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What is the need of constructing a model for analysing fluids?

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What is the need of constructing a model for analysing fluids?

(a) Fluids are not stationary but they have the same velocity in different parts

(b) Fluids are stationary and they have the same velocity in different parts

(c) Fluids are not stationary and they have different velocities in different parts

(d) Fluids are not stationary but they have the same velocity in different parts

I have been asked this question in my homework.

I want to ask this question from Governing Equations in division Governing Equations of Fluid Dynamics of Computational Fluid Dynamics

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The correct choice is (c) Fluids are not stationary and they have different velocities in different parts

Easiest explanation: A solid body can be easily divided into different parts. A fluid is squishy and it has different velocities in different parts. This creates the need for a model to analyse it.

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