Numerical study of an inextensible, finite swimmer in Stokesian viscoelastic flow
Numerical study of an inextensible, finite swimmer in Stokesian viscoelastic flow
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斯托克斯粘弹性流中不可扩展的有限游泳者的数值研究
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
Héctor D. Ceniceros
中科院分区：
文献类型：
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作者：
Daniel Salazar;A. M. Roma;Héctor D. Ceniceros
本文对Stokesian Oldrophil-B流中有效不可伸展的有限游泳者的浸没边界模型进行了数值研究。游泳者模型是一个有限范围的二维片，其步态由弹性力产生，该弹性力惩罚与目标形状的偏差。一个非刚性IB方法被用来消除阻碍时间步长的限制引起的强大的切向力的游泳者。结果发现，对于一个游泳运动员与规定的步态，其平均推进速度随着德博拉数De的增加，朝着一个明显的渐近最小值。然而，随着游泳者被允许偏离目标形状更多，具有De的单调运动行为被打破。对于一个足够灵活的游泳者，粘弹性可以增强运动，但在粘弹性流体中的游泳者总是保持比在牛顿流体中推进时慢。值得注意的是，粘弹性应力扩散的增加大大改变了游泳者的推进力。
A numerical investigation of an Immersed Boundary (IB) model of an effectively inextensible, finite swimmer in a Stokesian Oldroyd-B flow is presented. The swimmer model is a two-dimensional sheet of finite extent and its gait is generated by an elastic force which penalizes deviations from a target shape. A non-stiff IB method is employed to remove the impeding time step limitation induced by strong tangential forces on the swimmer. It is found that for a swimmer with a prescribed gait its mean propulsion speed decreases with increasing Deborah number De toward an apparent asymptotic minimal value. However, as the swimmer is allowed to deviate more from the target shape, the monotonic locomotion behavior with De is broken. For a sufficiently flexible swimmer, viscoelasticity can enhance locomotion but the swimmer in the viscoelastic fluid always remains slower than when it is propelling in a Newtonian fluid. Remarkably, the addition of viscoelastic stress diffusion dramatically alters the swimmer propuls...
生物化学和流体动力学的耦合在简单的鞭毛模型中捕获了过度活跃的精子活力。
影响因子：
2
作者：
Olson,SarahD;Suarez,SusanS;Fauci,LisaJ
通讯作者：
Fauci,LisaJ
影响因子：
8.6
作者：
Fu, Henry C.;Powers, Thomas R.;Wolgemuth, Charles W.
通讯作者：
Wolgemuth, Charles W.