Ship resistance/Resistance in Ideal Fluid

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On completing this lesson, you should be able to

  • understand buoyancy
  • understand the various kinds of pressure acting on the body
  • understand the pressure distribution around the body
  • Explain d'Alemberts paradox


  • Read Body in Ideal fluid of Ship Resistance
  • Watch Lecture 1 of video course on Performance of Marine Vehicles at Sea, from 12:30 to 30:20.


After going through the material, you should be able to answer the following questions. You may want to answer these in the Answers section (or write a better answer if already answered). Feel free to add to this list if you have any questions on the material covered.

  1. Why does a ship float?
  2. Why is the hydrostatic pressure opposite to the force of gravity
  3. What is hydrodynamic pressure?
  4. Why does a submerged body in ideal fluid face zero resistance?

Additional QuestionsEdit

  1. Why do we insist that motion of the ship be steady in stating that resistance is zero? (You might want to look at the section on added mass in any book on fluid dynamics)
  2. Why do we insist that the body be submerged and far away from the surface?


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