1.

Which of these is true for an impermeable wall?

A. \(\vec{V}=0\) above the surface
B. \(\vec{V}=0\) at the surface
C. \(\vec{V}.\vec{n}=0\) at the surface
D. \(\vec{V}.\vec{n}=0\) above the surface
Answer» D. \(\vec{V}.\vec{n}=0\) above the surface


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