Interview with WB-Sails.
CJ: On your web site you state "In the last few years, advances in CFD (Computer Fluid Dynamics) and FSI (Fluid Structure Interaction) have changed the way we perceive sail aerodynamics. Old beliefs are proven wrong and new features found."
What old beliefs are wrong and what new features are found, in short?
- The mast is not just a drag-device: it can contribute significantly to the driving force of the sails.
- On the windward side of the sails, flow separation occurs rather through luff separation vortices than bubbles.
- The turbulence always present in natural wind may lead to different performance on different days & weather.
- The presence of the hull effects the flow around sails, so it needs to be included in the simulation.
- On leeward side of the main, the leech vortex from the head of the jib "rips" the flow loose from the mainsail surface, causing a conical separation area on the main at the hounds level.
- On the leeward side of the jib, separation propagates upwards from the tack, as the foot vortex bursts from the deck.
CJ: Thanks for interesting information. Would you say that you now can realistically simulate the action of sails + mast + hull computationally? If not, what computational simulations would be of interest to you?
CJ: Interesting!
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