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What would be the major difference between aerodynamic and hydrodynamic analyses?

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in Computational Fluid Dynamics by (118k points)
What would be the major difference between aerodynamic and hydrodynamic analyses?

(a) Temperature

(b) Reynolds Number

(c) Velocity

(d) Domain

This question was posed to me during an interview for a job.

My question comes from Applications in chapter Philosophy of Computational Fluid Dynamics of Computational Fluid Dynamics

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Correct choice is (b) Reynolds Number

The explanation is: Reynolds number of the flow would be the major change as the density and viscosity of water will be higher than that of air. Therefore, while modelling a hydrodynamic flow, care should be taken.

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