Question

What is a Newtonian theory used for?

(a) Finding lift coefficient over blunt body

(b) Finding pressure coefficient over blunt body

(c) Finding drag coefficient over sharp wedge

(d) Finding pressure coefficient over cone

The question was posed to me at a job interview.

My enquiry is from Time-Marching Technique topic in section Time-Marching Technique of Aerodynamics

Answer 1

Right choice is (b) Finding pressure coefficient over blunt body

Easiest explanation: Newtonian theory was developed in order to predict the coefficient of pressure over the bluff body when there is incoming flow. It is given by the following relation:

Cp = 2sin^2θ

Where, the coefficient of pressure is given by:

Cp = \(\frac {1}{2} \frac {(p – p_∞)}{ρV^{2}}\)