Week 8 - Laminar & Turbulent Flow

Question 1

Relative velocity equation

Answer 1

Objects velocity - velocity of wind

Question 2

A cyclist traveling 15m/s against a headwind of 5m/s, how fast is the cyclist moving relative to the wind?

Answer 2

15 - (-5) = 20m/s

The cyclist is moving 20m/s relative to the wind as he needs to overcome it.

Question 3

Boundary layer

Answer 3

Layer of fluid immediately adjacent to the object/body

Question 4

A cyclist traveling 15m/s with a tailwind of 5m/s, how fast is the cyclist moving relative to the wind?

Answer 4

15 - 5 = 10m/s

The cyclist is moving 10m/s relative to the wind. It feels like you aren’t traveling as fast.

Question 5

Laminar Flow

Answer 5

Smooth and streamlined

Question 6

Turbulent Flow

Answer 6

Relative velocity of object is high, where the boundary layer is unable to follow along contour of object, boundary layer separates and creates low pressure wake behind object