How do you calculate wind resistance?

Answer 1

You don't. There are at least 4 serious problems with the whole idea:

-- If force and speed could be converted, then you'd be able to calculate how many

miles per hour a turkey you need for Thanksgiving dinner, and you might get a

traffic ticket if you drove down a quiet residential street at too many pounds.

-- Force doesn't even produce a definite speed. A push of 40 pounds against a bicycle

produces more speed than a push of 40 pounds against a school bus.

-- And the longer you keep pushing with the same force, the higher the speed goes.

-- And an object that's moving keeps moving at the same speed forever with no force

on it at all.

Answer 2

Wind pressures exerted on a structure depend on the speed of the wind as well as the interaction between the air flow and the structure. Since wind is air in motion the pressures it can exert are related to its kinetic energy. If the full kinetic energy is transformed into pressure then the resulting increase is given by the expression q = ½ ρ V².

where q is the wind pressure, ρ is the mass density and V the velocity of the air. The mass density of the air 1.292kg/m3 at 0°C or 1.204kg/m3 at 20°C.

Refer to document "CBD-34. Wind Pressures On Buildings" from NRCC (National Research Council of Canada) for more details (available on the web).

Answer 3

FD = 1/2 · ρ · v2· A · CD

Where,

FD is the drag force

CD is the drag coefficient,

ρ is the density of air

A is the cross-sectional area of the ball (a regulation Baseball has a circumference between 9 and 9.25 inches), and v is the velocity of the ball.

The drag coefficient is a function of things like surface roughness, ball speed, and spin, varying between 0.2 and 0.5 for speeds commonly occuring during game play, but if you'd like to ballpark it (pardon the pun), 0.3 is a good number to use.

Answer 4

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