multiphysics needs in the naval marine industry john d ... arising from underwater explosions and...
TRANSCRIPT
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Industry Sector RTD Thematic Area Date Deliverable NrMarine and Offshore Multiphysics & Analysis Technology 13/11/01 N/A
Multiphysics needs in the naval marine industry
John D McVee & Dr A P Steer
QinetiQ Rosyth, Centre for Marine Technology, Dunfermline, United Kingdom
SummaryAn overview is given of possible multiphysics applications with reference to current QinetiQ research including that aimed at validated design and analysis capability for Trimaran warships. Examples are given of current capability with regard to the fluid structure interaction arising from underwater explosions and the hydroelasticity of ships in seaways.
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
QinetiQ TrimaranResearch
• Theoretical and experimental research- materials- hydrodynamics- structures- survivability- propulsion- signatures
• Aimed at validated numerical model design and analysis capability
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Multi-physics in the creation of high quality components
• Semi-levitation of titanium-aluminium alloys
• Involves- free surface flow- heat transfer- melting/solidification- electromagnetic fields
ALL COUPLED
Courtesy University of Greenwich
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Multi-physics in marine & offshore : welding in shipbuilding
Courtesy University of Greenwich
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Multi-physics in marine and offshore:
fluid structure interaction
FNB TRANSATFNB TRANSATCourtesy University of Greenwich
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Design Requirements and Flow Features• Range of flow features for CFD to
capture- Viscous flows- Inviscid wave flows- Time dependent flows
• Initial requirement for CFD is to capture viscous flow features- Resistance- Inflow conditions to propulsion- Ship/propeller interactions- Detailed flow characteristics- Lift and drag for manoeuvring
coefficients
© P&O Nedlloyd
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Propeller flow
• CFD can predict viscous flow
• includes separation• at full - scale
Blade pressure
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Fully Appended Ship
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
RV Triton
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Design considerations• Materials
- steels, castings, fibre reinforced plastics• Welding
- simulation of full and partial penetrations• Initial deformations
- vary as to methods of construction• Loading
- strip theory hydroelasticity- bow (and stern) slamming
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Design considerations• Ultimate strength
- undamaged and damaged- ship collision
• Fatigue life- rolling and corrosion tolerances
• Crack propagation- stress intensity factors
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Design considerations• Seakeeping• Propulsion
- Ship resistance• Noise & vibration
- structural bourne acoustics• UNDEX shock & whipping• Air-blast• Signatures
- radar cross section- target echo strength
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Finite element idealisation of RV Triton
•Length - 98m•Displacement - 1100 tonnes•D.O.F’s - 416000•Number of elements - 133625
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Finite element idealisation of RV Triton -truncated shock model
Fluid mesh
Centreline view of truncated shock model
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Exemplar of current capability
LOADS MAESTRO ADEQUACY PARAMETER
DSA
MSC/NASTRAN
THAFTS* RESPONSE PATRAN
SUBSTRUCTURE MSC/NASTRAN* Three dimensional Hydroelastic Analysis of Floating Travelling Structures
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Aim• Model federation• Interactive data exchange• Integrated multi-physics modelling capability
- fluid- structure- acoustic- thermal
• Begin with fluid-structure interaction- CFD/CSM fully interactive solutions- ship slamming, green sea deck loads
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FENET THEMATIC NETWORKCOMPETITIVE AND SUSTAINABLE GROWTH(GROWTH) PROGRAMME
Problem solving environment
• Model integration at multiple levels• Enables appropriate level of integration across many models• Takes account of
- strength of the interaction- state of the art in each field
• Commercial commodity software- iterative solution between software trials- cell based solution of coupled problems- e,g, PHYSICA