Ship Performance Predictions with Shipflow Motions summary
Multi-Fidelity simulations with Shipflow for Ship Performance Prediction (Conventional & Wind Assisted)
Aerodynamic hull forces:
- Coefficient based
- Computed with shipflow or from wind tunnel
Rudder forces
- Lifting line based model with viscous hull/ rudder/ propeller interactions precomputed with Shipflow
Apendage forces:
- Fins, skegs, bilge keels
- Modeller with boundary layer effects where necessary
Viscous hydrodynamics hull forces
- maneuvering derivatives based on prime or bis systems
- computed with Shipflow using virtual captive test approach
Free sailing, 6 DOF simulations with MOTIONS
- Compute free surface effects including incoming waves
- Include rudder and sail controls (PID)
- Solve equation of motion for dynamic equilibrium (balance between inertia forces and hydro and aero dynamic forces on the body)
Velocity Prediction Program (VPP) principles:
- Equilibrium assumption
- Predicts performance by balancing aero and hydrodynamic forces and moments acting on the ship
- Hydrodynamic and aerodynamic forces are modelled typically with regression formulas based on measurements, numerical simulations or simple models
Analysis features:
- Wind-assisted propulsion
- 6DOF
- Free-sailing
- Rudder controls (PID)
- Sail controls (PID
- Short-crested irregular waves
Analysis results:
- Power savings or Speed increase
- Calm sea and in Waves
- Steady or unsteady wind conditions
- Course keeping capabilities
- Manoeuvring capabilities
- Motions and accelerations
- Input for structural design
Ship Performance Predictions with Shipflow Usecase
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