# Which statement is not true regarding the variables present in the viscous ﬂow problems?

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Which statement is not true regarding the variables present in the viscous ﬂow problems?

(a) Velocity components are zero on ﬁxed walls

(b) Shear stress is zero along the line of symmetry

(c) Vertical velocity component vy and horizontal stress tx must be zero along the horizontal line of symmetry

(d) Shear stress is non zero along the line of symmetry

I got this question during an interview.

This key question is from Governing Equations topic in section Flows of Viscous Incompressible Fluids of Finite Element Method

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The correct choice is (d) Shear stress is non zero along the line of symmetry

Easiest explanation: In general, the primary variables are obtained using FEM and secondary variables are calculated using the primary variables. In the viscous ﬂow, both the velocity components are zero on ﬁxed walls, and shear stress is zero along the line of symmetry. Vertical velocity component vy and horizontal stress tx must be zero along the horizontal line of symmetry and vx, ty must be zero along the vertical line of symmetry.

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