Reverse swing

Reverse swing is a cricket-ball movement in which an older ball, bowled at high speed, swings toward its shiny side. It differs from conventional swing, which generally moves toward the rough side.

Cricket ball: A hard, leather-covered ball used in cricket, with a raised seam around its circumference. Its seam and contrasting surface conditions shape the airflow behind reverse swing.
Cricket pitch: The rectangular playing surface between the wickets on which a cricket ball is delivered and bounces. Pitching conditions affect how an older ball behaves after its airborne swing.
Sarfraz Nawaz: A Pakistani fast bowler who played international cricket from 1969 to 1984. He is widely credited with bringing reverse swing into prominent international use.
Yorker: A cricket delivery that pitches at or near the batter’s feet, close to the popping crease. Late reverse swing can make a yorker especially difficult to judge and defend.
Conventional swing bowling: A bowling technique in which a cricket ball curves through the air, typically toward its rough side. Reverse swing sends the ball toward the shiny side rather than the usual rough side.
Turbulent flow: Fluid motion characterized by irregular fluctuations and mixing across a range of scales. The rough side of an older ball can trigger turbulence in the air flowing over it.
Imran Khan: A Pakistani cricketer who captained the national team and was one of its leading fast bowlers. He helped establish reverse swing as a defining weapon of Pakistan’s fast-bowling attack.
Fast bowling: A cricket bowling style that prioritizes high delivery speed and often generates bounce or movement. Reverse swing is most effective when generated at high pace.
Boundary-layer separation: The point at which airflow next to a surface detaches from it, forming a wake. Different separation points on the ball’s two sides create the pressure imbalance that curves its flight.
Reynolds number: A dimensionless ratio comparing inertial and viscous forces in fluid flow. It helps characterize airflow around a ball at bowling speeds.

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