BRODARSKI INSTITUT LtdMARINE RESEARCH & ADVANCED TECHNOLOGIES

SHIPHYDRODYNAMICSDIVISION

Zlatna Kuna, the most prestigious annual award of the Croatian Chamber of Commerce and Industry to the most successful Croatian companies forinnovation and excellence of products

1948-2008 | 60 YEARS

PAST AND FUTUREto become a leading research and development organisation in the field of applied sciences and technologies, integrated into the European network of related institutes

a member of the association of Europe’s specialised research and technology organisations EARTO

4 projects approved within the EU SeventhFramework Programme (FP7)Zlatna kuna award for innovation in two technological projects applied in industry

a beneficiary of the World Bank loan for the Science and Technology Project (STP) the ultimate goal of which is to support the restructuring of the selected Croatian research and development institutions

places its potentials at the disposal of theGovernment of the Republic of Croatia, and is still operating under its authority

three institutes from the Directorate of Naval and Technical Institutes united into a single institution – Brodarski Institut, Zagreb at the present location

operating within the Directorate of Naval andTechnical Institutes, the roof organization for Ship Hydrodynamics Institute, Naval Armament andEquipment Institute and Institut for Shipbuildingsituated at three different locations

operating within the Directorate for Naval andTechnical Research

the Institute was founded

2010

2008

2007

2005

1991

1967 - 1990

1959 - 1966

1956 - 1958

1948

ABOUTBRODARSKI INSTITUT

We have gained our sixty-year-experience in the area of deve-lopment and application of tech-nological knowledge by continuous updating of traditional knowledge and cognition. Following the latest technological trends we placed this knowledge on the market through nu-merous high-quality projects.

We have successfully passed the process of transformation from a military design and research institution to an institute for the transfer of new technologies, as we are today, thanks to the carefully planned stra-tegy that enabled us to establish a firm posi-tion on the market in two core segments: mari-time technologies and implementation oftechnological solutions in practice.

By carefully building confidence with our clients, we have earned excellent references in numerous multidisciplinary projects. Our competent experts who apply up-to-date scientific methods in various areas and carry out tests in our state-of-the-art lab-oratories as well as in the field have greatly contri-buted to this. In addition to the network of our clients and our wonderful green environment, our human re-sources represent our greatest assets.

We are proud of the participation of our prominent ex-perts in teaching activities and in projects at the institu-tions of higher education, universities and other scientific institutions. Moreover, distinguished scientists from techni-cal universities and related scientific institutions closely co-operate in the projects of Brodarski Institut.

On the following pages we present you a more detailed list of a wide range of our services and projects.

ABOUTSHIP HYDRODYNAMICS (SH)

The Ship Hydrodynamics (SH) is an advanced research establishment with state-of-the-art laboratories and testing facilities. SH is member of International Towing

Tank Conference (ITTC).

Scientists and engineers on staff at SH are involved in contract research and deve-lopment project and offer consulting services in shipbuilding, shipping, offshore tech-

nology, hydraulics and aerodynamics. Since its foundation, SH has constructed and tested more than 1300 ship models, build and tested almost 1150 propeller models

and conducted more than 1100 full-scale ship trials.

SH scientists and engineers have formidable depth and breadth experience.Their expertise includes design of different types of ships (full, large, wide, shallow draft, fine and high speed vessels, semi-displacement ships, planning crafts, catamarans, hy-

drofoils, submerged rotational bodies, fishing boats, tug boats, river boats, passenger ferry boats and all types of naval vessels and submarines), design of propulsors (fixed pitch,

controllable pitch, and surface piercing propellers), hydrodynamic testing and offshore engi-neering. About 30 percent of tested models were fast ships, navy and special purpose ships

designed for needs of police, coast guard and etc.

Lately, in hydrodynamic analysis CFD methods are applied. Established commercial CFD codes are validated on experimental data and are becoming indispensable part of the design

process.

The SH has an on-going in-house applied scientific research program and its scientists actively participate in technical meeting and conferences both at home and abroad.Furthermore, a close cooperation has been established with several Croatian faculties, especially

with the Faculty of Mechanical Engineering and Naval Architecture and the Faculty of Civil En-gineering in Zagreb, and the Technical Faculty in Rijeka.

A considerable number of SH scientist are members of these faculties. Similarly, several members of these faculties are involved in cooperative research projects with the SH.

