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How is pressure calculated in a compressible flow?

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How is pressure calculated in a compressible flow?

(a) Pressure correction equation

(b) Equation of state

(c) Momentum equation

(d) Energy equation

I have been asked this question during an online exam.

I would like to ask this question from Incompressible Flows topic in portion Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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The correct option is (b) Equation of state

Explanation: In the compressible flows, the density terms of the continuity equation do not cancel out. So, density can be determined using the continuity equation. Using this density value and the equation of state, we can get the pressure values.

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