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Which of these equations are needed for compressible flows?

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Which of these equations are needed for compressible flows?

(a) Mass, momentum and energy conservations and equation of state

(b) Mass and momentum conservations and equation of state

(c) Momentum and energy conservations and equation of state

(d) Mass, momentum and energy conservations

This question was posed to me in unit test.

My doubt stems from Compressible Flows topic in section Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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Correct choice is (a) Mass, momentum and energy conservations and equation of state

To explain: For the compressible flows, the basic governing equations – the mass, momentum and energy conservations are solved first. From these known values, to find the unknowns, an extra governing equation – the equation of state is also used.

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