Ocean Wave Particulars - CAESAR II - Help

CAESAR II Users Guide

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CAESAR II
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CAESAR II Version
12

The Airy Wave Theory Implementation theory provides a good first approximation to the water particle behavior. The nonlinear theories provide a better description of particle motion, over a wider range depths and wave heights. Stokes 5tH Wave theory is based on a power series. This wave theory does not apply the symmetric free surface restriction. Additionally, the particle paths are no longer closed orbits, which mean there is a gradual drift of the fluid particles, that is, a mass transport.

Stokes 5tH Order Wave theory however, does not adequately address steeper waves over a complete range of depths. Dean’s Stream Function wave theory attempts to address this deficiency. This wave theory employs an iterative numerical technique to solve the stream function equation. The stream function describes not only the geometry of a two-dimensional flow, but also the components of the velocity vector at any point, and the flow rate between any two streamlines.

The most suitable wave theory is dependent on the wave height, the wave period, and the water depth. Based on these parameters, the applicable wave theory can be determined from the figure below (from API-RP2A, American Petroleum Institute - Recommended Practice 2A).