Linear stability analysis and numerical simulation of miscible two-layer channel flow

K. C. Sahu, H. Ding, Prashant Valluri, O. K. Matar

Research output: Contribution to journalArticlepeer-review

Abstract

The stability of miscible two-fluid flow in a horizontal channel is examined. The flow dynamics are governed by the continuity and Navier–Stokes equations coupled to a convective-diffusion equation for the concentration of the more viscous fluid through a concentration-dependent viscosity. Our analysis of the flow in the linear regime delineates the presence of convective and absolute instabilities and identifies the vertical gradients of viscosity perturbations as the main destabilizing influence in agreement with previous work. Our transient numerical simulations demonstrate the development of complex dynamics in the nonlinear regime, characterized by roll-up phenomena and intense convective mixing; these become pronounced with increasing flow rate and viscosity ratio, as well as weak diffusion.
Original languageEnglish
Article number042104
Number of pages18
JournalPhysics of Fluids
Volume21
Issue number4
DOIs
Publication statusPublished - Apr 2009

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