SAFEDOR – the implementation of risk-based ship design and approval

The integrated project SAFEDOR has been completed in spring 2009 and this paper summarizes the achievements. SAFEDOR has been focusing work on the development of a risk-based regulatory framework, a risk-based design framework, advanced probabilistic simulation tools and their integration as well as a series of application examples. The paper outlines the elements of the risk-based regulatory framework incl. approval process, risk evaluation criteria, requirements for documentation and key personnel as well as onboard documentation. Novel risk-based simulation tools and their integration into a design environment are discussed. The paper also highlights the innovative ship designs developed within SAFEDOR and points towards possible future applications. Eventually, future research on risk-based approaches is outlined

Prediction of green water loads for a RoRo passenger ferry

ABSTRACT Selected results of the European research project DEXTREMEL are presented with emphasis on green water loads on the forward bulkhead of the superstructure of a RoRo passenger ferry. The finite volume code COMET was used to predict these loads. Model tests were carried out in a seakeeping basin. Experimental measurements comprised wave heights along the deck contour and local pressures at the forward bulkhead. In addition, a laser-based measurement technique visualized green water contours on the deck. Effects of boundary conditions and initial conditions were studied for simulation of flow over the deck. Predicted wave heights and impact pressures were compared with measurements. It is shown that some features of the complex flow over the deck can be predicted and that resulting impact pressures are in fair agreement with measurements. INTRODUCTION A ship operating in severe seas may be subject to shipping of green water, which can result in extreme loads on deck and deck structures including the superstructure. The term "Green Water" describes the situation when wave heights exceed freeboard and water starts to flow over the deck