Nonlinear Source Function Development

Abstract

LONG TERM GOALS. The major source function, nonlinear wave-wave interactions (Snl), in the operational wave model (WAM) are calculated by the discrete interaction approximation (DIA). They are inaccurate, especially in shallow water. Our long term goal is to develop an accurate and efficient Snl and thereby improve the WAM fundamentally. OBJECTIVE. The nonlinear source function (Snl) is highly nonlinearly distributed in frequency and direction; however, DIA is based on the piecewise assumption, which is incorrect. The exact-solution (5- dimensional integrations) by Hasselman and Hasselman (1981) is very time consuming and not practical. Resio and Tracy integrated Snl along the resonant orbits and reduced the 5-dimensional integrations to 3 dimensional integrations. Based on the fact that the Snl is highly nonlinearly distributed, we reduced 3-dimentional integrations (Resio and Tracy) to quasi-line integrations to minimize computational time.

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1999
Accession Number
ADA636668

Entities

People

  • Ray-qing Lin

Organizations

  • Naval Surface Warfare Center Carderock Division

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Electrical Solitons
  • Electronic Mail
  • Frequency
  • Information Operations
  • Mathematics
  • Military Research
  • Model Basins
  • Shallow Water
  • Ship Model Basins
  • Spectra
  • Surface Warfare
  • Three Dimensional
  • Water
  • Waves

Readers

  • Coastal Oceanography
  • Structural Dynamics.
  • Wave Propagation and Nonlinear Chaotic Dynamics.

Technology Areas

  • Space