Linear stability analysis and direct numerical simulation of two layer channel flow

Sahu, K C and Govindarajan, R and Tripathi, M (2015) Linear stability analysis and direct numerical simulation of two layer channel flow. In: 68th Annual Meeting of the APS Division of Fluid Dynamics, 22–24 November, 2015, Boston, Massachusetts.

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Abstract

We study the stability of two-fluid flow through a plane channel at Reynolds numbers of a hundred to a thousand. The two fluids have the same density but different viscosities. The fluids, when miscible, are separated from each other by a mixed layer of small but finite thickness, across which viscosity changes from that of one fluid to that of the other. When immiscible, the interface is sharp. Our study spans a range of Schmidt numbers, viscosity ratios and location and thickness of the mixed layer. Our two-dimensional linear stability results predict well the behaviour displayed by our three-dimensional direct numerical simulations at early times. In both linear and non-linear regimes, the miscible flow is more unstable than the corresponding immiscible one, and the miscible flow breaks spanwise symmetry more readily to go into three-dimensionality. We show that the miscible flow over our range of parameters is always significantly more unstable than the corresponding immiscible case.

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IITH Creators:
IITH CreatorsORCiD
Sahu, K Chttp://orcid.org/0000-0002-7357-1141
Item Type: Conference or Workshop Item (Paper)
Subjects: Chemical Engineering > Biochemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Team Library
Date Deposited: 29 Sep 2015 07:33
Last Modified: 11 Jul 2017 03:59
URI: http://raiith.iith.ac.in/id/eprint/1958
Publisher URL: https://meetings.aps.org/Meeting/DFD15/Session/R26...
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