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ASE 120K - Fluid Dynamic Drag on a Sphere

ASE 120K - Fluid Dynamic Drag on a Sphere - ASE 120K...

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ASE 120K Lecture Notes The University of Texas at Austin Department of Aerospace Engineering & Engineering Mechanics ASE 120K Low Speed Aerodynamics Laboratory FLUID DYNAMIC DRAG ON A SPHERE Prof. Charles E. Tinney WRW-301A 512.471.4147 [email protected] Instructor:
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ASE 120K Lecture Notes Outline Blunt Body Flows Drag on a sphere/ cylinder Inviscid Potential Flow Theory Experimental Observation (the real world) Subcritical Reynolds Critical Reynolds Supercritical Reynolds Fluid Dynamic Drag on a Sphere Surface distribution of pressure coefficient Subcritical Supercritical conditions Drag coefficient versus Reynolds number
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ASE 120K Lecture Notes Drag of Blunt Bodies (A. Smits) Body moving through a fluid experiences drag force of which there are two distinct components Friction drag Occurs between moving fluid and surface over which fluid is flowing Associated with viscous forces in the boundary layer (laminar, transitional or turbulent) Scales with Reynolds (sensitive subject) Important for attached flows (streamlined bodies such as airfoils) Based on the surface area exposed to the fluid (wetted area) Pressure drag Produced by the formation of eddying motions that develop as the body passes Associated with the formation of a wake. Less sensitive to Reynolds number than friction drag. Important for separated flows (airfoils at high angles of attack) Based on the cross-sectional area of the body. Both exist because of viscosity (no-slip) If fluid is inviscid then no drag force!
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