Numerical Modelling of 3D Oblique Waves by L-type Multiple Directional Wave Generator

Abstract

The improvements on the oblique planar wave train in a basin generated by multiple irregular wave generators are investigated numerically in this study. Though oblique waves of any desired incident angle can be generated by serpentiform wave generators as they were settled in a single line, the generations of waves are limited in specific areas in the basin, which the effective experiment area with uniform wave field is narrow; therefore, most landforms and/or model are located too close to the wave generators. In this study, numerical simulations of desired oblique waves are generating separately but simultaneously by the two series of serpent type wave generators set in L-shape to enlarge the effective experiment area. Based on the Lagrangian description with time-marching procedure, a threedimensional multiple directional wave basin was developed to simulate ocean waves by using the BEM with quadrilateral elements. The simulations of perpendicular waves are executed in the first instance to verify the scheme, and proceed with the generations and propagations of oblique waves in larger angle. Accordingly, the comparison of waveforms variation confirms the estimation of oblique waves a feasible scheme.