Renzsch, H., Graf, K. and Müller, O.: Strömungssimulation und Windkanalexperiment für die Analyse von Vormwind-Segeln Proc. 26th Symposium Yacht Design and Yacht Construction, Hamburg, 11/06
Yacht Research Unit Kiel (YRU-Kiel) has developed a set of methods for the analysis of downwind sails. It is based on numerical as well as experimental investigations. Experiments in YRU-Kiel’s new twist flow wind tunnel are carried out to predict sail force coefficients of families of downwind sail sets. In addition a method for the measurement of the flying shape based on photogrammetry has been developed. It allows to predict the geometry of the flying shape of the spinnaker in the wind tunnel with very low turn around times. The numerical approach is based on a fluid structure interaction (FSI) method, combining a RANSE solver for the prediction of the viscous turbulent flow around the spinnaker and a finite element based code to predict the deformation of the spinnaker under wind load. Experiments and simulation interact with each other. While wind tunnel experiments and photogrammetry are used to validate the results of the FSI code, the FSI code in turn allows to study details of the flow without scaling effects of experiments such as low Reynolds number and sail cloth material effects. The paper describes the test setup, testing procedures, the photogrammetry and the numerical method and provides some results with a prototype family of spinnakers.
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