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Which of these properties of the SIMPLE scheme matches with the energy equation of the compressible flows?

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Which of these properties of the SIMPLE scheme matches with the energy equation of the compressible flows?

(a) Instability

(b) Overshoots

(c) Extra equation

(d) Under-relaxation term

I got this question during an interview.

My question is taken from Compressible Flows in chapter Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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Right option is (c) Extra equation

Easiest explanation: Like the SIMPLE scheme, the energy equation of the compressible flows also needs an under-relaxation term. The overall solution of the compressible flows follows the SIMPLE family of algorithms.

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