- #1
JTC
- 100
- 6
Consider a ball flying through the air.
When there is turbulence, and the flow separates, say on a SMOOTH ball, then in the rear, there is circulation in the wide wake. There is pressure on the front, but no pressure on the rear due to the fact that the fluid is "busy" circulating around. So there is form drag.
When there is NO turbulence (or little) and the flow does not separate as early, say on a golf ball, then there is LESS circulation in the rear in the smaller wake.
So my question is: What gives rise to the pressure in the rear, when there is an "annealed" or "healed" flow (when the dimples on the golf ball make the wake smaller).
Where is the higher pressure coming from in the rear to match the pressure at the front end?
(I am not asking about the dimples on golf balls. I am only asking why the pressure goes up in the rear. Yes, I know there is a smaller wake but that does not explain why the pressure goes up.)
When there is turbulence, and the flow separates, say on a SMOOTH ball, then in the rear, there is circulation in the wide wake. There is pressure on the front, but no pressure on the rear due to the fact that the fluid is "busy" circulating around. So there is form drag.
When there is NO turbulence (or little) and the flow does not separate as early, say on a golf ball, then there is LESS circulation in the rear in the smaller wake.
So my question is: What gives rise to the pressure in the rear, when there is an "annealed" or "healed" flow (when the dimples on the golf ball make the wake smaller).
Where is the higher pressure coming from in the rear to match the pressure at the front end?
(I am not asking about the dimples on golf balls. I am only asking why the pressure goes up in the rear. Yes, I know there is a smaller wake but that does not explain why the pressure goes up.)
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