Question

For inviscid flows, which is correct immediately near the wall?

(a) \(\vec{V} ≠ 0\)

(b) \(\vec{V} = 0\)

(c) \(\vec{V} > 0\)

(d) \(\vec{V} \lt 0\)

This question was addressed to me by my school principal while I was bunking the class.

The question is from Boundary Conditions topic in division Boundary Conditions of Computational Fluid Dynamics

Answer 1

The correct answer is:

(b) V=0V=0

Explanation:

In the context of inviscid flow, the fluid is assumed to have no viscosity, meaning there is no frictional resistance between fluid layers. However, when considering the behavior of the fluid near a wall (such as a solid boundary), the boundary condition for velocity is typically that the velocity of the fluid at the wall must be zero. This is due to the no-slip condition, which states that at the boundary of a solid surface, the velocity of the fluid is equal to the velocity of the surface (which is typically zero for a stationary wall).

For inviscid flows, the no-slip condition still applies at the wall, meaning that:

V=0(immediately near the wall)V=0(immediately near the wall)

Thus, the correct answer is (b).