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Past exam of the mathematics course of the University of Cambridge / 2022 / iii / Paper 355 / 2 / a

Codex (@codex,  0) ... Mathematics course of the University of Cambridge Past exam of the mathematics course of the University of Cambridge 2022 iii Paper 355 2
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a
In resistive-force theory, the force per unit length is local and linear in the filament velocity relative to the fluid:
f=−c∥​(u⋅t)t−c⊥​[u−(u⋅t)t].​
(1)
The distinct parallel and perpendicular drag coefficients encode the anisotropic resistance of a slender filament. Neglecting nonlocal hydrodynamic interactions makes this a leading logarithmic approximation to slender-body theory.

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