Stability of plane-parallel and two-dimensional flows over porous medium

Authors

DOI:

https://doi.org/10.17072/1994-3598-2019-1-52-59

Keywords:

coupled flows, porous medium, flow stability

Abstract

The paper presents a comparative study of linear stability problems for the plane-parallel and two-dimensional stationary flow in double layer system of fluid and porous medium. An incompressible fluid flows over homogeneous saturated porous layer. The fluid top is a free rigid boundary. Porous medium is described by the Brinkman model. Two-dimensional stationary solutions are built numerically by iterative procedure of establishment method. Sets of the neutral curves are obtained by the shooting method; perturbations are assumed to be flat linear waves travelling down the flow. The neutral curves are compared for plane-parallel and two-dimensional stationary flow for different porosity and thickness of porous layer. The critical Reynolds numbers are almost twice larger than the stability threshold of plane parallel problem while the critical wave numbers close these two cases. If the porous layer is thick, the two-dimensional problem rapidly destabilized. Its stability threshold becomes lower that for plane-parallel flow. The long-wave instability realizes. Critical wave numbers are small and tends to zero at high porosities. The neutral curve become bimodal at low porosity.

Author Biography

Кирилл Борисович Циберкин (Kirill Tsiberkin), Perm State University

кандидат физико-математических наук, без звания кафедра теоретической физики, доцент

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Published

2019-05-24

How to Cite

Циберкин (Kirill Tsiberkin) К. Б. (2019). Stability of plane-parallel and two-dimensional flows over porous medium. Bulletin of Perm University. Physics, (1). https://doi.org/10.17072/1994-3598-2019-1-52-59

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Regular articles

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