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Large-Eddy Simulation of physiological pulsatile non-newtonian flow in a channel with double constriction

Molla, Md. Mamun, Wang, Bing-Chen, & Saha, Suvash C. (2010) Large-Eddy Simulation of physiological pulsatile non-newtonian flow in a channel with double constriction. In Proceedings of the 13th Asian Congress of Fluid Mechanics, Engineers Institute of Bangladesh, Dhaka, Bangladesh, pp. 1084-1088.

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Abstract

Physiological pulsatile flow in a 3D model of arterial double stenosis, using the modified Power-law blood viscosity model, is investigated by applying Large Eddy Simulation (LES) technique. The computational domain has been chosen is a simple channel with biological type stenoses. The physiological pulsation is generated at the inlet of the model using the first four harmonics of the Fourier series of the physiological pressure pulse. In LES, a top-hat spatial grid-filter is applied to the Navier-Stokes equations of motion to separate the large scale flows from the subgrid scale (SGS). The large scale flows are then resolved fully while the unresolved SGS motions are modelled using the localized dynamic model. The flow Reynolds numbers which are typical of those found in human large artery are chosen in the present work. Transitions to turbulent of the pulsatile non-Newtonian along with Newtonian flow in the post stenosis are examined through the mean velocity, wall shear stress, mean streamlines as well as turbulent kinetic energy and explained physically along with the relevant medical concerns.

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ID Code: 44170
Item Type: Conference Paper
Keywords: Stenosed channel, LES, Physiological non-Newtonian flow, Turbulent flow
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Numerical Modelling and Mechanical Characterisation (091307)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2010 (please consult the authors).
Deposited On: 24 Aug 2011 10:21
Last Modified: 03 Apr 2013 02:16

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