- #1

lebronJames24

- 10

- 0

- Homework Statement
- similar to my previous post, this isnt a specific question, but more so a topic that I have to cover in a slideshow

- Relevant Equations
- no necessary equation, but the drag equation is relevant so 1/2 p v^2 Cd A

Ok so far, from my understanding, during the transitionary period from laminar to turbulent flow, an object is in drag crisis. For my application, I am attempting to understand this phenomena for a knuckleball in soccer. I am trying to understand what properties of fluids are responsible for this phenomena.

On a more general question, I do not understand how the quick steep drop in the force of drag on a graph is significant to this phenomena.

Lastly, I have attached a graph of a drag force vs relative reynolds number graph. Am i correct in saying that if all the variables for the reynolds number are held constant aside from velocity, then the circled parts of the graph represent the velocity at which a ball would knuckle? (assuming that the graph is one of a soccer ball)

Last, last thing - how does the surface of a ball affect the drag crisis? I have attached a second graph of two different golf balls with different surfaces having different lines. Why is this?

On a more general question, I do not understand how the quick steep drop in the force of drag on a graph is significant to this phenomena.

Lastly, I have attached a graph of a drag force vs relative reynolds number graph. Am i correct in saying that if all the variables for the reynolds number are held constant aside from velocity, then the circled parts of the graph represent the velocity at which a ball would knuckle? (assuming that the graph is one of a soccer ball)

Last, last thing - how does the surface of a ball affect the drag crisis? I have attached a second graph of two different golf balls with different surfaces having different lines. Why is this?