2.25: Advanced Fluid Dynamics Section 1: Continuum viewpoint and the equation of motion Section 2: Static Fluids Section 3: Mass Conservation Section 4: Inviscid flow - differential approach Section 5: Control Volume Theorums Section 6: Navier-Stokes equation and viscous flow Section 7: Similarity and dimensional analysis Section 8: Boundary layers, separation and effect on drag/lift Section 9: Vorticity and circulation Section 10: Potential flows; lift, drag and thrust production Section 11: Surface tension and its effect on flows Section 12: Introduction to turbulence Back to 2.25 Home | Back to Section 5
		Problem 5.11: Air Cushion Vehicle

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		Use a control volume in the shape of a hemisphere with radius r>R, centered at the axis of the craft just above the ground, with a bottom surface just above the ground. Show that the momentum flow rate through the hemispherical part is negligibly small compared with the pressure force on the CV. (See also Problem 5.10!)