Journal
JOURNAL OF FLUID MECHANICS
Volume 607, Issue -, Pages 267-277Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112008001717
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Funding
- EPSRC [EP/E006493/1, EP/C539834/1, EP/C539842/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/C539842/1, EP/C539834/1, EP/E006493/1] Funding Source: researchfish
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We show that suitable initial disturbances to steady or long-period pulsatile flows in a straight tube with an axisymmetric 75%-occlusion stenosis can produce very large transient energy growths. The global optimal disturbances to an initially axisymmetric state found by linear analyses are three-dimensional wave packets that produce localized sinuous convective instability in extended shear layers. In pulsatile flow, initial conditions that trigger the largest disturbances are either initiated at, or advect to, the separating shear layer at the stenosis in phase with peak systolic flow. Movies are available with the online version of the paper.
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