Is skin friction drag is formed due to pressure distribution?

Correct Answer : Option (B) :   Hess and Smith

Explanation : In order to model the wing section there were two methods used-Conformal mapping and Airfoil Theory. But these methods were not general and hence basic panel method was developed by Hess and Smith at the Douglas Aircraft Co. in the late 1950s and early 1960s.

Correct Answer : Option (D) :   Incompressible flow

Explanation : Panel method is idea for design analysis for only incompressible flows. It lacks the ability to model viscous flow, rotational flow w and supersonic flow. A panel method performs best when modeling fully-attached, high-reynolds-number (> 105), subsonic (Mach number < 1) flow.

Correct Answer : Option (A) :   True

Explanation : The large eddy simulation in the regions away from solid surfaces. For both the subcritical and supercritical solutions, the agreement with experimental measurements for the mean drag and pressure distribution over the sphere is adequate.