Model-scale measurements and full-scale sea trials were compared to numerical simulations of different ship maneuvers. Simulations were performed using codes that solve the Reynolds-Averaged Navier-Stokes (RANS) equations coupled with the nonlinear rigid body equations of motion. Different time scales existing between ship motions and fluid flow as well as diverging spatial discretizations of hull and propulsor in conjunction with the propulsor's rotation increased the required computational efforts, rendering the model unsuitable for comprehensive parametric investigations. To overcome these difficulties, a mixture between mesh morphing for small-scale motions and global displacement of the mesh for large-scale motions was developed. Previous investigations mostly replicated captive model tests or resolved the viscous flow more precisely to explore various dedicated effects. RANS simulations offer valuable insight into scale effects involved in maneuvering prediction as they allow the study of both ship and model scale flows. This paper explores the reliability of both direct maneuvering simulation (using a combination of a freely moving ship including the rotating propulsor) and simulations based upon the virtual replication of captive model tests (using Taylor-series expansions to model the external hydrodynamic forces). The influence of engine-propulsor interaction in maneuvering motion behavior and scale effects is discussed. Predictions are compared to model tests and sea trials.
RANS-Based Simulated Ship Maneuvering Accounting for Hull-Propulsor-Engine Interaction
Ship Technology Research / Schiffstechnik ; 61 , 3 ; 142-161
2014
20 Seiten, Bilder, Tabellen, Quellen
Article (Journal)
English
RANS-Based Simulated Ship Maneuvering Accounting for Hull-Propulsor-Engine Interaction
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