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• W2971669436 abstract "This paper presents a theory to obtain the force per unit length acting on a slender filament with a non-circular cross-section moving in a fluid at low Reynolds number. Using a regular perturbation of the inner solution, we show that the force per unit length has $O(1/ln (2A))+O(unicode[STIX]{x1D6FC}/ln ^{2}(2A))$ contributions driven by the relative motion of the particle and the local fluid velocity and an $O(unicode[STIX]{x1D6FC}/(ln (2A)A))$ contribution driven by the gradient in the imposed fluid velocity. Here, the aspect ratio ( $A=l/a_{0}$ ) is defined as the ratio of the particle size ( $l$ ) to the cross-sectional dimension ( $a_{0}$ ) and $unicode[STIX]{x1D6FC}$ is the amplitude of the non-circular perturbation. Using thought experiments, we show that two-lobed and three-lobed cross-sections affect the response to relative motion and velocity gradients, respectively. A two-dimensional Stokes flow calculation is used to extend the perturbation analysis to cross-sections that deviate significantly from a circle (i.e. $unicode[STIX]{x1D6FC}sim O(1)$ ). We demonstrate the ability of our method to accurately compute the resistance to translation and rotation of a slender triaxial ellipsoid. Furthermore, we illustrate novel dynamics of straight rods in a simple shear flow that translate and rotate quasi-periodically if they have two-lobed cross-section, and rotate chaotically and translate diffusively if they have a combination of two- and three-lobed cross-sections. Finally, we show the remarkable ability of our theory to accurately predict the motion of rings, retaining great accuracy for moderate aspect ratios ( ${sim}10$ ) and cross-sections that deviate significantly from a circle, thereby making our theory a computationally inexpensive alternative to other Stokes flow solvers." @default.
• W2971669436 created "2019-09-12" @default.
• W2971669436 creator A5069221650 @default.
• W2971669436 creator A5073315517 @default.
• W2971669436 date "2019-09-02" @default.
• W2971669436 modified "2023-10-17" @default.
• W2971669436 title "Slender body theory for particles with non-circular cross-sections with application to particle dynamics in shear flows" @default.
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• W2971669436 doi "https://doi.org/10.1017/jfm.2019.625" @default.
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