Authors: Irvine Jr., Martin; Longo, Joseph; Stern, Frederick

Source: Journal of Ship Research, Volume 52, Number 2, June 2008 , pp. 146-163(18)

Publisher: Society of Naval Architects and Marine Engineers (SNAME)

Abstract:

Towing-tank experiments of coupled pitch and heave motions are presented for a surface combatant advancing in regular head waves. The data include ballasting parameters, time histories, fast Fourier transform (FFT), Fourier series amplitudes, and pitch and heave transfer functions and phases for a range of speeds, wave steepnesses, and wave frequencies. The geometry is David Taylor Model Basin (DTMB) model 5512, which is a 1/46.6 scale geosim of DTMB model 5415 (DDG-51) with L_pp = 3.048 m. The experiments are performed in a 3.048 x 3.048 x 100 m towing tank equipped with a plunger-type wave maker. The test program is undertaken to provide a validation data set for unsteady Reynolds-averaged Navier-Stokes and other computational fluid dynamics (CFD) codes, including rigorous uncertainty assessment of the experimental results following standard procedures. Results indicate that the regular head waves are linear with second- and third-order magnitudes consistent with third-order Stokes waves. Pitch and heave responses and phases show expected trends for long and short wavelengths and are linear or Ak independent for all test conditions. Maximum response occurs for frequency of encounter equal to pitch and heave natural frequencies and L_pp / λ = 0.75. Under these conditions, an equation is derived that predicts the Froude number for maximum response as a function of ship geometrical coefficients.

Keywords: SHIP MOTIONS; HYDRODYNAMICS (GENERAL); RESEARCH

Document Type: Research article

Publication date: 2008-06-01

More about this publication?

• The Journal of Ship Research is a quarterly publication providing highly technical papers on applied research in hydrodynamics, propulsion, ship motions, structures, and vibrations. While the Journal requires that papers present the results of research that advances ship and ocean science and engineering, most contributions bear directly on other disciplines, such as civil and mechanical engineering, applied mathematics, and numerical analysis. High quality papers are contributed from the U.S., Canada and overseas, with representation from established authorities as well as new researchers.
• Information for Authors
• Submit a Paper
• Subscribe to this Title
• Membership Information
• ingentaconnect is not responsible for the content or availability of external websites

Related content

• In this: publication
• By this: publisher
• In this Subject: General & Civil Engineering ,  Hydraulic & Environmental Engineering ,  Mechanical Engineering
• By this author: Irvine Jr., Martin ;  Longo, Joseph ;  Stern, Frederick

Website © Publishing Technology. Article copyright remains with the publisher, society or author(s) as specified within the article.

• Terms and conditions
• Privacy policy
• Information for advertisers