1. Streamlining

2. Aerodynamics
Analyzing a moving body in a gas
Aero – Air
Dynamics - Moving

3. Streamlining The process of reducing turbulence by altering design
To do this, change shape, material and surface features
Goal: To reduce Drag
Drag is the force that acts against an object’s motion through a fluid
Drag is friction in a fluid

4. Streamlined flow is LAMINAR FLOW!!!

5. How are these designed to MAXIMIZE or MINIMIZE DRAG?

6. Parachute

7. Train

11. Testing Swimsuits
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13. How to Streamline?
Use wind tunnels, water tanks and computer simulations for research
To ‘see’ laminar flow, use pressure sensitive beams, electronic sensors, drops of coloured water, small flags and plumes of smoke

14. To do: Look at Figure 4 on Pg 284 Read pg 284 and answer:
What features are used to reduce drag:
In a car?
Shark?
Submarine?

15. Drag Coefficient (CD) Lower CD, lower amount of drag
Parachute - CD = 1.35
Cars – 1930’s – CD = 0.7
Cars – 2000’s – CD = 0.4
Look at Fig 8, Pg 286

16. What is this?

17. The Case of Shark Skin and Golf Balls!

18. Work
Pg 285 # 2
Pg 286 # 7, 8, 9
Pg 287 # 5