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How drag is formed on the cylinder?(a) Due to viscous effect(b) Due to friction(c) Due to boundary layer(d) Due to surface layerI had been asked this question in quiz.My enquiry is from Lifting Flow over Cylinder topic in chapter Inviscid & Incompressible Flow of Aerodynamics

Answer»

Correct choice is (a) DUE to viscous effect

The explanation: Drag is due to a viscous effect, which generate a frictional shear stress at the body surface and which CAUSES the flow to separate from the surface on the BACK of the body. At the leading edge of the cylinder, a stagnation point is formed. Where the oncoming flow is brought to rest. The pressure here is EQUAL to the stagnation pressure. At the adjacent to the cylinder surface, a thin boundary layer is formed. Which causes the drag on the cylinder.



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