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DTU Mechanical Engineering, Technical University of Denmark
Ship Simulation WorkbenchDigital Twin for Vessel Performance
Bhushan Taskar
11 September 20202/20
DTU Mechanical Engineering, Technical University of Denmark
Background
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
11 September 20203/20
DTU Mechanical Engineering, Technical University of Denmark
Software for voyage simulation
•Ship Simulation Workbench– “Digital Twin” for vessel performance– Interactions between hull‐propeller‐engine‐weather
•Simulates a ship on a particular route in a given weather
11 September 20204/20
DTU Mechanical Engineering, Technical University of Denmark
Performance in a Seaway
Route Simulations
Total Resistance
Modular approach
Calm water Resistance
Added Resistance
Wind and other…
Weather RoutePropeller curves
Engine model
Voluntary speed loss
Fuel consumption
Emissions
Fouling
Ship motions
11 September 20205/20
DTU Mechanical Engineering, Technical University of Denmark
Inputs
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
Available Routes
11 September 20207/20
DTU Mechanical Engineering, Technical University of Denmark
Example Calculation
From Los Angeles to OsakaIn average weather of January
11 September 20208/20
DTU Mechanical Engineering, Technical University of Denmark
Total Resistance
Ship Speed
Power
Propeller
RPS
11 September 20209/20
DTU Mechanical Engineering, Technical University of Denmark
Total distance: 4800 nautical miles
Voyage time: 13.6 days
Fuel consumption: 2032 tonnes
KVLCC2 going from US to Japan in January weather
Total Resistance
PropellerRPS
Ship Speed
Power
11 September 202010/20
DTU Mechanical Engineering, Technical University of Denmark
Simulations with Engine Model
Total Resistance[kN]
Ship Speed[m/s]
Power[kW]
Propeller Speed[rps]
Limited Power
Reduced speed
11 September 202011/20
DTU Mechanical Engineering, Technical University of Denmark
Engine Limits
11 September 202012/20
DTU Mechanical Engineering, Technical University of Denmark
Workbench: methods
Calm water resistance• Guldhammer• Holtrop• Hollenbach• User specified
Added resistance• DTU method• STA‐wave2
Propeller curves• B‐series• User specified
Shallow water resistance• Lackenby• Raven
Wind resistance• ITTC Recommended (Fujiwara)
11 September 202013/20
DTU Mechanical Engineering, Technical University of Denmark
Ship sailing at certain speed
Total resistance
Required thrust
Open water curves
Propeller RPM
Delivered power
Fuel consumption
Torque
Weather:wind, wave, current
Voyage time
Added resistance
Calm water resistance
Thrust deduction
Wake fraction
Economy, Transport work
11 September 202014/20
DTU Mechanical Engineering, Technical University of Denmark
www.SSW.mek.dtu.dk
Download example files
Ship details
(Hull lines not required)
11 September 202015/20
DTU Mechanical Engineering, Technical University of Denmark
1. Guldhammer (easier)
2. Holtrop
3. Hollenbach
4. User specified
1. Calculate (easier)
2. Design
3. User specified
11 September 202016/20
DTU Mechanical Engineering, Technical University of Denmark
1. Monthly averaged weather (easier)
2. User specified weather conditions
Easier to simulate without engine limits
11 September 202017/20
DTU Mechanical Engineering, Technical University of Denmark
Research using workbench
•Effect of different added resistance formulations
•Propulsion factors in waves
•Speed reduction strategy
11 September 202018/20
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
![Tutorial on ANSYS WORKBENCH Simulation node - [email protected]](https://img.dokumen.tips/doc/110x75/6206255d8c2f7b173004dbb6/tutorial-on-ansys-workbench-simulation-node-emailprotected.jpg)
