sailing yacht’s hull design

Download Sailing Yacht’S Hull Design

Post on 14-Jun-2015

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Hull resistance to motion components

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  • 1. Sailing Yachts Hull Design

2. Index:

  • Forces and moments on a sailing yacht
  • Resistance components:
    • Viscous resistance:
      • The Friction resistance
      • The viscous pressure resistance
    • Wave resistance.
    • Additional resistance.

3. Forces and moments on a sailing yacht 4. Resistance components:

  • There are three major components:
        • Viscous resistance
        • Wave resistance
        • Additional resistance

5. The Viscous resistance *Due to the frictional forces between the hull and the water *The viscosity gives rise to this component. *Boundary layer is the water close to the hull that moves with it. 6. The Friction resistance *Directly due to the friction between the water and the hull surface. *Based on the Reynolds number Rn=V*L/vRv=1/2*p*Aw*V*Cv *The wetted area gives rise to this component 7. The viscous pressure resistance *Based on the Bernouillis ecuation that relates the velocity of the flow with its pressure. *The bow and stern pressures are higher than in the middle part of the hull. *It depends basically on the shape of the hull 8. Wave resistance. *The second major resistance component *When a yacht sails through the water, deflects a volume of water. *This one generates two trains of waves. *The wave formation takes energy from the movement of the yacht. *Based on the Froude number: Fn=V/(g*L)1/2 9. Additional resistance. *Due to the aerodynamic resistance *Due to the roughness Due to the hydrodynamic resistance of HEEL, PROPELLER, RUDDER and LEEBOARD 10. 11. THE END

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