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On the Evolution of Flows in Straight Circular Pipes subject to a Localized Transverse Impulsive Body Force

Title:

On the Evolution of Flows in Straight Circular Pipes subject to a Localized Transverse Impulsive Body Force

Di Labbio, Giuseppe (2015) On the Evolution of Flows in Straight Circular Pipes subject to a Localized Transverse Impulsive Body Force. Masters thesis, Concordia University.

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Abstract

In blunt traumatic aortic injury, it is highly debated whether an abrupt deceleration alone is sufficient to cause aortic rupture. Motivated by this debate, this fundamental study investigates the effects of a localized transverse impulsive body force acting on a straight circular pipe through numerical simulation for both constant and pulsatile inlet velocity profiles. Application of this impulsive force results in a transverse pressure gradient which skews counterclockwise with flow acceleration. This pressure gradient induces two counter-rotating streamwise vortices at the boundaries of the forced section with secondary flows developing in conjunction which act to restore the unforced velocity profile. The development of the secondary flow was observed to occur later for an accelerating flow and earlier for a decelerating flow. A dimensionless parameter, Ψ, was developed to characterize flows based on the ratio of transverse to streamwise pressure gradients. Lower Reynolds number flows (higher Ψ), were observed to be most readily affected by the body force. Maximum skewing of the velocity profile occurred during the impact rather than at the end except for a decelerating flow, with larger skewing occurring for higher Ψ. The temporal decay of kinetic energy was observed to be faster for larger Reynolds numbers and is governed by a power law decay. An alternating exchange in energy between the axial and secondary flows was also observed.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical and Industrial Engineering
Item Type:Thesis (Masters)
Authors:Di Labbio, Giuseppe
Institution:Concordia University
Degree Name:M.A. Sc.
Program:Mechanical Engineering
Date:29 June 2015
Thesis Supervisor(s):Kadem, Lyes
Keywords:Impact, Transverse Body Force, Pipe Flow
ID Code:980142
Deposited By: GIUSEPPE DI LABBIO
Deposited On:03 Nov 2015 15:03
Last Modified:18 Jan 2018 17:50
Additional Information:None.

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