VIVIANI , Michele

Use of electronic control onboard to handle complex and powerful propulsion systems has constantly increased; this, in turn, may influence ship behaviour during manoeuvres. As it is well known during manoeuvre of a twin-propeller vessel, like turning circle or zig-zag manoeuvres, significant unbalances on the shaft lines, in terms of torque and...

Nato publication (Standardisation agreement) on ship manoeuvrability resulting from work of the NATO ST-SM (Specialist Team –Seaway Mobility)

Nato publication on ship manoeuvrability resulting from work in the NATO ST-NSM (Specialist Team Naval Ship Manoeuvrability)

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NATO publication on ship manoeuvrability resulting from work of NATO ST-NSM (Specialist Team Naval Ship Manoeuvrability)

Design and optimization of the propulsion system is a crucial task of the ship design. In fact the behaviour of the propulsion system is a key aspect of the global behaviour of a ship, mainly if the ship is a naval vessel. Simulation techniques can be very effective to predict the propulsion plant behaviour during normal working conditions as...

This work presents the main steps for the development of a multi-physic simulation platform, able to represent the dynamics of a twin screw ship in six degrees of freedom, taking into account the complete propulsion system including automation effects. The simulation platform has to be used in the preliminary design phase in order to study and...

Conferenza Atena, Settembre 2007, Fiesso d'Artico

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A comprehensive approach to modelling and simulation of high speed craft dynamics during turning circle and zig-zag manoeuvres is presented in this paper. The high performance requirements for propulsion systems and the increasing attention being paid to planing hull manoeuvring features suggest the need for a thorough investigation into ship...

A comprehensive approach to model and simulate high speed craft dynamics during turning circles and zig-zag manoeuvres is presented in this paper. The high performance requirements for propulsion systems and the increasing attention on manoeuvring features suggest the need for a thorough investigation about planing hull dynamics, already in the...

THE PRESENT WORK ADDRESSES THE ASYMMETRICAL FUNCTIONING OF RUDDER/PROPEL LER COMPLEX OF TWIN SCREW/TWIN RUDDERS SHIPS. A SERIES OF FREE RUNNING MODEL TEST RESULTS ARE ANALYSED, WITH THE AID OF SOME SIMPLIFIED NUMERICAL CALCULATIONS. THIS ANALYSIS ALLOWS TO SHOW THE ASYMMETRICAL PROPEL LER LOADING DURING MANOEUVRES AND THE CONSIDERABLY DI...

The continuous development of design tools and analysis procedures has allowed propeller performances to increase progressively during years following more and more stringent design requirements . High propeller efficiency and avoidance of erosive cavitation are considered nowadays basic requests for a well designed propeller. However this may...

A free surface Reynolds-averaged Navier–Stokes solver and a smoothed particle hydrodynamics method, the latter currently under development by the authors, have been applied to the evaluation of slamming loads (global forces and local pressures) over a series of two-dimensional cases for which experimental data (drop tests with a free falling...

This work deals with the application of different numerical methods for the evaluation of slamming loads on V-shape sections, namely a commercial CFD VOF program and Smoothed Particles Hydrodynamics Method (SPH) currently under development at DINAV; preliminary results from both methods are presented, together with a comparison between the two...

The propeller performances and in particular the non-stationary cavitating behavior and its side effects, i.e. pressure pulses and radiated noise, are strongly dependent on the ship wake field. Many different predictive methods are available, however in many cases predictions are still performed on the basis of semi-empirical approaches, whose...