Hydrodynamic Performance of Ship Hull: CFD Based Design
FEA & CFD Based Simulation Design Analysis Virtual prototyping MultiObjective Optimization
Enteknograte have high-end expertise for Combining FEA and CFD tools for Ship simulation and optimization to give the best performance at the design draft and speed. Also different kind of optimization could be performed with targeting various speed-draft combinations in the operating profile. The overall hydrodynamic performance of a vessel is directly connected to the resistance and propulsive efficiency. The resistance is influenced by the hull shape, the wetted surface area and the configuration of appendages, while the propulsive efficiency is influenced by the propeller open water characteristics and the interaction between hull and propeller.
The performance depends on the variation of operating conditions, i.e. vessel speed, draft and trim. Vessels have traditionally been optimized for a single condition, normally the contract speed at design draft. With the help of state-of-the-art Computational Fluid Dynamics (CFD) tools and modern computers it is now possible to optimize a vessel for various conditions in which the vessel will be trading.
Enteknograte has worked with hull optimization for several years. Enteknograte ’s experts have extensive relevant experience within ship hydrodynamics and energy efficiency, applied to numerous vessel types and sizes including the major segments: tankers, bulk carriers and container vessels.
All simulations of resistance and wake assessment will be performed using advanced CFD packages. A vessel’s hydrodynamic properties, including hull design and hull-propeller interaction, resistance, maneuvering, and seakeeping, must all be optimized together in order to achieve an energy-efficient design which can perform as required under these challenging conditions. By developing a digital twin of the vessel in the design phase, our solutions allow early evaluation and optimization of hull forms under realistic conditions, helping the marine industry develop innovative, better designs faster.
Use our CFD hydrodynamic solutions to:
- Perform full-scale CFD analysis of hull forms and appendages, removing any scaling uncertainties.
- Predict hull resistance under realistic operating conditions, including waves and open water.
- Analyze vessel performance when maneuvering, including self-propulsion.
- Ensure vessel designs meet seakeeping performance criteria.
- Examine wave loading and ensure structural stability.
- Optimize hull forms or appendages, including energy saving devices.
Enteknograte offers a Virtual Engineering approach with CFD and FEA tools such as Ansys Fluent, StarCCM+ for flows simulation and FEA based Codes such as ABAQUS, Ansys, Nastran and LS-Dyna, encompassing the accurate prediction of in-service loads, the performance evaluation, and the integrity assessment including the influence of manufacturing the components.
Hull Optimization Process:
A typical project for hydrodynamic hull optimization may include:
- Establishing a close dialog between Enteknograte and the Client;
- Defining a realistic operating profile;
- Discussing and combining Enteknograte ’s design ideas with the client’s design philosophy to obtain an optimal hull in both a hydrodynamic and building perspective;
- Optimizing the hull forebody based on the operating profile;
- Optimizing the hull aftbody to improve the propulsive efficiency, including consideration on propeller and machinery configuration;
- Assessing the Energy Efficient Design Index
The delivered value for the client is increased confidence in the hydrodynamic performance of the hull. Typically, considerably improved fuel efficiency and reduced gas emissions are achieved throughout the vessel’s lifetime.
Scope of our work for Hull Design included:
- Establishing a weighing matrix for the vessel’s relevant operating profile;
- Optimizing the hull forebody and aftbody (shoulders, bulb, transom stern height, etc.) based on the operating profile;
- Analyzing the wake and propulsion efficiency;
- Predicting the speed – power and fuel oil consumption curves;
- Assessing the preliminary EEDI;
Transient Resistance, Propulsion, Sea-Keeping and Maneuvering Simulation
Using cutting edge solver technology, Enteknograte’s customers have been able to tackle some of the most demanding problems that the marine industry has to offer, allowing us to predict how designs will react in operation, before budget is committed to the construction of expensive prototypes. Enteknograte’s Engineering team provides analyses ranging from: ship keeping, slamming and sloshing; wave and wind loading on offshore and underwater structures; oil and pollutant dispersions to cavitation control and propulsion system optimization.
CFD analysis can optimize ship hull design, sail shape and propeller blades. Analysis predicts water free surface around the ship hull which helps to accomplish optimal hull shape with low hydrodynamic drag. CFD provides information to optimize sail shape and location for efficient and stable ship. CFD analysis can optimize propeller blade design for energy efficient ship and avoid cavitation on the blades. Enteknograte’s Engineering team provides analyses ranging from: ship keeping, slamming and sloshing, wave and wind loading on offshore and underwater structures, oil and pollutant dispersions and cavitation control to propulsion system optimization.
Marine Propulsion System Design: Combination of CFD & FEA for Detailed Fatigue, Strength and Vibration Analysis
Marine propulsion system designers rely on the combination of CFD and FEA software for fatigue, strength and vibration analysis. Proper propulsion system/components analyses during the design phase help avoid delays in delivery and damage problems in operation, thereby reducing expensive off-hire. Professional and reliable software and experts is essential for the design of a robust system.
Deep knowledge and experience combining with advanced CFD and FEA software enable us to handle any problem with any level of complexity in very short time. We Use CFD tools such as MSC Cradle, Ansys Fluent, Siemens Star-ccm+ and FEA Tools such as Abaqus, Nastran and LS-DYNA with combination of very experienced engineers to help our customers in:
- Investigation of course keeping and turning ability
- Motions analysis of FPSOs (Floating production storage and offloading)
- Manoeuvring at low / variable speed in shallow and confined seaways/ unsteady maneuvers: tacking, gibing
- Torsional Vibration Simulation with Coupled CFD and FEA softwares to identify the interaction between components, an essential part of the system and functionality assessment
- (unlimited) deep water-Shallow water condition
- Floating wind turbine design and simulation including dynamic effects due to elastic response of wind, waves in rotor blades, the tower, and the mooring lines.
