01284nam a2200145 a 450000500170000000800400001710000240005724500930008126400160017433600090019033800200019952008070021950600460102685600660107220260901030407.0250101s2020    xx     o     000 0 eng d1 aAnna-Karin Tornberg10aAccurate evaluation of integrals in slender-body formulations for fibers in viscous flow 1barXivc2020  atext  aonline resource  aA non-local slender body approximation for slender flexible fibers in Stokes flow can be derived, yielding an integral equation along the center lines of the fibers that involves a slenderness parameter. The formulation contains a so-called finite part singular integral, and can in the case of several fibers or evaluation of the flow field require the evaluation of nearly singular integrals. We introduce a numerical technique to accurately and efficiently evaluate the finite part integral. This technique can be applied combined with any panel based quadrature rule and will add no additional cost except for a small precomputation of modified quadrature weights. We also show how a related technique that was recently introduced can be applied for the evaluation of the nearly singular integrals.0 aOpen access — freely available to read.40uhttps://arxiv.org/pdf/2012.12585v1yRead the full paper (PDF)