標題: An immersed boundary method for simulating Newtonian vesicles in viscoelastic fluid
作者: Seol, Yunchang
Tseng, Yu-Hau
Kim, Yongsam
Lai, Ming-Chih
應用數學系
Department of Applied Mathematics
關鍵字: Viscoelasticity;Oldroyd-B fluid;Vesicle;Tank-treading;Tumbling;Immersed boundary method
公開日期: 1-Jan-2019
摘要: In this paper, a two-dimensional immersed boundary method is developed to simulate the dynamics of Newtonian vesicle in viscoelastic Oldroyd-B fluid under shear flow. The viscoelasticity effect of extra stress is well incorporated into the immersed boundary formulation using the indicator function. Our numerical methodology is first validated in comparison with theoretical results in purely Newtonian fluid, and then a series of numerical experiments is conducted to study the effects of different dimensionless parameters on the vesicle motions. Although the tank-treading (TT) motion of Newtonian vesicle in Oldroyd-B fluid under shear flow can be observed just like in Newtonian fluid, it is surprising to find that the stationary inclination angle can be negative without the transition to tumbling (TB) motion. Moreover, the inertia effect plays a significant role that is able to turn the vesicle back to positive inclination angle through TT-TB-TT transition as the Reynolds number increases. To the best of our knowledge, this is the first numerical work for the detailed investigations of Newtonian vesicle dynamics suspended in viscoelastic Oldroyd-B fluid. We believe that our numerical results can be used to motivate further studies in theory and experiments for such coupling vesicle problems. (C) 2018 Elsevier Inc. All rights reserved.
URI: http://dx.doi.org/10.1016/j.jcp.2018.10.027
http://hdl.handle.net/11536/148473
ISSN: 0021-9991
DOI: 10.1016/j.jcp.2018.10.027
期刊: JOURNAL OF COMPUTATIONAL PHYSICS
Volume: 376
起始頁: 1009
結束頁: 1027
Appears in Collections:Articles