The Navier-Stokes equations express:
A{'text': 'Conservation of mass only', 'label': 'A'}
B{'text': 'Conservation of MOMENTUM for a Newtonian viscous fluid', 'label': 'B'}
C{'text': 'Conservation of energy', 'label': 'C'}
D{'text': 'Conservation of species', 'label': 'D'}
Answer & Solution
Correct answer: B. {'text': 'Conservation of MOMENTUM for a Newtonian viscous fluid', 'label': 'B'}
N-S is the momentum equation for a Newtonian (linear stress-strain-rate) fluid. Force-per-volume balance: time rate of momentum change + advection = pressure gradient + viscous stress + body force.
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