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THREE-LAYER FLUID FLOW OVER A SMALL OBSTRUCTION ON THE BOTTOM OF A CHANNEL

Part of: Equations of mathematical physics and other areas of application Incompressible inviscid fluids

Published online by Cambridge University Press:  20 January 2015

SRIKUMAR PANDA ,
S. C. MARTHA  and
A. CHAKRABARTI
SRIKUMAR PANDA
Affiliation:
Department of Mathematics, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India email [email protected], [email protected]
S. C. MARTHA*
Affiliation:
Department of Mathematics, Indian Institute of Technology Ropar, Rupnagar 140001, Punjab, India email [email protected], [email protected]
A. CHAKRABARTI
Affiliation:
Department of Mathematics, Indian Institute of Science, Bangalore 560012, India email [email protected]
*
✉[email protected]
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Abstract

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Many boundary value problems occur in a natural way while studying fluid flow problems in a channel. The solutions of two such boundary value problems are obtained and analysed in the context of flow problems involving three layers of fluids of different constant densities in a channel, associated with an impermeable bottom that has a small undulation. The top surface of the channel is either bounded by a rigid lid or free to the atmosphere. The fluid in each layer is assumed to be inviscid and incompressible, and the flow is irrotational and two-dimensional. Only waves that are stationary with respect to the bottom profile are considered in this paper. The effect of surface tension is neglected. In the process of obtaining solutions for both the problems, regular perturbation analysis along with a Fourier transform technique is employed to derive the first-order corrections of some important physical quantities. Two types of bottom topography, such as concave and convex, are considered to derive the profiles of the interfaces. We observe that the profiles are oscillatory in nature, representing waves of variable amplitude with distinct wave numbers propagating downstream and with no wave upstream. The observations are presented in tabular and graphical forms.

Keywords

linear theorythree-layer irrotational flowperturbation analysisFourier transformationconcave and convex bottom profiles

MSC classification

Primary: 35Q35: PDEs in connection with fluid mechanics
Secondary: 76B07: Free-surface potential flows
Type
Research Article
Information
The ANZIAM Journal , Volume 56 , Issue 3 , January 2015 , pp. 248 - 274
Copyright
© 2015 Australian Mathematical Society 

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