Prerequisites

The tutorial presents a simple case study with the purpose of demonstrating functionality in AquaSim. It is assumed that the user is familiar with the basic principles of modelling and specifying material parameters in AquaEdit, as well as conducting analyses. If you are looking for an introduction to AquaSim we advise you to start with the Basic program tutorials.

Introduction

This tutorial describes how wave loads on impermeable net, such as lice skirts, are defined and analysed in AquaSim. Focus is on the “Wave excitation load”-part of the load interface found in AquaEdit. Particular attention is paid to the “Flexible tarp” load formulation and how it can be combined with numerical diffraction in the hybrid load model. The purpose is to provide a step-by-step introduction to the formulation, its theoretical basis, and its practical implementation in AquaSim.

Fundamental principles are presented first, including Froude-Kriloff pressure and wave particle kinematics, and how these are applied to flexible impermeable nets. Example analyses are presented to illustrate the approach, followed by comparisons with analytical solutions and physical model test data.

The overall aim is to give the user an understanding of how lice skirts, and similar impermeable nets, respond to waves and currents, and how AquaSim’s hybrid load model can be applied.