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Boundary Layer Separation and Flow Visualization in Turbulent Conditions

Explore the fascinating phenomena of boundary layer separation and turbulent flow visualization through Reynolds experiments. Witness the effects of Reynolds numbers on laminar and turbulent flows, with examples like drag reduction methods and golf ball dimples. Learn about the dynamics of lift generation, spin effects, and boundary layer adhesion techniques. Dive into the realm of fluid mechanics with animations and real-world examples.

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Boundary Layer Separation and Flow Visualization in Turbulent Conditions

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  1. Turbulence: Examples • Turbulence • Boundary Layer Separations

  2. Reynolds experiment • From Flowmetrics website

  3. Boundary Layer separation: Laminar flow • Reynolds number 15000 • Flow visualization using air bubbles • Viscous drag vs pressure drag BL separation, example with a ball rolling in a hill • Animation • From Efluids website

  4. Boundary Layer separation: Turbulent flow • Reynolds number 30000 • (trip wire for drag reduction) Smooth and ‘dimpled’ golf balls. Laminar vs Turbulent layer • From Efluids website

  5. Higher velocity • Lower velocity • Force due to pressure difference Lift • Magnus effect • Fluid = Lift

  6. Swing • B • spin • Station A

  7. OutSwing • Seam - trip flow • spin- stability

  8. Reverse Swing

  9. Vortices • Boundary layer adhesion by suction • Boundary layer adhesion by adding high momentum fluid

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