![]() ![]() Only a few studies have observed the reverse Magnus effect due to the small range of speed and spin rate where it occurs. The laminar flow on the top surface moves the separation point forward, changing the direction of the Magnus effect downward, producing the reverse Magnus effect. When the ball is traveling near the speed where the boundary layer becomes turbulent, backspin can cause the top side of the ball to have laminar flow, while the bottom boundary layer is turbulent, as shown in Fig. įor specific conditions, one study has shown a negative lift force on a sphere with backspin, referred to as the reverse Magnus effect. The rotated stagnation points (relative to the ball center) cause a vertical pressure gradient, producing an upward force and the Magnus effect. Backspin causes flow on the top side to separate further from the stagnation point, while flow on the bottom side separates closer to the stagnation point (Fig. The relative air to ball surface speed on the top and bottom of the ball is, therefore, lower and higher than the ball speed, respectively. With backspin, the top of the ball is moving with the air flow, while the bottom of the ball is moving against the air flow. Where ω is the angular velocity, and r is the ball radius. ![]()
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