A semi-empirical multi-degree of freedom body force propeller model

OCEAN ENGINEERING

卷:178

Article

Knight, Bradford G.¹  Maki, Kevin J.¹ 

[1] Univ Michigan, Dept Naval Architecture & Marine Engn, 2600 Draper Dr, Ann Arbor, MI 48109 USA

关键词: Propeller;    CFD;    Body force model;    Semi-empirical algorithm;   

DOI  :  10.1016/j.oceaneng.2019.02.056

来源: Elsevier

【 摘 要 】

Efficient and accurate modelling of a self-propelled vessel in a large amplitude seaway with CFD-based numerical methods is a challenging task and is prohibitively expensive for most designers and engineers. Viscous CFD methods can accurately model viscous effects, but the small numerical time step required to analyze the rotating propeller leads to a large computational cost. A method for efficiently and accurately modelling the six degree of freedom force on the propeller is required to feasibly model a self propelled vessel maneuvering in a high amplitude seaway. This paper outlines the framework for developing an unsteady body force propeller model for unsteady conditions. The purpose of this study is to train a semi-empirical algorithm to accurately prescribe the unsteady body force to model the propeller. The MOERI Container ship propeller is analyzed with RANS CFD. Open water data is compared to the BANS CFD results of a steady Moving Reference Frame approach. Unsteady surge and propeller revolution rate are applied to a transient rotating mesh model in open water and behind condition. The predictions of the algorithm match well with the CFD results.

【 授权许可】

Free