Which of these distributions is required in the wake region of the lifting body?

Sink

Source

Dipole

Doublet

Correct Answer : Dipole

Explanation : Lifting bodies have a trailing edge which leads to a wake region. In the wake region, there is formation of vortices due to the disturbances in the flow. In this region, a dipole or vorticity singularity is used.

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Who developed the panel method?

Ludwig Pradtl

Hess and Smith

Karl Wieghardt

Theodore Von Karman

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.

Which of these flows can be modelled by the panel method?

Rotational flow

Supersonic flow

Compressible flow

Incompressible flow

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.

Is large eddy simulation will occur for both subcritical and supercritical solution?

True

False

Can Not Say

None of the above

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.