bhushan taskar [[email protected]] supervisor: poul andersen · 11/44 dtu mechanical engineering,...
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Skibsteknisk Selskab 4 marts 20192/44 DTU Mechanical Engineering, Technical University of Denmark
Why Workbench?
Resistance Propulsion Engine Weather
Calm water resistanceAdded
resistance
Propeller designOpen water
curvesThrust
deductionWake fraction
MCR powerMax. rpmSea margin
Engine margin
Typical weather for a given route
Vessel Performance
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Skibsteknisk Selskab 4 marts 20193/44 DTU Mechanical Engineering, Technical University of Denmark
Performance in a Seaway
Route Simulations
Total Resistance
How? Creating a library of functions
Calm water Resistance
AddedResistance
Wind and other…
Weather RoutePropeller curves
Engine model
Voluntary speed loss
Fuel consumption
Emissions
Fouling
Ship motions
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Skibsteknisk Selskab 4 marts 20194/44 DTU Mechanical Engineering, Technical University of Denmark
What does it do?Simulates a ship on a particular route in a given weather
Ship Route Weather
Hull particularsL, B, T, CB, design speed,
wetted surface
Propeller designDia., no of blades, P/D,
blade area ratio
PropulsionThrust deduction, wake
fraction
EnginePower, rpm
Choose from available/
Define new route
User Defined/ Use weather data
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Available Routes
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Example Calculation
From Los Angeles to OsakaIn average weather of January
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Skibsteknisk Selskab 4 marts 20197/44 DTU Mechanical Engineering, Technical University of Denmark
Total Resistance
Ship Speed
Power
Propeller
RPS
Total distance = 4800 NMVoyage time = 13.6 daysFuel consumption = 2032 mt
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Skibsteknisk Selskab 4 marts 20198/44 DTU Mechanical Engineering, Technical University of Denmark
Simulations with Engine Model
Total Resistance
Ship Speed
Power
Propeller
RPS
Limited Power
Reduced speed
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Skibsteknisk Selskab 4 marts 20199/44 DTU Mechanical Engineering, Technical University of Denmark
Engine Limits
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Skibsteknisk Selskab 4 marts 201910/44 DTU Mechanical Engineering, Technical University of Denmark
Total Resistance
Ship Speed
Power
Propeller
RPS
Simulation options
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Skibsteknisk Selskab 4 marts 201911/44 DTU Mechanical Engineering, Technical University of Denmark
Available methods• Calm water resistance
– Holtrop, Hollenbach, Guldhammer methods– User specified resistance curve (CFD, Model tests, Potential flow, …)
• Propeller open water data– B-series propellers– User specified open water curves
• Added resistance– DTU and ITTC methods– User specified added resistance
• Default weather and routes– Weather: Monthly average of each month– Routes: busy shipping lanes
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Skibsteknisk Selskab 4 marts 201912/44 DTU Mechanical Engineering, Technical University of Denmark
Advantages• Easy to setup basic simulations
• Coded in Python – Open-source programing language– Increasingly popular– Many students at DTU learning Python
• Basic methods available for research/project
• Publish workbench module along with research > available to others
• Users can get access to new developments
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Skibsteknisk Selskab 4 marts 201913/44 DTU Mechanical Engineering, Technical University of Denmark
Research using Workbench• Effect of different added resistance formulations
• Added resistance only in head sea vs all wave conditions
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Skibsteknisk Selskab 4 marts 201914/44 DTU Mechanical Engineering, Technical University of Denmark
Other possible usages• Effect of energy saving devices
• Performance of ship with sails or Flettner rotors
• Effect of different routes – weather routing
• Different operating profiles – speed variations
• Calculate sea margin, engine margin
• Emissions and performance using different engine types
• Paint and fouling related studies