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Coefficient of Pressure.
The coefficient of pressure (Cp) for the potential flow around Joukowski airfoils. On the left, the plots contain a cylinder in uniform flow. On the right, there is transformed space which produces an airfoil in uniform flow. The top plots show the coefficient of pressure distributed throughout space with red representing positive pressure coefficient (pressure above the free stream pressure) and blue representing negative pressure coefficient. On the bottom, the Cp is graphed on the surface of the airfoil using the same data set. This is done by setting the X-Y plot to display only the data where I=1. Note the Cp scales for the two airfoil plots are twice that of their cylinder counterparts.
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