Trans RINA, Vol 156, Part B2, Intl J Small Craft Tech, Jul-Dec 2014


(5) Looking at the following graphics, showing the pressure coefficient on the


windward side, this


overestimation of cP appears to be an error due to surface resolution near the leading edge. Actually, there seems to be an uncertainty in determining the stagnation point due to apparently insufficient grid resolution. It seems that, under the condition of local incident flow (incl. upwash) tangential to the surface, on a thin surface like a sail, the stagnation point is always on the second column of elements back from the leading edge. Presumably, the magnitude of


this error should resolution is increased. Author’s response, point (4) reduce when mesh


Author’s response, point (5)


REFERENCES 17. GRAF, K.,


Investigations 21. RENZSCH, of


RENZSCH, H.: RANSE Downwind Sails and


Integration into Sailing Yacht Design Processes, Proc. 2nd high Performance Yacht Design Conference, Auckland, NZL, 2/2006


18. RENZSCH, H., MÜLLER, O., GRAF, K.: FlexSail – A


Fluid-Structure-Interaction


Program for the Investigation of Spinnakers, International Conference on Innovation in High Performance Sailing Yachts, Lorient, FR, 5/2008


19. GRAF, K., BOEHM, C., RENZSCH, H.: CFD- and VPP-Challenges in the Design of the New AC90 America‘s Cup Yacht, The Chesapeake Sailing


19th Annapolis, MD, US, 03/2009 20. RENZSCH, H., GRAF, K.: Fluid


Yacht Symposium, Structure


Interaction Simulation of Spinnakers – Getting Closer to Reality, 2nd International Conference on Innovation in High Performance Sailing Yachts, Lorient, FR, 6/2010


H., Graf, K.: Fluid Driven Sail


Interaction Simulation of Spinnakers – Towards Simulation


Design,


International HISWA Symposium on Yacht Design and Yacht Construction, Amsterdam, NL, 11/2010


Structure 21st


B-108


©2014: Royal Institution of Naval Architects


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