Accession Number:

ADA495942

Title:

Potential Flow Forces and Moments from Selected Ship Flow Codes in a Set of Numerical Experiments. Appendix I - Time History Plots for 2-DOF Wave Contouring Motion of Model 5613

Descriptive Note:

NSWCCD-50-TR-2008-040-APP-I

Corporate Author:

NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD

Personal Author(s):

Report Date:

2008-05-01

Pagination or Media Count:

243.0

Abstract:

This appendix contains all plots and tables for simulations of task 3 involving 2-DOF nominal wave contouring of Model 5613 scaled to the length 154 m. It presents results for wave contouring in both beam and following seas. In either case the vertical position of the center of gravity is always at the water surface. For condition 1, where the ship undergoes prescribed heave and pitch motions in regular following seas, the wavelength and wave steepness are given by equations lambdaL 2 and Hlambda 120. Longitudinal slope of the hull matches the slope of waves at CG. For condition 2, where the ship undergoes prescribed heave and roll motions in regular beam seas, the wavelength and wave steepness are given by equations lambdaL 1 and Hlambda 110. Here transverse slope of the hull matches the slope of the waves at CG. Results for Froude numbers 0.0 and 0.3 are included. Each of Figures I-1 through I-102 contains time-history plots of results from all codes for each variable during one period of motion. If the code runner did not supply the data, the data vanish identically, or the data are insufficient for a single period, there is no curve for that code. As necessary, time that appears on the horizontal axis has been shifted so that heave displacement equal to the wave height at CG is of the form eta etaa sin omega t for some amplitude etaa and some amplitude omega. Further, time t has been replaced by t mod Te where Te is period of motion. For beam seas, data from AEGIR were modified before plotting so that results correspond to waves coming from starboard side of the hull. Tables I-1 through I-204 contain information related to the results found in the figures. Minimum and maximum of both filtered and unfiltered variable are provided although the plot itself was obtained from unfiltered data.

Subject Categories:

  • Numerical Mathematics
  • Computer Programming and Software
  • Marine Engineering
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE