|
[Sponsors] |
March 8, 2002, 09:52 |
Form vs. Friction drag
|
#1 |
Guest
Posts: n/a
|
The current regulation on boat roughness means that you can't put excessive roughness on the hull of a racing boat, similar to the dimpling used on golf balls, however should the hull be as rough as possible, i.e. should we leave it slightly rough or polish it to a smooth finish?
The dimensions of the boat are 30 foot long, and the profile is about 6 foot. |
|
March 8, 2002, 15:02 |
Re: Form vs. Friction drag
|
#2 |
Guest
Posts: n/a
|
In the case of the golf ball, the dimples trip turbulence, thus delaying flow separation and reducing form drag. Friction drag goes up but the benefit in pressure distribution more than offsets this.
In the case of a ship, I would expect no separation until the stern in reached, correct? Therefore the key driver one has control over would be the friction drag, and one would want a smooth surface to maintain laminar flow as far as possible, no? I'm no sailor but there's my $0.02. |
|
March 16, 2002, 09:06 |
Thanks
|
#3 |
Guest
Posts: n/a
|
Thanks
|
|
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Pressure drag, friction drag and total drag? | Cheng | CFX | 9 | January 26, 2024 13:46 |
Drag Coefficient for Ellipse Form (2D) | Ketut Utama | Main CFD Forum | 8 | December 11, 2014 11:03 |
Form drag | mnabi | Main CFD Forum | 0 | March 5, 2011 16:58 |
nonnewtonian flow--error in friction drag values | sivakumar | FLUENT | 0 | May 18, 2005 14:19 |
Nonnewtonial flow ----error in friction drag value | sivakumar | FLUENT | 0 | May 18, 2005 14:15 |