for simulating cavitation. Ponkratov & Caldas [7] used a Detached Eddy simulation (DES) along with erosion functions to predict cavitation erosion near the leading edge of a rudder caused by a ship propeller. Although the model could predict cavitation on a global scale, it under-predicted the size of cavity and the area of the collapsing region although it could predict the erosion damage accurately.…”

Section: Introductionmentioning

confidence: 99%

Simulating Cloud Cavitation Using Detached Eddy Simulation And Other Hybrid Turbulence Models

Apte¹,

Ge²,

Coutier-Delgosha³

2023

World Congress on Momentum, Heat and Mass Transfer

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Cavitation is defined as the formation of bubbles resulting from a sharp drop in vapor pressure at a near constant liquid temperature. Both numerical and experimental methods are needed to study this phenomenon in detail. On the numerical side, the cavitation-turbulence coupling in the process makes cavitating flows difficult to model. One particular approach, using a homogeneous Transport-Equation Model (TEM) coupled with a turbulence model has been utilized in this study where the influence of a hybrid RANS-LES turbulence model on the turbulence properties and its ability to behave as an LES model properly is investigated. The Detached Eddy Simulation (DES), Delayed DES (DDES) and Improved DDES (IDDES) are coupled with the Merkle cavitation model to simulate cloud cavitating flow inside a venturi using interPhaseChangeFoam, a multiphase flow solver in OpenFOAM. Comparisons are made for void fraction and turbulence properties on the global and local scale by comparing them with high-fidelity data obtained from X-ray Particle Image Velocimetry (PIV) experiments.

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Section: Introductionmentioning

confidence: 99%

Simulating Cloud Cavitation Using Detached Eddy Simulation And Other Hybrid Turbulence Models

Apte¹,

Ge²,

Coutier-Delgosha³

2023

World Congress on Momentum, Heat and Mass Transfer

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“…And while there are several studies in model scale, investigations on full scale propellers are very limited. In one of the first attempts to predict cavitation erosion on ship scale, Ponkratov and Caldas (2015) and Ponkratov (2015), estimated cavitation aggressiveness on the rudder and the propeller, respectively. The results showed good correlation with the actual eroded areas.…”

Section: Introductionmentioning

confidence: 99%

Cavitation erosion risk assessment on a full-scale steerable thruster

et al. 2022

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“…It was determined that a simulation that considers the rough wall offers a more accurate prediction of the frictional resistance and the total resistance, which is closer to the extrapolation results of the test. Based on the detached-eddy simulation (DES) model, Ponkratov (2015) of Lloyd's Register (LR) carried out a full-scale propeller cavitation simulation. In comparison to the ship observation results, the sheet cavitation was well simulated; however, the tip vortex cavitation was not reproduced well.…”

Section: Introductionmentioning

confidence: 99%

Simulation strategy of the full-scale ship resistance and propulsion performance

Guo

Sun

Wang

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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The ship powering performance can be predicted based on model tests or simulations. However, differences exist between the full-scale ship performance and extrapolated model data. Therefore, research on full-scale ship performance simulation has important scientific significance and engineering value. This study used the REGAL general cargo vessel to perform full-scale ship resistance and self-propulsion simulations for various grid numbers, time step sizes, and wall Y+ values and compared the calculation and empirical results. The resistance components, waveform, Courant-Friedrichs Lewy (CFL) number, pressure field, and wake flow field of various resistance simulation conditions were analysed. The wall Y+ value was observed to affect the capture of boundary layer flow, ship pressure field evolution, and waveform, which subsequently affect the ship resistance. A Y+ value within 200 was considered to be appropriate when simulating the powering performance of a full-scale ship. The waveform evolution was significantly affected by the time step size, which should meet the requirement that the CFL number on the free surface is less than 1. When simulating the self-propulsion of a full-scale ship based on sliding mesh, the CFL number on the interface should also be less than 1. Additionally, to obtain the correct propeller excitation force, it was recommended that the time step size be maintained below 1°/step (0.000076 L PP /v).

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DES Prediction of Cavitation Erosion and Its Validation for a Ship Scale Propeller

Cited by 9 publications

References 1 publication

Simulating Cloud Cavitation Using Detached Eddy Simulation And Other Hybrid Turbulence Models

Simulating Cloud Cavitation Using Detached Eddy Simulation And Other Hybrid Turbulence Models

Cavitation erosion risk assessment on a full-scale steerable thruster

Simulation strategy of the full-scale ship resistance and propulsion performance

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