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Testing FacilitiesSH is an advanced research establishment with state-of-the-art labo-ratories and testing facilities including:

Large Towing Tank High Speed Towing TankSmall Towing Tank Rotating Arm Tank Large Cavitation Tunnel Small Cavitation Tunnel Special Purpose Cavitation TunnelInstrumentation LaboratoryModel Manufacturing Shops

For some experiments the nearby lakes are also used. SH also has access to the testing facilities at the Institute for Civil Engineering and the Faculty of Civil Engineering, University of Zagreb.

SH Services and ActivitiesResistance and PropulsionPropellers and CavitationShip Dynamics(Manoeuvrability and Control, Seakeeping, Launching)Hydraulics MeasurementsMeasurements and InstrumentationNumerical Flow Calculations

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RESISTANCEAND PROPULSION

This group of activities comprises design and evalu-ation of optimum ship hull forms with superior fuel ef-ficiency performance. Designs are based on the results of both experimental and theoretical investigations. SH has developed several proprietary ship hull form series for: full ship,

shallow draft full ships, semi-displacement boats and streamlined submerged bodies.

SERVICES

SHIPBUILDING SHIP HYDRODYNAMICS

Resistance and Propulsion

Consultancy at any stage of ship designNumerical representation of ship geometryPreliminary prediction of performanceDesign and optimization of ship hull forms using standard series, proprietary SH series and statistical methodsResistance and propulsion tests forperformance evaluation of proposed designMeasurement of 3D wake to assist in design ofpropellers and shaft bracketsFlow studies to determine the optimum position of appendagesOptimization of hull forms on the basis of model testsTheoretical investigation of resistance componentsDevelopment of special purpose ships

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PROPULSORSAND CAVITATION

Propulsion and cavitation services are grouped into three main areas: experimental testing and measurement, design of propulsors and theo-retical investigations of propulsors and cavitation.ExpErimEntal tEsting and mEasurEmEnt of hydrodynamic ef-fects on ship parts and various structures exposed to flow are carried out in the large, small and special purpose cavitation tunnels are:

Propulsors and rudder models installed on ship hull models• (geometrically similar or dummy model)

Propeller models in non-homogeneous wake field•Resistance of propellers to erosion due to cavitation•Ship propeller models in oblique flow•Models of main and auxiliary propulsion and steering units•

(e.g. rotatable thrusters)Propeller induced pressures on a ship hull•Forces and moments acting on hydrodynamic•

profiles and foils in cavitating flowPropeller hydroacoustic properties•Pressures and flow velocities around road and rail vehicles•Resistance of materials to cavitation erosion•Erosion resistance of paint coatings in high velocity flow•

Propellers and Cavitation

dEsign of propulsors of various typEsDesign of conventional propellers, including propeller innonhomogenous velocity field on in oblique flowAnalysis and comparative evaluation of propulsor systemsfor purpose of selecting the most suitable propulsor configurationPrediction of propulsor inducted vibrationFeasibility studies of non-conventional propulsorsFeasibility studies of specific applications of conventional propulsors

thEorEtical invEstigations of propulsors and cavitationBasic research related to propulsion and development of experimentalinvestigations (e.g. development of systematic propeller series)Development of computational procedures for calculation of propulsor characteristicsStudy of wall effects on flow with cavitationEvaluation of current developments in propulsor technology

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SHIP DYNAMICS

Ship dynamics services are grouped into three main areas:manoeuvrability and control,seakeeping and launching.

SERVICES

SHIPBUILDING SHIP HYDRODYNAMICS

Ship Dynamics

manoEuvrability and control Consultancy at any stage of ship designTests with free floating surface or submerged ship modelsTestes with captive surface or submerged ship modelsEvaluation and assessment of ship model tests and theircorrelation with full-scale ship manoeuvring dataDesign of rudders and design of special stability control devicesPrediction of ship manoeuvres using computers modellingtechniques based on results of model tests and in-house accumulated dataDesign of ship hull forms, control surfaces and devices to meet requiredmanoeuvrability performance

sEaKEEpingComputer modelling of ship’s seakeeping parameters in early design stageModel tests in regular and irregular waves (maximum wave height 0.70 m)Performance prediction, identification of problem areas with related to ship motions(accelerations, slamming, shipping of green water, pressures, speed loss,propeller racing, seasickness, bending moments, etc.) measurements ofrelevant parameters and recommendations of solutionsDesign of ship hull forms with high percentage of operabilityand good ability to sustain speed in rough seas

launchingPreliminary studies and optimization of launchingLaunching tests of ship models and measurement of speed, accelerations,angles, vertical and horizontal trajectories, forces and bending moments during launchImprovements in launching techniques to obtain required degree of ship’s stabilitysafety and to minimize ship’s hull deformation during longitudinal or side launching

