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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Ivan Schrooyen1, Mikael Berton2 and Karl Randle1
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DOI:10.17265/2159-5879/2016.06.002
Affiliation(s)
1. ULSTEIN DESIGN & SOLUTIONS, Ulsteinvik/Norway
2. LEMMA, Biot/France
ABSTRACT
This paper presents recent naval applications of the SWENSE (Spectral
Wave Explicit Navier-Stokes Equations) approach implemented for the first time
with high order fully unstructured schemes and an efficient level-set method to
capture free surface flows around realistic hull geometries. Numerical
simulations in waves and/or viscous flows still lead generally to very large
CPU times because of grid requirements to ensure a good propagation of incident
waves in the meshed part of the fluid domain that makes unreachable any hull
design optimization process in an industrial context. Furthermore, even if the
SWENSE method clearly shows promising results in an academic context in both
regular and irregular waves, the most recent publications still highlight
several issues that remain unresolved up to now, e.g. poor scalability,
diffusive wake pattern, non-versatile structured mesh approaches and only very
few validation test cases are carried out on Wigley or DTMB 5415 hulls. In
order to overcome those numerical difficulties and get an in-depth validation
of the method on several cases in realistic wave conditions, a two and a half
years’ research project has been achieved involving several steps, starting by
a set of dedicated model test experiments later used as reference for the
validation of the method. The CFD commercial code ANANAS™ used and developed in
this research program is presented and validated in detail. The use of high
order schemes on unstructured grids in combination with these SWENSE method and
level-set approach offer to
the maritime industry an innovative and state of the art method to achieve
unequaled accuracy, low computation time and some unique advantages such as,
amongst others, the end of the numerical wave propagation problems. The results
of the validation were pleasing and can be considered as acceptable in general,
with some challenges remaining to the solved. Results obtained indicate that an
optimization processes in waves in realistic conditions is now affordable in an
industrial context.
KEYWORDS
CFD simulation, SWENSE, level-set, ship design, optimization, waves, added drag.
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