Turbulence: Examples Turbulence Boundary Layer Separations.

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Presentation transcript:

Turbulence: Examples Turbulence Boundary Layer Separations

Reynolds experiment From Flowmetrics website

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

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

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

Swing B spin Station A

OutSwing Seam - trip flow spin- stability

Reverse Swing

Vortices Boundary layer adhesion by suction Boundary layer adhesion by adding high momentum fluid