Numerical Investigation of a Large Diameter Propeller Emergence Risk for a Vessel in Waves
Paper in proceedings, 2019

Although a Large Diameter Propeller (LDP) has a significant potential to improve a vessel propulsive efficiency, it may have a higher risk of propeller emergence and thus thrust reduction relative to a conventional propeller. The instantaneous propeller submergence can be considered as the main factor in the inception of the propeller emergence when the interaction between a running propeller and free-surface are disregarded. Therefore, accurate prediction of the ship motions and the hull wake in the vicinity of the propeller play a significant role in the propeller emergence risk assessment. In an earlier investigation, the authors of the current paper have carried out a comprehensive study on the seakeeping performance of the LDP vessel employing a Fully Non-linear Unsteady Potential Flow Panel Code in which a selected number of critical operating conditions with respect to the risk of propeller emergence have been identified. The objective of this paper is to further investigate the selected critical operating conditions by a higher fidelity approach which also takes the viscous effects into account. To this end, an Unsteady Reynolds-Averaged Navier-Stokes (URANS) solver is used for studying the seakeeping performance of the LDP vessel. The propeller is not modeled in the simulations. A good agreement is seen between the computed motions and resistance in regular head waves and the measurements data. Also, the results are compared to those from the potential flow simulations.

Ship Motions

Large Diameter Propeller

Potential Flow

Propeller Emergence

Reynolds-Averaged Navier-Stokes

Regular Head Waves.

Author

Mohsen Irannezhad

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Arash Eslamdoost

Chalmers, Mechanics and Maritime Sciences, Marine Technology

Rickard Bensow

Chalmers, Mechanics and Maritime Sciences, Marine Technology

8th International Conference on Computational Methods in Marine Engineering, MARINE 2019.
Gothenburg, Sweden,

Low Energy and Near to Zero Emissions Ships (LeanShips)

European Commission (Horizon 2020), 2015-05-01 -- 2019-04-30.

Driving Forces

Sustainable development

Areas of Advance

Transport

Energy

Infrastructure

C3SE (Chalmers Centre for Computational Science and Engineering)

Subject Categories

Vehicle Engineering

Fluid Mechanics and Acoustics

More information

Latest update

5/20/2019