Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number

Finite-amplitude elastic waves in viscoelastic channel flow from large to zero Reynolds number
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粘弹性河道流中雷诺数从大到零的有限振幅弹性波

DOI:
10.1017/jfm.2022.831
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发表时间:
2022
影响因子:
3.7
通讯作者:
Buza G
Buza G
中科院分区:
工程技术2区
文献类型:
--
作者:
Buza G

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利用Fene-P模型中的分支延拓,我们证明了由最近发现的粘弹性槽道流线性不稳定性(Khalid等人,J.流体力学,第915,2021,A43卷)产生的有限振幅行波基本上是亚临界的,达到比它们的产卵中性曲线低得多的Weissenberg(参数空间),因此,可以直接或间接地通过它们的不稳定性,影响远离流线性不稳定的地方所看到的动力学。讨论了与弹性湍流和弹性惯性湍流的可能联系。
Using branch continuation in the FENE-P model, we show that finite-amplitude travelling waves borne out of the recently discovered linear instability of viscoelastic channel flow (Khalid et al., J. Fluid Mech., vol. 915, 2021, A43) are substantially subcritical reaching much lower Weissenberg ( parameter space than their spawning neutral curve and, hence, can either directly, or indirectly through their instabilities, influence the dynamics seen far away from where the flow is linearly unstable. Possible connections to elastic and elasto-inertial turbulence are discussed.
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