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What is the shortcoming of analysing flow properties using quasi-one-dimensional analysis?

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What is the shortcoming of analysing flow properties using quasi-one-dimensional analysis?

(a) Time consuming

(b) Inaccurate

(c) No information on wall contours of nozzle

(d) Unable to predict all the flow properties

I got this question during an online interview.

This question is from Supersonic Nozzle Design in section Numerical Techniques for Nonlinear Supersonic Flow, Elements of Hypersonic Flow, Couette and Poiseuille Flow of Aerodynamics

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Best answer
Right choice is (c) No information on wall contours of nozzle

The best explanation: Flow properties at any section of the nozzle can be predicted by the quasi-one-dimensional analysis. It represents the average flow quantities. There are two major shortcomings of using this analysis. First being that it does not predict the three-dimensional flow in convergent-divergent nozzle and secondly, it does not provide us with the information of wall contours in the nozzle.

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