Paper Title: Super Yacht Airwake: Comparing methods of Assessment and their Application to Design
G S Hawkes, R M Scott, C J Carter and A Payne, Frazer-Nash Consultancy Limited, UK
Understanding the aerodynamic environment, or airwake, around a super yacht is a key area of consideration to the naval architect during design. The airwake is characterised by structure-induced flow disturbances and the presence of ventilation and exhaust plumes. These features may significantly influence the safety of helicopter operations, the dispersion of gases away from the yacht, and passenger and crew comfort. If the airwake is poorly understood, contractual requirements may not be met and certification may not be achieved. Traditionally, airwake has been characterised by wind tunnel tests of scale models. Although mature and well understood, a number of significant challenges remain to the ease with which airwake assessments can be included during yacht design and risk reduction activities during the bid stage. Broadly speaking, the key experimental challenges are the requirements for a detailed scale model, means of data capture and storage, and consistent scaling of flow and thermal effects. An alternative approach is to predict the airwake using Computational Fluid Dynamics modelling. This paper discusses the application of airwake assessments to super yacht design and reviews both experimental and computational approaches in terms of the associated costs and benefits to the designer. The results of a computational airwake assessment for a typical large yacht are presented in terms of quantifying the turbulence field and thermal disturbances within the wake of the superstructure. Finally, recent developments in turbulence simulation are discussed with reference to their future potential uses in airwake modelling.
Transactions RINA, Vol 152, Part B1, International Journal of Small Craft Technology, Jan-Jun 2010
DOI No: 10.3940/rina.ijsct.2010.b1.94
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