Turbulence: Examples

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
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