Question

What is magnus effect?how the circulation orginate around an air foil?

Answer 1

The Magnus effect, depicted with a backspinning cylinder or ball in an airstream. The arrow represents the resulting lifting force. The curly flow lines represent a turbulent wake. The airflow has been deflected in the direction of spin.

Answer 2

When a ball or other spherical object move in air with some velocity then it goes in straight line if ball is moving in straight line but also rotate on its axis like spin then the ball will follow curly path that curly motion is due to unequal air pressure on two sides of ball when it is moving that is called the Magnus effect. For example, when footballer kick ball sometimes it follows curved or distorted path when ball is in both spin and straight motion.