# Study of Shallow Water Interaction Between Ships

Wold, Pal (1998) Study of Shallow Water Interaction Between Ships. MSc(R) thesis, University of Glasgow.

Full text available as:

## Abstract

When a ship operates in a harbour, in a channel or in confined waters, it usually does so close to other ships or some fixed structures. This is unavoidable because of the inherently restricted nature of these waters. The proximity of these other objects is potentially hazardous and it is important that the ship operator is able to maintain full control of the ship during operations in these waters. For this to be possible, the hydrodynamic interaction forces and moments, which are amplified in close encounters in restricted waters, should be properly understood. This thesis presents an investigation into the lateral forces and yaw moments experienced by a ship in transit near other ships. In the theoretical development, up to three ships are involved in the manoeuvre. For the conditions where two ships are interacting, new empirical formulae are derived for calculating the maximum lateral force and yaw moment coefficients. The first chapter presents an introduction and history of the ship-ship interaction problem, which has been investigated by other researchers. The second chapter is concerned with the problem formulation that the present method is based on. The interaction forces and moments acting on several ships are calculated using a numerical scheme based on the discrete vortex distribution method. In the third and fourth chapter, the lateral force and yaw moment coefficients are examined for the two ships interaction problem. The effect of varying several parameters (such as water depth, separation distance, ship size and ship speed) is analysed. Based on the parametric study, new empirical formulae are derived for calculating the maximum lateral force and yaw moment coefficients, both for the two ships meeting and two ships passing manoeuvre. Chapter 5 and 6 presents an investigation into the situations where three ships interacting. Again, effect of the water depth, separation distance, ship size and ship speed on the hydrodynamic forces and moments is examined, both for three ships meeting and three ships passing manoeuvre. In the last chapter the major findings and conclusions from the research are drawn. Recommendations for future work are made.

Item Type: Thesis (MSc(R)) Masters Adviser: K S Varyani Naval engineering 1998 Enlighten Team glathesis:1998-75380 Copyright of this thesis is held by the author. 19 Nov 2019 20:21 19 Nov 2019 20:21 https://theses.gla.ac.uk/id/eprint/75380