Large Eddy Simulation of Pulsatile Flow through a Channel with Double ConstrictionReport as inadecuate


Large Eddy Simulation of Pulsatile Flow through a Channel with Double Constriction


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1

Department of Mathematics and Physics, North South University, Dhaka-1229, Bangladesh

2

School of Engineering, University of Glasgow, Glasgow G12 8QQ, UK





*

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Academic Editor: Mehrdad Massoudi

Abstract Pulsatile flow in a 3D model of arterial double stenoses is investigated using a large eddy simulation LES technique. The computational domain that has been chosen is a simple channel with a biological-type stenosis formed eccentrically on the top wall. The pulsation was generated at the inlet using the first four harmonics of the Fourier series of the pressure pulse. The flow Reynolds numbers, which are typically suitable for a large human artery, are chosen in the present work. 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 sub-grid scale SGS. The large-scale flows are then resolved fully while the unresolved SGS motions are modelled using a localized dynamic model. It is found that the narrowing of the channel causes the pulsatile flow to undergo a transition to a turbulent condition in the downstream region; as a consequence, a severe level of turbulent fluctuations is achieved in these zones. Transitions to turbulent of the pulsatile flow in the post stenosis are examined through the various numerical results, such as velocity, streamlines, wall pressure, shear stresses and root mean square turbulent fluctuations. View Full-Text

Keywords: pulsatile flow; double constricted channel; large eddy simulation; Cartesian curvilinear coordinates; finite volume method pulsatile flow; double constricted channel; large eddy simulation; Cartesian curvilinear coordinates; finite volume method





Author: Md. Mamun Molla 1,* and Manosh C. Paul 2

Source: http://mdpi.com/



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