You can calculate drag coefficient rearranging the drag equation. The three dimensional drag coefficient Cd is equal to
for 2D problems it is Cd = D/(0.5*rho*L*V^2)
The drag coefficient is a dimensionless number that engineers use to evaluate the aerodynamic performance of an object in motion for example a flying airplane. It basically quantifies the drag force or resistance of the flow on the object. As mentioned in the previous post, it is proportional to the magnitude of drag force. So a lower drag coefficient indicates the object is subject to a smaller aerodynamic or hydrodynamic drag.
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