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For the incompressible flows, which of these terms will be zero?

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For the incompressible flows, which of these terms will be zero?

(a) Pressure force

(b) Body force

(c) Bulk viscosity

(d) Shear force

I have been asked this question in class test.

This key question is from Incompressible Flows in chapter Incompressible Flows & Compressible Flows of Computational Fluid Dynamics

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The correct choice is (c) Bulk viscosity

To explain: A part of the viscous terms in the momentum equation is present in the diffusive term. Among these comes the bulk viscosity terms. These terms will be non-zero only for the compressible flows.

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