Fastships
FASTSHIPS
FASTSHIPS (Fast And Simple Tool for Simulation of HIgh Performance Ships) is a software package for simulation of high-speed marine vessels. It is being developed at the Department of Marine Technology at the Norwegian University of Science and Technology (NTNU). Work is ongoing, with a first version recently finished and validated. This version is comprised of two models, one for analyses of hydrofoil vessels and one for slender catamarans.
The hydrofoil vessel model includes force, motion, environment and control system modules, and allows closed-loop simulation of hydrofoil vessels under active flight control. The effects of control system action on vessel motions and power requirement are inherently included in the mathematical model.
Slender catamarans can be analyzed with the second model. This yields resistance estimates that account for trim, sinkage and wind. It has been shown to yield good correspondence with experimental data and RANS simulations for slender catamarans resembling modern fast-ferries.
Contact
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John Martin Kleven Godø Researcher/PhD Candidate
+4790607515 +1(617)372-4739 john.martin.godo@ntnu.no Department of Marine Technology -
Roger Skjetne Professor
+47-73550446 roger.skjetne@ntnu.no Department of Marine Technology -
Sverre Steen Head of Department
+47-73595861 +4793406429 sverre.steen@ntnu.no Department of Marine Technology
Theoretical background
In combination, this allows analyses of any form of hydrofoil system, including foil interaction effects and free surface waves.
The model for slender catamarans is built upon a combination of Michell’s thin-ship theory and frictional resistance estimates based on friction lines.
It comprises novel models on form factors and on the length of the wake hollow downstream of transom sterns.
Details on modelling and validation against experimental data and 3D RANS simulations will be published in a scientific publications which are currently under review.
References will be added as soon as these are available online.
Applications
FASTSHIPS is under active development, with the first version focusing on conventional slender catamaran fast-ferries and fully submerged hydrofoil vessels operating with an active flight control system.
Relevant applications include analyses and minimization of the resistance of slender catamarans, and seakeeping and manoeuvering simulations of hydrofoil vessels under active flight control.
The development team is always on the lookout for interesting challenges to solve.
This might include questions on how to better design or operate relevant types of vessels, evaluations of the accuracy of simulations, quantification of the importance of physical effects or other challenges faced by high-speed vessel designers. If this sounds relevant to you, then please feel free to reach out to us.
Digital resources
Digital resources for the paper entitled "A Resistance Model for Hydrofoil Fast Ferries with Fully Submerged Foil Systems" can be found here.
Clicking "Download files" below takes you to a file server that contains various digital resources.
Here you can find the full geometries of the NTNU Hydrofoiling Fast-Ferry 1 (NTNU HFF1) and the NTNU Fast-Ferry 1 (NTNU FF1), in the form of wavefront (.obj) files. Also included are text files which detail the spanwise distributions of relative camber, relative thickness, twist angle and chord length of the hydrofoil system of the NTNU HFF1.
The NTNU HFF1 vessel is believed to be representative of modern zero-emission hydrofoiling fast-ferry concepts presented by companies such as Artemis Technologies, Candela and Glosten/Bieker Boats.
NTNU FF1 was designed with the aim of replicating the main dimensions and roughly the hull shape of modern fast-ferries currently in operation, based on openly available data and pictures.
FASTSHIPS Hull Generator, a part of the module for analyses of slender catamarans, is published as open source software and can be downloaded from here.