An investigation of ship airwakes using Detached-Eddy Simulation

Forrest, James S. and Owen, Ieuan (2010) An investigation of ship airwakes using Detached-Eddy Simulation. Computers & Fluids, 39 (4). pp. 656-673. ISSN 0045-7930

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Computational Fluid Dynamics simulations of ship airwakes have been performed using Detached-Eddy
Simulation (DES) on unstructured grids. A generic simple frigate shape (SFS2) and a Royal Navy Type 23
Frigate (T23) have been studied at several wind-over-deck (WOD) conditions. A comprehensive validation
exercise has been performed, comparing CFD results of the airwake calculated for the SFS2 with high
quality wind tunnel data provided by the National Research Council of Canada. Comparisons of mean
quantities and velocity spectra show good agreement, indicating that DES is able to resolve the largescale
turbulent structures which can adversely impact helicopter–ship operations. An analysis of the airwake
flow topology at headwind and Green 45 conditions highlights the dominant flow features over the
flight deck and it is shown that significant differences exist between the two WOD angles. T23 airwake
data has been compared to full-scale experimental results obtained at sea. It is shown that the inclusion
of an atmospheric boundary layer velocity profile in the CFD computations improves the agreement with
full-scale data. Qualitative comparison between the simple frigate shape and T23 airwakes shows that
large-scale flow patterns are similar; but subtle differences exist, particularly at more oblique WOD

Keywords:computational fuid dynamics, airwake, detached eddy simulation, frigate, bluff body
Subjects:H Engineering > H141 Fluid Mechanics
Divisions:College of Science > School of Engineering
ID Code:6297
Deposited On:27 Sep 2012 15:07

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