Sailing Yacht’S Hull Design

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Hull resistance to motion components

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Sailing Yacht’S Hull Design

  1. 1. Sailing Yacht’s Hull Design
  2. 2. Index: <ul><li>Forces and moments on a sailing yacht </li></ul><ul><li>Resistance components: </li></ul><ul><ul><li>Viscous resistance: </li></ul></ul><ul><ul><ul><li>The Friction resistance </li></ul></ul></ul><ul><ul><ul><li>The viscous pressure resistance </li></ul></ul></ul><ul><ul><li>Wave resistance. </li></ul></ul><ul><ul><li>Additional resistance. </li></ul></ul>
  3. 3. Forces and moments on a sailing yacht
  4. 4. Resistance components: <ul><li>There are three major components: </li></ul><ul><ul><ul><ul><li>Viscous resistance </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Wave resistance </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Additional resistance </li></ul></ul></ul></ul>
  5. 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. 6. The Friction resistance *Directly due to the friction between the water and the hull surface. *Based on the Reynolds number Rn=V*L/v Rv=1/2*p*Aw*V*Cv *The wetted area gives rise to this component
  7. 7. The viscous pressure resistance *Based on the Bernouilli’s ecuation that relates the velocity of the flow with it’s 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. 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. 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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