Search
 
 

FLUID MECHANICS - CASE STUDY

    Introduction


An Attack Submarine in the Deep Sea

 

A 1:10 scale model of an attack submarine is being tested in a water tunnel. The drag force ratio the submarine in the deep sea and the submarine model in the tunnel need to be estimated. The submarine cruises at 4 m/s in seawater (viscosity, μ = 1.2×10-3 N-s/m2 and density, ρ = 1,030 kg/m3). The fresh water in the tunnel is maintained at a temperature of 40 oC.

   
  Questions

 

What should the velocity of the model be in the tunnel? Determine the drag force ratio of the submarine prototype and model.

     
    Approach


 
  • Assume the submarine is far from the water surface.
  • Assume the compressibility of water is negligible.
     
   
 
Practice Homework and Test problems now available in the 'Eng Fluids' mobile app
Includes over 250 problems with complete detailed solutions.
Available now at the Google Play Store and Apple App Store.