Workshop SMM 2008 - TRIMIS · VIRTUE@SMM 2008 - Workshop ˘ ˇˇ 10.00 The VIRTUE Project –...

6th Framework Programme"Sustainable development, global change and ecosystems"

VIRTUEProject No. 516201

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WorkshopSMM 200824 September 2008

A European Initiative to develop the Virtual Towing Tank

VIRTUE@SMM 2008 - Workshop

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10.00 The VIRTUE Project – Towards the numerical towing tank, J. Marzi,10.30 VIRTUE Workpackage 1: Enhancing the use of CFD in practical ship

design, H. Raven 11.00 Increase capabilities and efficiency of CFD tools to predict ship response

in waves - Added values of the Virtue Sea-keeping Tank, C. de Jouette11.30 Recent progress in the Virtual Manoeuvring Tank, S. Toxopeus, Q. Gao12.00 The Virtual Cavitaton Tank – Propeller performance and cavitation

predictions, T.v. Terwisga

12.30 – 14.00 Break

14.00 The Virtual Integration Platform – An approach towards a holistic hydrodynamic analysis, A. Duffy

14.30 Towards a CFD-based prediction of ship performance, A. van der Ploeg15.00 LES simulations for propellers with unsteady cavitation, R. Bensow15.30 RANS based Ship hullform Optimisations using the Virtual Integration

Platform, S. Gatchell16.00 End



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� Fast, efficient, reliable and safe maritime transportation systems and

� Sustainable, environment friendly operation

Both rely on the best possible hydrodynamic properties of the ships which provide the backbone of the transport chain.

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� The resistance and hence the power requirements and consequently also emissions



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� The resistance and hence the power requirements and consequently also emissions,

� Ship motion and stability at sea,



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� Ship motion and stability at sea, � Manoeuvring at sea and in particular in

confined waterways,



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� Ship motion and stability at sea, � Manoeuvring at sea and in particular in

confined waterways,� Propeller performance + cavitation.



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� Allows to assess all (hydrodynamic) effects on ship performance

� Analyse areas for improvements � And can hence be used to optimise

designs:



For a long time all kind of hydro-analysis was performed by model tests.Numerical modelling suffered from complex physics and insufficient accuracy.This lead to many tailor made solutions for “sub” problems.Even modern general purpose flow codes address marine problems with very particular approachesMany new Developments aim at use in Optimisation processes

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Improved accuracy;Integration of disparate tools;Integration of multi objective optimisation.

… and finally:

A large scale attempt to bundle resources on a European Scale to obtain solutions !



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20 Partners from 9 EU countries

Europe – according to VIRTUE

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WP1: Towing Tank

Resistance and PropulsionPredictions.



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The Virtual Towing Tank

x/LPP

z/L

PP

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Model scale.Green: RANSE, HSVARed: RANSE, MARINBlue: RANSE, ECN (solid BICS, dashed: GDS)black: measured, Ta=10.5,Tf=9.7mWavecut at centerline aft of the transom

AP



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WP1: Towing Tank

Seakeeping, Stabilityand SlammingPredictions.

WP2: Seakeeping Tank



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� The numerical wave tank

� Ship Motion and Loads

� Validation (model tests)



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WP1: Towing Tank

WP2: Seakeeping

TankManoeuvring PredictionsCoefficients and directSimulation.

WP3: Manoeuvring Tank



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2. Direct manoeuvring simulationDevelopment of full RANS simulation capability

Manoeuvring Simulation 2 Approaches:1. Hydrodynamic coefficients



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WP1: Towing Tank

WP2: Seakeeping

Tank


Propeller and CavitationPredictions.

WP4: CavitationTank



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Develop RANSE codes for (non/) cavitating Propulsor flow predictions

Multiphase LES code Open Foam - Developments and Validation by Chalmers University

Evaluation + benchmark studies:• Flow mechanisms (Delft foil)• Propeller test case (INSEAN propeller)• Hull Propeller Interaction



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WP1: Towing Tank

WP2: Seakeeping

Tank


WP4: Cavitation Tank



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WP1: Towing Tank

WP2: Seakeeping

Tank



WP 5IntegrationPlatform

� Integrate currently disparate tools � Provide data management based on

specific user requirements� Provide multi-criteria optimisation� Provide new visualisation



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� Assembling the building blocksWP1: Towing Tank

WP2: Seakeeping

Tank

WP 5Integration



System User(s)• internal • via web portals

� A flexible Integration platform has been developed as basis for a holistic hydrodynamic analysis;

� Tools are integrated via wrappers;� Today: Sequential processes + first optimisations � Tomorrow: Full multi-objective optimisation

Process in the VIP



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� Propulsion Prediction:Propeller thrust und torque

Tools to be used: CFD Codes + CAD + Visualisation



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T = 131.7 kN

CAD

<- WP 1 CFD WP 4 ->

Visualisation



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WP1: Towing Tank

WP2: Seakeeping

Tank



WP 5Integration

System User(s)• internal • via web portals



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� What are the drivers for our developments?

� What can CFD do to help?

… global shipping operations are responsible for emitting

1.2 billion tonnes of CO2, equivalent to 4.5% of worldwide emissions …

Sulphur is the next big thing …



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Hydrodynamic / Form optimisation yields improved results

Added benefits in terms of power requirements and cost,and emissions -> environmental aspects



The Virtual Towing Tank

� Minimal resistance at a given speed.

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� Lowest possible power required.� Lowest fuel consumption.� Minimised Operational cost.

� Minimised environmental effects.



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Numerical analysis of ship resistance

The VIP

Generate a response surface

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240.0

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Rt [kN]

Rr [kN]Rt [kN]

… and the VIP allows to include more objective functions(propulsion, seakeeping, …)



• VIRTUE has delivered significant advances in terms of accuracy of CFD predictions in all areas addressed.

• This is a prerequisite for the application of CFD methods in automatic optimisations.

• VIRTUE will deliver a set of “Best Practice Guidelines” from all WPs.

• The VIP has been successfully applied to several applications and offers a large potential for future exploitation.

• The project partners aim at further developing and establishing this as a general CFD analysis platform.

• The “Virtual Towing Tank” will not come as a “Black box”.

VIRTUE has delivered significant advances in terms of accuracy of CFD predictions in all areas addressed.This is a prerequisite for the application of CFD methods in automatic optimisations. VIRTUE will deliver a set of “Best Practice Guidelines” from all WPs.The VIP has been successfully applied to several applications and offers a large potential for future exploitation. The project partners aim at further developing and establishing this as a general CFD analysis platform.The “Virtual Towing Tank” will not come as a “Black box”.

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Workshop SMM 2008 - TRIMIS · VIRTUE@SMM 2008 - Workshop ˘ ˇˇ 10.00 The VIRTUE Project –...

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Transcript of Workshop SMM 2008 - TRIMIS · VIRTUE@SMM 2008 - Workshop ˘ ˇˇ 10.00 The VIRTUE Project –...