... This paper discusses the impact of scaling effects in the performance of a standalone wing sail, comparing experiments and numerical simulations. The experimental data of a standalone wing sail with a NACA0015 section, tested in the R.J. Mitchell wind tunnel at the University of Southampton...

... The effects of multiple wings interacting and the change in efficiency due to those effects as well as optimal sheeting angles are becoming an important area of study with the advent of wind-propelled ships for goods transport. This research presents a first analysis of wind tunnel tests carried...

... deformation. Furthermore, the experiments revealed that flow behaviours such as the laminar-to-turbulent transition are preserved even with high blockage. The angle of attack at which transition occurs is also preserved in pressurized wind tunnel tests. However, the effect on the forces cannot be fully...

... experiment circular arc wind tunnel aoa production monitoring leading-edge bubble engineering production control simulation separation asymmetric spinnaker spinnaker viola investigation THE 23RD CHESAPEAKE SAILING YACHT SYMPOSIUM ANNAPOLIS, MARYLAND, MARCH 2019 Recent Advances in Downwind...

..., in particular its sensitivity to error and noise in the performance estimation, we contrast the direct optimization of the physical system with the optimization of its numerical model. For the physical system, the optimization procedure was fed with wind tunnel measurements, while the numerical modeling relied...

... also improves the numerical results, with modelling the computational domain as a simple box or as the real wind tunnel results in different flow, with the angle of attack varying by 3°. In conclusion, LES, even if it is very sensitive to the mesh and the choice of the solver, is more accurate than...

... Wind tunnel testing to determine yacht performance has been carried out for at least the last 50 years. A common perception is that experimental methods do not improve significantly over time. This paper shows how modern wind tunnel testing is still the only realistic way of providing a complete...

... in the wind tunnel and at full scale. While flying shape measurements in the wind tunnel are straight forward to do providing quite accurate results, respective measurements at full scale in natural, stochastic environment turned out to be challenging. As a result of the comparison it can be shown that flying...

... The main results of a two-year project aimed at comparing full-scale tests, wind tunnel tests, and numerical analysis predictions are presented. Pressure measurements were obtained from both full-scale tests and wind-tunnel tests, in upwind and downwind conditions. The upwind wind tunnel test...

... This paper describes a method for the acquisition of the flying shape of spinnakers in a twisted flow wind tunnel. The method is based on photogrammetry. A set of digital cameras is used to obtain high resolution images of the spinnaker from different viewing angles. The images are post...

... This paper presents a comparison between wind tunnel and full-scale aerodynamic sail force measurements using enhanced wind tunnel testing techniques to model the full-scale sailing conditions more accurately. The first comparison was conducted by Hansen et al., 2003a, in the Twisted Flow Wind...

... The Glenn L. Martin Wind Tunnel (GLMWT) has developed specialized investigative techniques to evaluate underwater appendages for sailing yachts that have been continuously improved through practice by GLMWT staff. These specialized techniques are required to obtain the best possible differential...

... A parametric series of eight spinnaker models was built and tested in a wind tunnel according to the theory of statistical Design of Experiments. In these models, three sail shape parameters were varied - cross section camber ratio, sail aspect ratio, and sweep. Lift and drag forces were...

... upwind, downwind, and under tow. The experimental approach described in this paper will be useful for the development and evaluation of various seawater drag reduction methods. frequency transition ambient turbulence level instability pressure gradient boundary layer designer wind tunnel...

... targeted narrow bands of operating conditions expected during various legs of the 1997-98 Whitbread Round The World Race™. To achieve this goal, two major development tasks were first completed by the Glenn L. Martin Wind Tunnel (GLMWT), located at the University of Maryland College Park: a. Model Test...

... Tunnel (GLMWT), located at the University of Maryland College Park, is participating in this sail force prediction project as part of the US SAILING University Research Program. The GLMWT effort is primarily in three areas which will be described in detail: 1.Development and evaluation of advanced wind...

... sailing yacht symposium testing method force coefficient designer dynamometer baybea wind tunnel boat .4). .. .. SAILING. = THE THIRTEENTH CHESAPEAKE SAILING YACHT SYMPOSIUM An Investigation of Full Scale Forces Produced by a Sail Nathan Bossett, Herbert Engineering Corporation, San Francisco...