Which of the following conditions is never a boundary condition in fluid mechanics?
(A) The velocity is zero at a boundary
(B) The normal component of velocity is zero in an inviscid flow at a boundary
(C) The tangential component of velocity is zero in an inviscid flow at a boundary
(D) The pressure is zero at a boundary
(C) The tangential component of velocity is zero in an inviscid flow at a boundary
The tangential component of velocity must be tangential to the boundary at a solid boundary, but usually, if not always, in an inviscid flow it is nonzero. A porous boundary would provide a normal component of velocity to the fluid at the boundary.
The pressure is zero (gage) at a boundary if the boundary is a free surface, the atmosphere.
In a viscous flow, the fluid sticks to the boundary so it takes on the velocity of the boundary, which is usually zero.
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