Hydrodynamics
Specialized in ship hydrodynamics we analyse the behaviour of ships in waves and currents, performing:
- Seakeeping analysis providing the motions of the floating structure
- Wave loads analysis
- Computational Fluid Dynamics (CFD) for turbulent flows
- Marine operation such as towing
Our analysis are performed :
- In regular waves in the Frequency domain by means of diffraction radiation
- In irregular waves
- By Spectral analysis allowing statistic calculations in irregular waves
- In Time domain
Seakeeping and wave load analysis are using Diffraction Radiation program such as HYDROSTAR from the BUREAU VERITAS. The Navier Stokes equations are solved by a source/sink methodology called Boundary Element Model (BEM) providing the solution of fluid velocity potentials at the center of modeled surface panels. The Vessel hull is modeled with 3D panels and set in its floating position (draft and trim) taking in account its mass characteristics (gravity centers and radii of gyration).
Following input are computed:
- Vessel geometry, mass characteristics and gravity centers
- Vessel floating position
- Vessel speed and direction
- Water depth and water density
- Wave periods and Headings
- Vessel Internal tanks
Following results and data can be extracted and monitored:
- Added-mass and wave-making damping matrix of the vessel
- Wave first order loads applied to the vessel and linear with the wave height
- Responses of the floating bodies: Motion, velocity and accelerations at various points of interest and in the 6 degrees of freedom (Surge, Sway, Heave, Roll, Pitch and Yaw)
- Wave second order loads also called drift loads: Second-order low-frequency loads proportional to the square of the wave height
- Fluid pressure distribution on ship hull
- Wave bending moment and wave shear forces
- Wave fields around bodies and wave surface elevation on the modelled free surface domain
- Relative elevation between the vessel and the fluid allowing the determination of wave overboard or green water occurrences
Our tools : HYDROSTAR from the Bureau VERITAS
