A34. propagation along a wave guide


The purpose of this test is to verify whether waves propagating along a wave guide are indeed trapped. The wave guide consists of a straight shallow through a deeper area. The axis of the shallow area is in N-S direction.
At the Southern boundary an incident wave field is assumed which propagates from the Southern boundary in N direction. The peak period is 10 s.
In the analytical solution the amplitude along the axis is constant. Computed values for Hs along the axis are compared with the analytical results.

4 cases are considered:

A34a
Swan without diffraction with standard grid orientation
A34b
Computation with diffraction on a standard grid, with enhanced smoothing
A34c
Computation with diffraction on a standard grid, with moderate smoothing
A34d
Computation with diffraction on a standard grid without smoothing

It is seen that the solutions, both with and without diffraction, show considerable error. Apparently the model loses wave energy to the sides.

© 2012: Nico Booij