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HYDRAULICS MEASUREMENTS

In the area of hydraulic research feasibility studies, computer simulations, physical modelling and field investigations are conducted.

maritime Engineering services are directed towards offshore and ocean technologies (wind, waves, currents, bottom compo-sition, mooring facilities, breakwaters, harbours, sedimentation, wave power conversion…)

aerodynamic Engineering services are directed towards technical and ecological aspects of air dynamics such as steady flow observation, smoke and sedimentation studies, measurements of velocity, lift, drag and pressure of aerofoils, ships, cars, trains and other structures.

hydraulic Engineering services cover a wide range of hydraulic research related to complex hydraulic systems with large discharge, thermal influence on environment, pumps, valves and cavitation erosion tests on specimens for civil engineering.

Hydraulics Measurments

manoEuvrability and control Consultancy at any stage of ship designTests with free floating surface or submerged ship modelsTestes with captive surface or submerged ship modelsEvaluation and assessment of ship model tests and theircorrelation with full-scale ship manoeuvring dataDesign of rudders and design of special stability control devicesPrediction of ship manoeuvres using computers modellingtechniques based on results of model tests and in-house accumulated dataDesign of ship hull forms, control surfaces and devices to meet requiredmanoeuvrability performance

sEaKEEpingComputer modelling of ship’s seakeeping parameters in early design stageModel tests in regular and irregular waves (maximum wave height 0.70 m)Performance prediction, identification of problem areas with related to ship motions(accelerations, slamming, shipping of green water, pressures, speed loss,propeller racing, seasickness, bending moments, etc.) measurements ofrelevant parameters and recommendations of solutionsDesign of ship hull forms with high percentage of operabilityand good ability to sustain speed in rough seas

launchingPreliminary studies and optimization of launchingLaunching tests of ship models and measurement of speed, accelerations,angles, vertical and horizontal trajectories, forces and bending moments during launchImprovements in launching techniques to obtain required degree of ship’s stabilitysafety and to minimize ship’s hull deformation during longitudinal or side launching

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MEASUREMENTAND INSTRUMENTATION

Measurement and Instrumentation Group is responsible for:

Day to day operation of towing tanks,• carriages and cavitation tunnels

Maintenance of instrumentation,• measurement equipment and operation,

Maintenance of computers and peripherals•Development and calibration of special•

equipment, instruments, transducers and automatic testing systems

SHIPBUILDING SHIP HYDRODYNAMICS

Measurement and Instrumentation

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SHIP MODELMANUFACTURING SHOP

This facility is responsible for manufacturing of ship models and fabric-ation of other models for testing. Models are typically made from wood, fiberglass and foam. The shop is equipped with two special purpose ma-chines: milling machine for machining of ship models up to 10 m long and up to 1.4 m wide and a machine for measurement of ship geometry and positioning of its appendages. All models for testing in towing tanks, cavitation tunnels and wind tunnels are prepared and outfitted in this facility.

Ship Model Manufacturing Shop

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PROPELLER MODEL MANUFACTURING SHOP

In this facility the high precision propeller models, 2D and 3D hydro-foils, nozzles, rudders and appendages are manufactured. Up today al-

most 1150 propeller models of various types, made from brass and white metal, are manufactured.

SHIPBUILDING SHIP HYDRODYNAMICS

Propeller Model Manufacturing Shop

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NUMERICALFLOW CALCULATIONS

Numerical hydrodynamics is among new services of Brodarski Institut and it offers application of CFD methods to a wide range of flow prob-lems in the marine industry as well as in other fields.*

Fluid flow calculations are performed with up-to-date commercial softwares. The hardware and software capabilities of the department are following the rapid development of the computer technology. Ability of validation of the numerical re-sults on experimental data also contributes to the development in this area.

