1.

For an incompressible flow field, \(\vec V\) , which one of the following conditions must be satisfied?

A. \(\nabla \cdot \vec V = 0\)
B. \(\nabla \times \vec V = 0\)
C. \(\left( {\vec V \cdot \nabla } \right)\vec V = 0\)
D. \(\frac{{\partial \vec V}}{{\partial t}} + \left( {\vec V \cdot \nabla } \right)\vec V = 0\)
Answer» B. \(\nabla \times \vec V = 0\)


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