CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers

Pablo M CARRICA; Hamid SADAT-HOSSEINI; Frederick STERN

doi:10.1016/j.compfluid.2011.10.002

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CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers

Journal article

Peer reviewed

CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers

Pablo M CARRICA, Hamid SADAT-HOSSEINI and Frederick STERN

Computers & fluids, Vol.53(1), pp.117-132

2012

DOI: 10.1016/j.compfluid.2011.10.002

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Abstract

The mechanisms of broaching in following regular waves are studied by analysis of free model computations. Simulations of the fully appended ONR Tumblehome model DTMB 5613 are performed with the ship hydrodynamics code CFDShip-Iowa v4.5 and validated against experiments of an auto-piloted, self propelled model ship. Appendages include bilge keels, skeg, shafts and struts, moving rudders to control heading, and rotating propellers for self-propulsion. Proportional and proportional–integral autopilots are used. Once validated against experimental data for the proportional controller, the flow field and forces and moments on the hull and individual appendages are analyzed in detail to identify the mechanisms leading to the broaching event. It was found that several reasons contribute to the inability of the ship to overcome the hydrostatic yaw moment caused by the approaching wave. However, it is shown that the use of a slightly better autopilot prevents broaching under identical operating conditions, presenting an opportunity to extend the safe operating envelope of the ship.

Fluid Dynamics

Applied Sciences

Physics

Computational methods in fluid dynamics

Fundamental areas of phenomenology (including applications)

Exact sciences and technology

Ground, air and sea transportation, marine construction

Marine construction

Details

Title: Subtitle: CFD analysis of broaching for a model surface combatant with explicit simulation of moving rudders and rotating propellers
Creators: Pablo M CARRICA - IIHR ― Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, United States
Hamid SADAT-HOSSEINI - IIHR ― Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, United States
Frederick STERN - IIHR ― Hydroscience & Engineering, The University of Iowa, Iowa City, IA 52242, United States
Resource Type: Journal article
Publication Details: Computers & fluids, Vol.53(1), pp.117-132
Publisher: Elsevier; Kidlington
DOI: 10.1016/j.compfluid.2011.10.002
ISSN: 0045-7930
eISSN: 1879-0747
Language: English
Date published: 2012
Academic Unit: IIHR--Hydroscience and Engineering; Mechanical Engineering
Record Identifier: 9984064578602771

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