- Monohulls / conventional ships
- Multi hulls: catamarans, SWATH, trimarans
- Asymmetric ships (monohulls as well as catamarans)
- Submarines
- FEA simulation of torsional vibration regarding ice impacting on the propeller
- Fixed models as well as free to trim and sink conditions
- Coupled Hydrodynamic CFD Simulation with structural finite element analysis to Simulate transient strcutural behavior in irregular waves
- Added resistance in waves
- Combined drift and gyration
- Ship resistance analysis
- Hydrodynamic Interaction between Bodies: shielding effects, Forward speed effects
- Dynamic trim and sinkage behaviour
- Propulsion and propeller performance optimization
- Ship wake
- Shaft fatigue and lifecycle calculations of marine shafts torsional vibration stress levels based on low cycle, high cycle and transient fatigue
- Vortex induced vibration analysis
- Whipping and slamming impacts simulation: Wave-induced hull vibration for the assessment of hull girder collapse characteristics.
- Erosion CFD Simulation including hydrodynamics effects
- Offshore equipment stability: Buoyancy and centre of gravity studies
- Added masses for subsea hardware CFD calculations
- Hull performance assessment and wave-making CFD solutions
- Sea keeping behavior in regular or irregular waves
- Calculation of drag and lift on appendages
- Sail or wing optimization
- Ship structural analysis and design with FEA software such as Ansys, Abaqus and Nastran
- Hydrodynamic plant & equipment
- Tidal Power System Hydrodynamic Design
- Optimal gearbox lubrication
CFD Optimization of Hull Form Including Hydrodynamics considerations
The hullform of a ship is decisive for its energy consumption and efficiency in that a large part of the overall resistance is determined by form effects and the aft body shape influences the propulsive losses. The shape related aspects are traditionally the domain of a ship model basin. While in the past numerous physical ship models have been created and tested in a towing tank to find the optimal solution, this role has been taken over by CFD, numerical methods which allow analyzing the performance of a ship hull before the first model is built. Enteknograte Engineering team use advanced CFD and Optimization software such as Ansys Fluent, Siemens Star-ccm+ and MSC Cradle to compute hull resistance at different stages of a design.
Coupling Hydrodynamic CFD Simulation in Ansys Fluent, Siemens Star-ccm+ and MSC Cradle with structural finite element analysis (Abaqus, Ansys) to Simulate most complicated industrial problem
Enteknograte has vast experience in the modelling of hydrodynamics using CFD simulation in a wide range of applications. The experienced CFD staff can offer an accurate and detailed analysis of the flow and be able to identify viable areas of improvement for implementation and design. This Simulation can be used to model:
- Hydrodynamic Interaction between Bodies: shielding effects, Forward speed effects
- Shielding effects of a pier adjacent to a ship, an important aspect in the design of breakwaters and how they affect mooring systems.
- Design and analysis of mooring systems, including intermediate buoys and clump weights
- Motions analysis of FPSOs (Floating production storage and offloading)
- Calculation of shielding effects of ships and barriers
- Multiple body interactions during LNG transfer
- TLP tether analysis
- Dropped object trajectory calculations
- Concept design and analysis of wave and wind energy systems including multiphase condition including hydrodynamic effects
- Simulation of lifting operations between floating vessels
- Discharging landing craft from mother ships
- Transportation of large offshore structures using barges/ships
- Float over analyses
- Motion analysis of spar vessels
- Static and dynamic initial stability including the effects of mooring systems and other physical connections
- Coupled Hydrodynamic CFD Simulation with structural finite element analysis to Simulate Transient structural behavior in irregular waves
- Coupled cable dynamics in static and dynamic analysis to modeling of mooring system loading and response in deep waters.
- Dynamic positioning system
- Towing force provided by a tug
- Damping system with unusual characteristics
- Suction force between two ships close together, or between a ship and the sea bed
Hydrodynamics & HydroAcoustics simulation for AIV (Acoustic Induced Vibration)
Ship Stability & Safety Analysis Including Hydrodynamics & Aerodynamics Effects
Cavitation in Propulsion Systems
Hydrodynamic Performance of Ship Hull: CFD Based Design
Hydrodynamics CFD simulation, Coupled with FEA for FSI Analysis of Marine and offshore structures
Floating, Fixed & Gravity-Based Structures Design Including Hydrodynamics & Aerodynamics Effects
Hydropower, Solar Power and Biomass
Structural Dynamics Integrity & Vibro-Acoustics Simulation for Marine & Shipbuilding Industry
Hydroplaning (Aquaplaning) Simulation
Turbine, Pump & Compressor (Axial or Centrifugal)
NVH based Design and Considerations for Marine and Shipbuilding Industry including Ship, Boat, Yacht, Vessels and offshore structures
The challenge for the NVH specialists is to support the concept and design development process by reliable recommendations just-in-time prior concept or design freeze. Enteknograte’s specialists particularly use advanced methodologies for NVH simulation and optimization for Marine and Shipbuilding Industry:
- FEA based Ship, Boat, Yacht, Vessels Powertrain
- Structural Optimization
- Optimization of Ship, Boat, Yacht, Vessels Engine Dynamics based on MBD ( Multi-Body Dynamics Simulation)
- Concurrent optimization of combustion efficiency with NVH considerations for Vessels
- Ship, Boat, Yacht, Vessels and offshore structures Interior Noise Simulation based on measurement and CAE
- Ship, Boat, Yacht, Vessels and offshore structures Exterior Noise Simulation with couple use of CFD and FEA solvers
- Objective Analysis of Sound Quality
