|June 5, 2006, 16:32||
Fluent no longer know their Drag vs. Re curves ?
What a stupid article on fluent.com main page:
Evolution of soccer ball drag at high speeds for different ball designs - 1960's to the present day â€" zero degrees orientation to oncoming flow.
At what speed? is it the same Reynold number?
This is not how you would represent drag curve for a spherical object moving in the air: it depends on the Reynold number. They showed last time that Drag can change a lot with a small change in Reynolds number:
They should plot the Drag vs Reynold number for the four balls as above, other wise it does not mean anything.
I can bet you they have all about the same curve Drag vs. Re.
The kicker just need more force for the old ball because it is heavier. The heavier ball will also keep a higher speed longer as it will be more difficult for the air to stop it once in flight.
Also I'd rather belive the streamline there: http://www.fluent.com/news/pr/pr43.htm than there: http://www.fluent.com/news/pr/pr132.htm
What do you think?
|May 3, 2010, 12:43||
Join Date: Mar 2010
Posts: 27Rep Power: 7
The links don't work
|Thread||Thread Starter||Forum||Replies||Last Post|
|How does FLUENT calculate lift and drag?||xTamx420||FLUENT||0||May 30, 2011 13:35|
|Abaqus - Fluent Coupling WITHOUT MPCCI||s.mishra||FLUENT||0||May 1, 2011 09:45|
|Force vectors for drag during sweeping motion||aamer||FLUENT||0||April 18, 2011 08:17|
|drag coefficient fluent||Francesco||Main CFD Forum||2||February 15, 2010 09:59|
|aerofoil lift and drag curves (with automatic excecution)||Elizabeth||FLUENT||0||February 26, 2000 12:47|