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In fluid dynamics, the drag coefficient (commonly denoted as: , or ) is a dimensionless quantity that is used to quantify the drag or resistance of an object in a fluid environment, such as air or water. It is used in the drag equation in which a lower drag coefficient indicates the object will have less aerodynamic or hydrodynamic drag.
Viscosity, however results in pressure drag and it is the dominant component of drag in the case of vehicles with regions of separated flow, in which the pressure recovery is infective. The friction drag force, which is a tangential force on the aircraft surface, depends substantially on boundary layer configuration and viscosity.
20 Οκτ 2022 · Form drag, also known as pressure drag, is a significant component of aerodynamic drag in automotive design. It is caused by the motion of air around the vehicle, which leads to changes in air pressure. As the vehicle moves, the shape and frontal area of the vehicle cause the air to either compress or expand.
Aerodynamic drag, sometimes called wind resistance, is an effect which a vehicle must overcome more and more as speed increases. Drag is a form of friction, though some of the air's effect on the vehicle is due to a low pressure zone behind the vehicle, and a high pressure zone in front.
4 Μαρ 2017 · Therefore, engineers devised a non-dimensional number, called the drag coefficient (C D), which quantifies the aerodynamic sleekness of the vehicle configuration. The definition of the drag coefficient is: where D is the drag force, ρ is the air density, U is vehicle speed, and S is the frontal area. One of the nice aspects of this formula is ...
Air friction, or air drag, is an example of fluid friction. Unlike the standard model of surface friction, such friction forces are velocity dependent. The velocity dependence may be very complicated, and only special cases can be treated analytically.
The force on an object that resists its motion through a fluid is called drag. When the fluid is a gas like air, it is called aerodynamic drag or air resistance . When the fluid is a liquid like water it is called hydrodynamic drag, but never "water resistance".
