Prediction of Viscous Ship Roll Damping by Unsteady Navier-Stokes Techniques

[+] Author and Article Information
R. A. Korpus

Science Applications International Corporation, 134 Holiday Court, Suite 318, Annapolis, MD 21403

J. M. Falzarano

Department of Naval Architecture, University of New Orleans, New Orleans, LA 70148

J. Offshore Mech. Arct. Eng 119(2), 108-113 (May 01, 1997) (6 pages) doi:10.1115/1.2829050 History: Received September 01, 1996; Revised November 11, 1996; Online December 17, 2007


This paper describes a numerical technique for analyzing the viscous unsteady flow around oscillating ship hulls. The technique is based on a general Reynolds-averaged Navier-Stokes (RANS) capability, and is intended to generate viscous roll moment data for the incorporation of real-flow effects into potential flow ship motions programs. The approach utilizes the finite analytic technique for discretizing the unsteady RANS equations, and a variety of advanced turbulence models for closure. The calculations presented herein focus on viscous and vortical effects without free-surface, and utilize k-epsilon turbulence modeling. Series variations are presented to study the effects of frequency, amplitude, Reynolds number, and the presence of bilge keels. Moment component breakdown studies are performed in each case to isolate the effects of viscosity, vorticity, and potential flow pressures.

Copyright © 1997 by The American Society of Mechanical Engineers
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