Transient growth analysis of flow through a sudden expansion in a circular pipe

2010 ◽  
Vol 22 (3) ◽  
pp. 034101 ◽  
Author(s):  
C. D. Cantwell ◽  
D. Barkley ◽  
H. M. Blackburn
Keyword(s):  
Growth Analysis ◽  
Circular Pipe ◽  
Sudden Expansion ◽  
Transient Growth ◽  
Flow Through

Convective instability in steady stenotic flow: optimal transient growth and experimental observation

2010 ◽  
Vol 655 ◽  
pp. 504-514 ◽  
Author(s):  
M. D. GRIFFITH ◽  
M. C. THOMPSON ◽  
T. LEWEKE ◽  
K. HOURIGAN
Keyword(s):  
Experimental Observation ◽  
Convective Instability ◽  
Growth Analysis ◽  
Optimal Growth ◽  
Reynolds Numbers ◽  
Bypass Transition ◽  
Transient Growth ◽  
Shear Layer Instability ◽  
Chaotic Region ◽  
Flow Through

An optimal transient growth analysis is compared with experimental observation for the steady flow through an abrupt, axisymmetric stenosis of varying stenosis degree. Across the stenosis range, a localized sinuous convective shear-layer instability type is predicted to dominate. A comparison of the shape and development of the optimal modes is made with experimental dye visualizations. The presence of the same sinuous-type disturbance immediately upstream of the highly chaotic region observed in the experimental flow is consistent with the optimal growth predictions. This, together with the fact that the flow is unstable globally only at much higher Reynolds numbers, suggests bypass transition.

A new mechanism for periodic bursting of the recirculation region in the flow through a sudden expansion in a circular pipe

2018 ◽  
Vol 30 (3) ◽  
pp. 031701 ◽  
Author(s):  
Benoit Lebon ◽  
Minh Quan Nguyen ◽  
Jorge Peixinho ◽  
Mostafa Safdari Shadloo ◽  
Abdellah Hadjadj
Keyword(s):  
Circular Pipe ◽  
Sudden Expansion ◽  
Recirculation Region ◽  
Flow Through

Bifurcation phenomena in the flow through a sudden expansion in a circular pipe

2009 ◽  
Vol 21 (1) ◽  
pp. 014110 ◽  
Author(s):  
T. Mullin ◽  
J. R. T. Seddon ◽  
M. D. Mantle ◽  
A. J. Sederman
Keyword(s):  
Circular Pipe ◽  
Sudden Expansion ◽  
Bifurcation Phenomena ◽  
Flow Through

Biphasic co-flow through a sudden expansion or contraction of a Hele-Shaw channel

2021 ◽  
Vol 6 (7) ◽  
Author(s):  
Boris Y. Rubinstein ◽  
Dana Zusmanovich ◽  
Zhenzhen Li ◽  
Alexander M. Leshansky
Keyword(s):  
Sudden Expansion ◽  
Flow Through

Bifurcation analysis of two-dimensional laminar flow through sudden expansion channel

2022 ◽  
Vol 13 (1) ◽  
pp. 0-0
Keyword(s):  
Laminar Flow ◽  
Expansion Ratio ◽  
Sudden Expansion ◽  
Two Dimensional ◽  
Governing Equations ◽  
Bifurcation Phenomena ◽  
Different Types ◽  
Fluent Software ◽  
Flow Through ◽  
Volume Method

In this work, bifurcation characteristics of unsteady, viscous, Newtonian laminar flow in two-dimensional sudden expansion and sudden contraction-expansion channels have been studied for different values of expansion ratio. The governing equations have been solved using finite volume method and FLUENT software has been employed to visualize the simulation results. Three different mesh studies have been performed to calculate critical Reynolds number (Recr) for different types of bifurcation phenomena. It is found that Recr decreases with the increase in expansion ratio (ER).

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