Normal swing occurs mostly when the ball is fairly new. As it wears more, the aerodynamics of the asymmetry changes and it is more difficult to extract a large amount of swing. When the ball becomes very old – around 50 or more overs old – it begins to swing towards the shine. It is mainly helpful for bowlers in Test matches. This is known as reverse swing, meaning that a natural outswinger will become an inswinger and vice versa.[5] In essence, both sides of a cricket ball have turbulent flow, but in reverse swing, the seam causes the airflow to separate earlier on one side. The side of the ball that has been shined experiences quicker airflow, while on the other side, the rougher surface disrupts the airflow, slowing that side of the ball down. This causes the ball to swing either outwards or inwards, depending on how it has been released from the hand when bowled, with the ball moving towards the side on which the ball is shined.
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