Because of the fiber motion and the die slot angle, the air drag force can be divided into the parallel drag force [F.sub.f] (friction drag) and the normal drag force [F.sub.p] (pressure drag
[5.] Pankajakshan, R., Hilbert, C.B., and Whitfield, D.L., "Passive Devices for Reducing Base Pressure Drag
in Class 8 Trucks," Lect.
Most automotive aerodynamic drag is due to the pressure drag
caused by the low-pressure zone in the rear wake, and the induced drag resulting from the rear vortex .
The constant terms in [xi] and [eta] represent the losses coming from the pressure drag
. The Reynolds number is a function of the effective share length calculated from equation
Substituting the analytical solutions (20) into this definition, the pressure drag
and the frictional drag are, respectively, obtained as
When the follower AUV is located in tandem in the wake of the leader AUV, a certain amount of pressure is recovered on the tail of the leader AUV, which contributes to the reduction of the pressure drag
of the leader AUV, while for the follower AUV, the velocity of the upstream flow is reduced by the leader AUV, resulting in a reduction of the nose pressure and a decrease in final resistance.
Moreover, pressure drag
is far more than resistance drag in "Samand".
For a tunalike robot, the main resistive force is associated with the pressure drag
while the main thrust force is associated with the lift force 12].
Although the skin friction acting on the turbulent ball is higher than that of a laminar one, the form or pressure drag
resulting from the wake represents the bigger contribution to the overall drag.
According to the observed actions that occur during filter feeding, the expansive mouth cavity (see Figure 1) takes in such massive quantities of water that the combined weight and pressure drag
associated with this particular feeding action would render most fish in complete disequilibrium (causing a nose dive).
The only reason of it is the pressure drag