PREDICTIVE METHODS

Thanks to the progress made in computational fluid dynamics, the hydrodynamic performances of most naval platforms can now be simulated.

The expertise of SIREHNA’s engineers makes them able to fully exploit the potential of these methods.

Qualified and industrialized methods are used to predict the performances of various marine systems, such as ships, submarines, propellers, tidal turbines. SIREHNA also prepares and validates new methods and tools to answer more complex problems.

- Digital simulation experiments designed to validate concepts of development, & evaluate the hydrodynamic performance -

Watch the video SHIP PERFORMANCE HYDRODYNAMICS

NUMERICAL TOWING TANK

FAST & RELIABLE TOOLS FOR SHIP DESIGN VALIDATION AND OPTIMIZATION

Boat de face blueREV

Ship Resistance

  • Resistance in calm water
  • Added resistance in waves
  • Hull form and appendages optimization
  • Self propulsion
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Seakeeping

  • Standard seakeeping assessment
  • Nonlinear motions and added resistance in reg.waves (CFD)
  • Passive roll stabilisation tanks design
  • Active roll stabilisation: fins, rudder roll
  • Sea State Estimator & Best route prediction
hydro acoustic bleu NG 2

Hydro Acoustic

  • Hydrodynamic modelling for acoustic purpose, propeller induced noise
  • Propeller unsteady flow behind hull
  • Boundary layer calculation
  • Advanced CFD models for turbulence prediction (LES…)
wave bleu NG

Wakes & water waves

  • Near field ship wake (vortices)
  • Far field ship wakes (waves, vortices, turbulence)
  • Influence of turbulence on structures diffusion
  • Interaction of immersed body with surface waves (detection)
autopilot2

Manoeuvrability

  • CFD ship manoeuvrability (tactical diameter, zigzag)
  • Stability
  • CFD manoeuvrability of underwater vehicles

 

Cavitation bubble

Cavitation

  • Open water cavitation
  • Tip vortex cavitation
  • Cavitation in ship wake
  • Ventilation
aerodynamic bleu NG

Aerodynamics

  • Hull optimization
  • Aerology
  • Exhausts and pollutants trajectory
  • Superstructure resistance

SIREHNA PROPELLER VENTILATION OPTIMIZATION Watch the video PROPELLER OPTIMIZATION VENTILATION

PROPELLER DESIGN

SIREHNA's expertise allow us to design & optimize any type of propeller and thruster (conventional, ducted, contra-rotative, pre-swirl stator, cap fins, vertical axis, energy saving devices, pump jet….) including propulsive performances and efficiency, cavitation, pressure pulses, radiated noise.

open propeller

Open propeller

ducted propeller

Ducted propeller

contra rotating

Contra rotating

pre swirl

Pre-swirl

propeller pump jet

Pump jet

cap fins

Cap fins

trochoidal propeller

Vertical axis

Focus on performance prediction

  • Open water performances prediction: thrust, torque, efficiency
  • Open water analysis and behind hull (surface ship, submarine, UUV, …)
  • Extension to four quadrants: any combination of rotation speed and advance velocity, including crash stop conditions
  • All types of thrusters and energy saving devices
  • Cavitation inception and extension computation in open water and behind hull
  • Extension to ventilation