Past exam of the mathematics course of the University of Cambridge / 2025 / ii / Paper 1 / 39D / a / Solution

The steady Stokes equations are linear and contain no inertial term. If every imposed boundary velocity and body force is reversed, then the velocity and pressure departure from any uniform reference pressure reverse sign. Thus every fluid particle retraces its path in the reversed experiment. This is the principle of kinematic reversibility.

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