Level of provided flow details by CFD calculation is not reachable by application of other techniques. Furthermore, CFD can significantly accelerate design process and enables ex-aminations of possible variations of products which contributes in a great manner to the final design quality.

main fiElds of activitiEs arE: Flow around the ship hull Flow around appendages Wake predictions Propeller flow Aerodynamic flow

numericka.hidrodinamika@hrbi.hr

*for more information refer to the general broschure about the BrodarskiInstitut, marketing.prodaja@hrbi.hr

Numerical Flow Calculations

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FACILITIESTECHNICAL DATA

toWing tanKs largEtoWing tanK

high spEEdtoWing tanK

smalltoWing tanK

rotatingarm tanK

dimEnsions (m)

Length 276.3 302.5 44/67

Width 12.5 5.0 3.0

Depth 6.0 3.2 2.5 2.5

Diameter 32

Rotating arm length 12.0

Max model length 10 5 2 3

carriagE data

Speed range (m/s) 0.014 - 14 max 14 0.1-3.14

Max angular speed (1/s) 0.7

Max acceleration (m/s2) 1 1

Drive 8+2 EM 2 EM 1 EM 1 EM

Power (kW) 8 x 15.8/115or 2 x 2.5/12.3 2 x 37/110 1 x 2 1 x 2.94

Mass (t) 55 11 2.5

Computer controlled Yes Yes

WavE gEnErator

Type Double flap Flap Plunger

Drive EH EH EM

Power (kW) 2 x 55 30 22

Wave length (m) 1-40 max 10 max 7

Wave height (m) 0.08 - 0.7 max 0.25 max 0.35

Wave period range (Hz) 0.1 - 3.0 0.4 - 1.8 0.4 - 2.5

Computer controlled Yes

cavitation tunnElslargE

small spEcial purposEsection a section b*

Working sectiondimensions (m) 3.5 x 1 x 1 6.5 x 2 x 1 2.2 x 0.5 x 0.5 0.4 x 0.4 x 0.035

Propeller diameter (m) max 0.250

Ship model length (m) max 7

Max. water velocity (m/s) 11.3 5.5 8 30

Pressure range (bar) 0.1 - 2 0.1 - 2

Drive EM EM EM

Propeller EM power/rev 110 kW/3000 rpm 12 kW/3500 rpm

Impeller EM power/rev 220 kW/1450 rpm 24.4 kW/1450 rpm 75 kW/1455 rpmComputer controlled Yes Yes No

* With free surface14

croatian shipyards& shipping companiEs

Brodosplit - Split 3. maj - Rijeka BSO - Split Brodotrogir -Trogir Kraljevica - Kraljevica Punat - Krk Uljanik - Pula Tehnomont - Pula Greben - Vela Luka Tankerska plovidba - ZadarRapska plovidba – RabJadrolinija – RijekaMinistry of Defenceof the Republic of CroatiaMinistry of the Sea,Transport and Infrastructureof the Republic of Croatia

REFERENCES

BRODARSKI INSTITUT LTDMarine Research & Advanced Technologies

Avenija Većeslava Holjevca 2010020 Zagrebtel. ++385 1 650 41 00fax ++385 1 650 42 90brod@hrbi.hrwww.hrbi.hr

SHIP HYDRODINAMICS DIVISIONTel. ++385 1 650 41 62Fax ++385 1 650 42 30brodska.hidrodinamika@hrbi.hr

IMPRESSUM

Publisher: BRODARSKI INSTITUT, Zagreb, CroatiaFor the publisher Director of SHD: Željko Digaš, Nav. Arch. Editors: Gordana Semijalac, Nav. Arch., Miljenko Nikolić, Nav. Arch., Marta Pedišić Buča, M.Sc.Nav. Arch.Design: Produkcija_004, Zagreb Photographs: BRODARSKI INSTITUT archives

forEigncliEnts

Azimut, Benetti, Sydac, Pier LuigiAusonio Naval Architecture, GSETrieste, Fincantieri, TMT, Nuvolari-Lenard, Cantieri Navali Beconcini - ItalySeaway - Slovenia Rolls – Royce - SwedenMarinteknik – SingaporeHeavy Lift – NetherlandsBriand Yacht Design - FranceMarquis Yachts, Quantum - USAFapco – VenezuelaDubai Drydocks –UAENaviera Ulisses – Greece

www.hrbi.hr

The practical success of an idea, irrespective of its inherent merit, is dependent on the attitude of the contemporaries. If timely, it is quickly adopted; if not, it is apt to fare like a sprout lured out of the ground by warm sunshine, only to be injured and retarded in its growth by the succeeding frost.

Nikola Tesla