[MBDyn-users] How to handle air drag force?
Hughe
efx.ninenineone at gmail.com
Sat Oct 8 08:56:36 CEST 2011
Hi all,
I plan to run a numerical analysis of a simple pendulum.
The shape of bob is major factor that would affect the T (period)
variation.
I assume the shape of bob is a round sphere. I have the following
formula that explains
how the pendulum looses movement.
Fp - Fk - Fd
Fp: Inital Pendulum force which comes from the height of pendulum at
initial time t0.
Fk: Kinetic frictional force
Fd: Drag force of pendulum bob
To get air drag force, I use
Fd = 0.5 x C x density x A x (v^2)
C: drag coefficient: 0.4 to 1.0
A: cross sectional area
density: air density
v: speed of the pendulum bob
Should I look into the relationship between C and A and calculate Fd?
or
MBDyn has built-in feature to handle C and A?
Thanks in advance,
Hughe
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