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

9th International Symposium on Cavitation

Ponkratov, Dmitriy^1

Technical Investigation Department, London, United Kingdom^1

关键词: Cargo ships;    Computational fluid dynamics simulations;    Computational mesh;    Eddy simulation;    Lloyd's registers;    Non-uniform wakes;    Numerical functions;    Underwater propellers;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/656/1/012055/pdf
DOI  :  10.1088/1742-6596/656/1/012055

来源: IOP

【 摘 要 】

Lloyd's Register Technical Investigation Department (LR TID) have developed numerical functions for the prediction of cavitation erosion aggressiveness within Computational Fluid Dynamics (CFD) simulations. These functions were previously validated for a model scale hydrofoil and ship scale rudder [1]. For the current study the functions were applied to a cargo ship's full scale propeller, on which the severe cavitation erosion was reported. The performed Detach Eddy Simulation (DES) required a fine computational mesh (approximately 22 million cells), together with a very small time step (2.0E-4 s). As the cavitation for this type of vessel is primarily caused by a highly non-uniform wake, the hull was also included in the simulation. The applied method under predicted the cavitation extent and did not fully resolve the tip vortex; however, the areas of cavitation collapse were captured successfully. Consequently, the developed functions showed a very good prediction of erosion areas, as confirmed by comparison with underwater propeller inspection results.