Journal
JOURNAL OF FLUID MECHANICS
Volume 790, Issue -, Pages -Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/jfm.2016.6
Keywords
biological fluid dynamics; blood flow
Categories
Funding
- NIH National Heart, Lung, and Blood Institute [HL108272]
- National Science Foundation [1354541]
- 'MatComPhys' under the European Research Executive Agency [FP7-PEOPLE-2011-IEF]
- Directorate For Engineering [1354541] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys [1354541] Funding Source: National Science Foundation
Ask authors/readers for more resources
The wall shear stress (WSS) vector field provides a signature for near-wall convective transport, and can be scaled to obtain a first-order approximation of the near-wall fluid velocity. The near-wall flow field governs mass transfer problems in convection-dominated open flows with high Schmidt number, in which case a flux at the wall will lead to a thin concentration boundary layer. Such near-wall transport is of particular interest in cardiovascular flows whereby haemodynamics can initiate and progress biological events at the vessel wall. In this study we consider mass transfer processes in pulsatile blood flow of abdominal aortic aneurysms resulting from complex WSS patterns. Specifically, the Lagrangian surface transport of a species released at the vessel wall was advected in forward and backward time based on the near-wall velocity field. Exposure time and residence time measures were defined to quantify accumulation of trajectories, as well as the time required to escape the near-wall domain. The effect of diffusion and normal velocity was investigated. The trajectories induced by the WSS vector field were observed to form attracting and repelling coherent structures that delineated species distribution inside the boundary layer consistent with exposure and residence time measures. The results indicate that Lagrangian WSS structures can provide a template for near-wall transport.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available