Racing propeller in waves has long been a research hot topic but still lacks research achievements due to high difficulties both in numerical simulation and experiment. Thus more in-depth investigations are required especially those based on new numerical method, including accurate simulation of the drastic deformation of the free surface such as plunging and breaking, and accurate prediction of the serious fluctuation and deterioration of its hydrodynamic performance partially caused by the free-surface deformation. Previous numerical studies upon propeller performance in waves have focused on the fully-submerged conditions, where usually the Reynolds-Averaged Navier-Stokes (RANS) models are used to simulate the inconspicuous free surface deformation. Considering marginal air bubbles and gas-liquid mixing phenomenon around the racing propeller, instead of RANS, Large Eddy Simulation (LES) together with overset mesh method and Volume of Fluid (VOF) method is adopted in this paper for investigating the hydrodynamic performance of a racing open water propeller in regular head waves. The numerical simulation has been performed under variant submergence depths and advance coefficients, and the deformation of the free surface and its relation to propeller thrust and torque are discussed. The results of numerical simulation are validated by corresponding experiments conducted in the Circulating Water Channel Laboratory of Shanghai Jiao Tong University. The numerical errors against experimental results of time-averaged and transient thrust and torque based on LES model are reasonable and acceptable, which implies that the LES model used in this paper is suitable in dealing with propeller performance in racing conditions. As conclusions, the deterioration of time-averaged thrust and torque of racing open water propeller in regular head waves is more serious when the advance coefficient is relatively low. The fluctuation amplitude of thrust and torque time-series decreases as submergence depth increases.
CFD Simulation of Racing Open Water Propeller’s Hydrodynamic Performance in Regular Head Waves Based on Large Eddy Simulation
Lecture Notes in Civil Engineering
Practical Design of Ships and Other Floating Structures ; 2019 ; Yokohama, Japan September 22, 2019 - September 26, 2019
2020-10-06
16 pages
Article/Chapter (Book)
Electronic Resource
English
Simulation of Racing Chassis Performance Based on ADAMS
ASCE | 2018
|Characteristics of High-Speed Propeller's Foils in the Pseudo-Supercavitating Region
SAE Technical Papers | 1989
|Very-Large-Eddy Simulation Based on
Online Contents | 2015
|