Svašek Hydraulics

Coastal, harbour and river engineering consultants


JIP RoPES - Research on Passing Effects on Ships

New ports and terminals for LNG carriers, very large Container vessels and Crude Carriers are being designed and constructed. These new facilities have to be designed to provide safe mooring conditions, also when moored vessels are subjected to hydrodynamic effects (suction effects and draw down) due to passing vessels. In the past accidents have taken place which, in extreme cases, have resulted in loss of life, loss of the vessel and in a number of cases in severe damage to the mooring facilities. Existing design practice is often based on the use of simplified hydrodynamic models. Such methods are not able to take into account the site-specific conditions of a moored vessel and important physical effects are not being accounted for adequately. Predictions of mooring loads are often based on static instead of dynamic models. As a result, predictions of mooring loads and vessel motions can be severely flawed.

This study is intended to increase the understanding of important factors influencing passing vessel effects on moored vessels, taking into account site-specific factors. It will be aimed at the following:
  • increased insight in the physical factors influencing forces on moored vessels due to passing ship, the presence of current, etc.
  • increasing knowledge on the effects of choice of methodologies and tools for predicting motions and mooring loads of moored ships based on the passing vessel forces
Scope of work
  • evaluation of existing and new tools for the prediction of hydrodynamic forces and moored vessel responses
  • execution of model tests and computations taking into account, among others, a (complex) harbour geometry
  • full-scale measurements of mooring loads and moored vessel motions
Project deliverabels
  • recommendations with respect to the selection of adequate prediction methods for hydrodynamic forces on the moored vessel, taking into account specifics of the passing and moored ships and the physical characteristics of the mooring terminal
  • guidelines for the selection of the methodology for obtaining mooring loads and moored vessel motions resulting from the hydrodynamic forces on the moored vessel and the mooring system characteristics
  • a numerical tool for the prediction of the hydrodynamic forces on a moored vessel due to a passing vessel taking into account some of the most important site-specific physical characteristics of ships and terminal

Project organisation
The project will start in April 2010 and will be completed in 3 years.

The proposed work will be conducted as a Joint Industry Project (JIP) by:

  • Svašek Hydraulics
  • Pinkster Marine Hydrodynamics (PMH bv)
  • Deltares | Delft Hydraulics
Expressions of interest in the project are sollicited from such parties as:
  • operators of LNG, Container and Oil carriers as well as terminals
  • port authorities
  • regulatory bodies
  • terminal designers