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Surface roughness and Magnus force of a cylinder
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[QUOTE="anlon, post: 5626863, member: 609295"] $$L = \rho_\infty V_\infty \Gamma$$ Where ##\rho_\infty## and ##V_\infty## are the freestream density and velocity, respectively, and ##\Gamma## is the vortex strength over the cylinder: $$\Gamma = -\oint_C \textbf{V} \cdot \textbf{ds}$$See Anderson, [I]Fundamentals of Aerodynamics[/I], Sixth Edition, p. 269. Surface roughness does not have any influence on the Magnus effect. Now, surface roughness [I]does[/I] affect the drag coefficient; turbulent flow separates from a surface later compared to laminar flow, which is aerodynamically more desirable than a laminar boundary layer that separates more quickly. For further reading, read up on the Kutta-Joukowsky theorem. [/QUOTE]
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