Lecture03 - Compressible Flow • Typical flow features in...

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Flow Classification Many classifications possible: Inviscid vs viscous Laminar vs turbulent Compressible vs incompressible Internal vs external Steady vs unsteady Forced vs unforced See Section 2.6 for more details
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Compressible Flow Important to distinguish between a compressible flow and a compressible fluid ! Most liquids are close to incompressible Gases are typically highly compressible Important parameter for compressible flow: Mach number = flow speed/speed of sound Incompressible fluids: speed of sound Rule of thumb: Flow is compressible if Mach number is greater than approximately 0.3
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Unformatted text preview: Compressible Flow • Typical flow features in compressible flow: shock wave Turbulent Flow • Most flows of practical importance to engineers are turbulent • Turbulent flows are characterized by: ‣ Irregular motion, random fluctuations ‣ Vortices, mixing ‣ Unsteadiness, three-dimensional • Reynolds number is an important parameter that characterizes laminar/turbulent flows Turbulent Flow • Turbulence leads to larger drag for streamlined bodies (such as an airfoil). .. • ... but for blunt bodies (such as a golf ball), turbulence can reduce drag www.aerospaceweb.org...
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Lecture03 - Compressible Flow • Typical flow features in...

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