Page 14: of Maritime Reporter Magazine (December 2004)

Naval Architecture & Marine Engineering 5 minutes 10 minutes 20 minutes 30 minutes i | J

Continuous Flooding simulation in the time intervals (from left) 0 minute, 5 minutes, 10 minutes, 20 minutes and 30 minutes. The dark grey areas show damage openings.

Continuous Flooding Simulation

Due to a number of severe accidents involving RoRo ferries in recent years, there is an increased interest in model- ing continuous flooding within marine vessels. For many years, safety regula- tions have been prescriptive rather than being based upon individual vessels.

This is changing. Within procedures laid down by the IMO. there is an option for vessels to comply with regulations using numerical simulation. It is generally considered that numerical simulation will become the predominant method for the verification of ship safety.

Tribon M3 contains an application for

Continuous Flooding Simulation for modeling progressive flooding within a vessel. It is based on the numerical sim- ulation of the physical properties of flu- ids and the geometry of the individual vessel rather than a prescriptive approach. Fundamentally, it models two interconnected issues: the distribution of fluid within the compartments of the vessel and the attitude of the vessel to the water as time evolves.

To enable simulation to be carried out. it is first necessary to model the geome- try of the vessel. This includes designed openings between compartments in the hull, or those due to damage. There is no practical limitation on the number of compartments or the number of open- ings between connected compartments or even the number of openings con- necting any two compartments.

Once modeled, it is very simple to alter any opening or any initial distribu- tion of fluid in a vessel to simulate a range of scenarios. This facilitates the assessment of the severity of damage and the effectiveness of any counter measures taken to prevent sinking.

Counter measures may consist of clos- ing off certain openings or pumping water into or out of certain compart- ments in an attempt to balance the ves- sel. For this reason, water pumps are a feature of the modeling approach. This means that the simulation is useful for both design and operational training.

The software application has been written to make it easy to alter or refine the equations that model flow between compartments. For example, it is a straightforward matter to add the ability to model pumping into and out of com- partments and cross flooding through pipes. As the illustration shows, mathe- matical modeling has already produced a sophisticated functionality, particular- ly in the progression of water through the vessel. Furthermore, a number of research organisations, such as the Ship

Stability Research Centre (SSRC) at

Strathclyde University, are investigating sophisticated methods for modeling the ship dynamics.

The preceding was written by Alex

Drozdowicz, Senior Product Manager,

AVEVA.

New Marine Rated Circuit

Breaker

Bussmann Automotive Parts, a divi- sion of Cooper Industries, offers the

Series 187 marine rated circuit breaker.

The Series 187 MRCB is a Type 3 man- ual reset style circuit breaker with a switching function. Available in rates from 25A to 150A, it is available in panel mount or surface mount models.

Circle 2 on Reader Service Card

Barge Mounted Bunker

Blender

Jiskoot has supplied an in-line fuel oil blending system for use on a barge by

Astilleros de Murueta in Spain. The skid-mounted system will be mounted on the deck of a bunker barge, giving the client the flexibility to deliver bunker fuels across a wide range of viscosities.

Ship Design

Naval Architecture

Marine Engineering

Program Management Services

Systems Engineering

Environment Services

Combat Systems Engineering

An Employee Owned Company

Since 1957- Commercial and Naval Ship Design, Detail Design and

Construction Program Support, Marine Consulting,

Pollution Prevention Programs

Alexandria, VA Washington, DC * New York, NY » Newport News, VA j Pascagoula, MS s Pittsburgh, PA

Philadelphia, PA » Bath, ME >» Port Hueneme, CA J Atlantic Beach, FL j Harahan, LA

John J. McMullen Associates, Inc.

Corporate Headquarters 4300 King Street, Suite 400

Alexandria, VA 22302 (703)418-0100

Business Development Office

Phone: (703)933-6690

Fax: (703) 933-6777

Web Site: www.JJMA.com

Email: [email protected] from IF30 to IF460 as well as single products such as HFO. System control is by a Jiskoot InSight Blend Controller.

The blender continuously blends the component products according to the recipe set by the operator and produces a finished product of closely defined qual-

Circle 221 on Reader Service Card

NMEA Product Award

Winners - 2004

NMEA dealer members and the Certfied

Marine Electronics Technicians voted based on Quality, Ease of Use, Innovation, Product

Support from the Manufacturer, Reliability,

Customer Satisfaction, 0183 Compatability (where applicable) and Warranty. Below is a select list of the commercial category win- ners.

Autopilot (Commercial) Simrad AP50

Compass, Electronic Simrad RC36

Autopilot (Commercial) Simrad AP50

Compass, Electronic Simrad RC36

Electronic Cartography C-Map NT+

GPS/DGPS/WAAS Position Receiver Furuno GP37

Instrumentation Furuno RD30

Integrated Navigation System Furuno NavNet

Marine Antenna Digital Antenna 529-VW

Marine Specialty Product Digital Antenna DA4000

Navigation Plotter Furuno GP1900C

Navigation Software Nobeltec Visual Navigation Suite 7.0

Radar (Commercial) Furuno FAR 2107

Satellite Communications KVH Industries Tracphone 252

Shipboard Power Systems Newmar Phase

Three Battery Charger

Sonar Furuno CH250

SSB Radiotelephone ICOM M802

Stabilized TV Antenna KVH Industries TracVision 4

UAIS Furuno FA100

VHF Radiotelephone, Fixed ICOM M602

VHF Radiotelephone, Portable ICOM M88

Video Sounder/Fish finder (Commercial) Furuno FCV1100 14 Maritime Reporter & Engineering News