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What is the reason for a sudden increase in drag beyond drag divergence?

What is the reason for a sudden increase in drag beyond drag divergence? Correct Answer Supersonic region on top and bottom region of the airfoil

When the Mach number is increased beyond the point of drag divergence, the drag decreases by a factor of 10 due to the formation of supersonic region in both top and bottom surfaces of the airfoil. This supersonic region is followed by a shock wave which leads to flow separation causing higher drag.

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