Expertise in Marine Hydrodynamics Veri STAR Energy Efficiency

Expertise in Marine Hydrodynamics Veri. STAR Energy Efficiency Hydrodynamic efficiency evaluation Hydrodynamic performance optimisation Trim optimisation software Expertise in Marine Hydrodynamics

Who We Are … Partners Bureau Veritas and Hydr. Ocean have setup an efficient partnership enabling to optimise ship’s overall hydrodynamic efficiency, using the most advanced and accurate software available …with whom we progress constantly to bring better solutions to our clients Hydr. Ocean is a spin off from the Fluid Dynamic Laboratory of Ecole Centrale Nantes. A highly efficient research partnership is setup, which aims at promoting the most innovative research tools developed in their laboratory and also making them accessible to industrial partners Expertise in Marine Hydrodynamics

Hydrodynamic efficiency evaluation Evaluation with state of the art CFD tools § § Hull and appendages resistance Seakeeping in regular or irregular waves Manoeuvring efficiency of hull, rudder and thrusters Propeller open water and ship self-propulsion At any time in ship’s life § Evaluation of initial design for new build § Diagnostic of vessels in service § Identification of possible improvements Key benefits § Reduced costs and duration compared with towing tank § Accuracy of advanced CFD solvers Expertise in Marine Hydrodynamics

Veri. STAR Energy Efficiency: Hydrodynamic performance optimisation Our approach Efficient methodology to increase ship efficiency from a hydrodynamic point of view: • Phase 1 : Design diagnostic • Phase 2 : Optimisation • Phase 3 : Final evaluation Adapted hydrodynamic software and hardware: • All computations with state-of-the-art fully viscous free • • surface Navier-Stokes solvers Solvers take into account all non-linear effects with high accuracy Unlimited number of licences and access to over 2000 CPUs Expertise in Marine Hydrodynamics

Veri. STAR Energy Efficiency: Hydrodynamic performance optimisation ins Up ga o 9% t General hull shape parametric optimisation in resistance (curve section area, main hydrostatics ) Optimal trim angle evaluation for each draft and speed Propeller design evaluation • Propulsive coefficients (Kt, Kq, hprop) • Cavitation inception • Pressure pulse Bulbous bow shape parametric optimisation. Total drag and wave field reduction. Up t o ains g 7% Bow or stern thrusters shape optimisation. • Orientation of level on flow • Evaluation of Energy Saving devices Stern, wedges, ducktail shape optimisation in presence of propeller ((1 -t), (1 -w), h hull ) Propulsion appendages (rudder, shaft brackets …) orientation and shape optimisation ins Up ga to 5 % Expertise in Marine Hydrodynamics

Veri. STAR Energy Efficiency: Trim Optimisation Software Business challenge § Increase of fuel cost § New IMO regulations Requirement to have more energy efficient ships Solution : On board TOS software § § Stand alone software running on Windows OS User friendly and intuitive interface Gives the optimal trim for specific operating conditions Optimal trim based on advanced hydrodynamic calculations, allowing the generation of a hydrodynamic database of the ship ains Key benefits § § Up g to 3 % No ship modification required Reduce fuel consumption of ships Increase profitability of ship owner Minimise impact of the company operations on the environment Expertise in Marine Hydrodynamics

Veri. STAR Energy Efficiency: Trim Optimisation Software Our Approach § TOS based on a hydrodynamic database, generated by a trim, speed and displacement systematic study § All computations with state-of-the-art fully viscous free surface Navier-Stokes solvers § Solvers take into account all non-linear effects with high accuracy 2 % gains Base trim 3 % losses Comparison of numerical and experimental results of a trim variation analysis Expertise in Marine Hydrodynamics

Hydrodynamic Expertise : Propulsion & Energy saving devices § Self propulsion of a fully appended ship Accurate evaluation of : • • • Propulsive coefficients All non-linear and free surface effects Cavitation risks Pressure pulse All interactions between appendages, propeller and hull • Overall ship efficiency CFD Exp. Diff. RPM 9. 57 9. 69 1. 3% Kt 0. 214 0. 213 0. 6% KQ 0. 039 0. 041 2. 5% 1 -t 0. 762 0. 759 0. 3% 1 -w 0. 845 0. 861 1. 8% Expertise in Marine Hydrodynamics

Our tools Hull Modeller Opt. Nav § Hull modeling software dedicated to ship performance optimisation § Empirical resistance estimation § Hydrostatic and stability Expertise in Marine Hydrodynamics

Our tools Potential flow § Reva : Fast resistance evaluation solver § Hydro. STAR: Diffraction Radiation Seakeeping solver Expertise in Marine Hydrodynamics

Our tools RANSE Solver § ICARE Fast and accurate free surface Navier-Stokes solver § ISIS-CFD § Star. CCM+ VOF free surface Navier. Stokes solver adapted to marine applications Expertise in Marine Hydrodynamics

Our tools SPH • SPH-Flow : Innovative solver based on particle discretisation for advanced applications § High dynamics § Extreme waves § Complex geometries § FSI Expertise in Marine Hydrodynamics

Project Examples Cruise ferry bulbous bow optimisation Trim optimisation Stern optimisation with actuator disk Expertise in Marine Hydrodynamics

Application and validation : Optimisation of Albatros bulbous bow § Ship description • • Length : 174 m Speed : 19 knots 460 cabins Managed by Vship § Decision of the ship owner to design a new and optimised bulbous bow § Methodology applied for this project • Parametric evaluation of feasible bulbous bow designs (around one hundred) • Validation in towing tank of initial and optimal design • Built and sea trial for final evaluations § Set up of bulbous bow deformations in cooperation with Tekno Consulting : 3 deformation parameters (length, width, height) Expertise in Marine Hydrodynamics

Cruise ship - Bulbous Bow Optimisation Expertise in Marine Hydrodynamics

Application and validation : Optimisation of Albatros bulbous bow § Results: Total drag variation presented in a 3 D chart (gains in blue, loses in red) Wider Higher Optimal er Long Initial Expertise in Marine Hydrodynamics

Application and validation : Optimisation of Albatros bulbous bow § Comparison of numerical and experimental resistance gains at model scale § Comparison of pressure & wave fields and streamlines Initial Optimized Expertise in Marine Hydrodynamics

Application and validation : Optimisation of Albatros bulbous bow § Bulb construction and sea trial tests Optimized Initial § Feedback from sea trial tests • Increase in cruise speed (at 80% of engine power) up to 1 kt from 19. 5 kts to 20. 5 kts • Reduction of fuel consumption and CO 2 émissions by 5% at full scale • Total cost : With numerical optimisation study, towing tank validation and architectural costs Bulb construction and refit costs ROI estimated to be less than 1. 5 years regarding fuel consumption reduction Expertise in Marine Hydrodynamics

BV – Hydr. Ocean Services delivered today Expertise in Marine Hydrodynamics