# Registered Data

Contents

- 1 [CT143]
- 1.1 [02405] STABILITY OF NON-ISOTHERMAL POISEUILLE FLOW IN FLUID OVERLYING POROUS DOMAIN
- 1.2 [00826] Saffman-Taylor fingers selection mechanism in non-newtonian fluids
- 1.3 [02409] Effect of Permeability on Couette Flow in Fluid-Porous System
- 1.4 [01033] Convective instabilities in vertical porous media

# [CT143]

**Session Time & Room****Classification**- CT143 (1/1) : Hydrodynamic stability (
__76E__)

## [02405] STABILITY OF NON-ISOTHERMAL POISEUILLE FLOW IN FLUID OVERLYING POROUS DOMAIN

**Session Time & Room**:__5C__(Aug.25, 13:20-15:00) @__D101__**Type**: Contributed Talk**Abstract**: The linear stability analysis of thermal convection of Poiseuille flow in an anisotropic and inhomogeneous porous domain underlying fluid domain is investigated. The impact of depth ratio, anisotropy, inhomogeneity, Darcy number, Reynolds number and Prandtl number is inspected. An increase((decrease)) in anisotropy((inhomogeneity)) parameter follows unimodal((porous)) to bimodal((fluid and porous)) characteristic of neutral curves. Energy budget analysis is carried out to classify type of instability. Secondary flow patterns are analysed to validate the least stable mode.**Classification**:__76E17__,__76E06__,__76T99__,__80A19__,__76S05__**Format**: Talk at Waseda University**Author(s)**:**Anjali Anjali**(Department of Mathematics, Indian Institute of Technology Roorkee)- Premananda Bera (Department of Mathematics, Indian Institute of Technology Roorkee)
- Arshan Khan (Department of Mathematics, Indian Institute of Technology Roorkee)

## [00826] Saffman-Taylor fingers selection mechanism in non-newtonian fluids

**Session Time & Room**:__5C__(Aug.25, 13:20-15:00) @__D101__**Type**: Contributed Talk**Abstract**: We present an analytical approach, based on the Wentzel-Kramers-Brillouin technique, to predict the finger width of a simple fluid driving a non-Newtonian, power-law fluid. We find that in the limit of small surface tension, (\nu), the relation between the dimensionless (\nu), viscosity and finger width, (\Lambda), has the form: (\Lambda \sim \frac{1}{2} - \mathrm{O}(\nu ^ {-1/2})) for shear thinning case, and (\Lambda \sim \frac{1}{2} + \mathrm{O}(\nu^{2/(4-n)})) for shear thickening case. A detailed comparison is provided.**Classification**:__76E17__**Format**: Talk at Waseda University**Author(s)**:**Diksha Bansal**(IIIT Delhi)

## [02409] Effect of Permeability on Couette Flow in Fluid-Porous System

**Session Time & Room**:__5C__(Aug.25, 13:20-15:00) @__D101__**Type**: Contributed Talk**Abstract**: A horizontal fluid layer overlying a porous layer is considered in which the plane Couette flow is induced due to uniform movement of upper plate and convection arises due to maintenance of temperature difference between the upper and lower plate. Fluid considered is Newtonian and incompressible which satisfies Boussinesq approximation. The porous layer is modelled by Darcy's law. The classical linear stability analysis is implemented to study the impact of media permeability for heavy oils.**Classification**:__76E06__,__76E17__,__76T99__,__76F10__,__76S05__**Format**: Talk at Waseda University**Author(s)**:**Nandita Barman**(Department of Mathematics)- Premananda Bera (Department of Mathematics)

## [01033] Convective instabilities in vertical porous media

**Session Time & Room**:__5C__(Aug.25, 13:20-15:00) @__D101__**Type**: Contributed Talk**Abstract**: Stability of natural convection in vertical porous slabs is of significant importance due to its applications in several natural and industrial settings – building insulation involving an unventilated air gap and for breathing walls is one of them. In this talk, we will discuss natural convection in a vertical porous slab with a differential temperature between the vertical walls. We show that a temperature-dependent thermal diffusivity/dynamic viscosity plays an important on the convective stability.**Classification**:__76E06__,__76S99__,__76R50__**Format**: Talk at Waseda University**Author(s)**:**Satyajit Pramanik**(Indian Institute of Technology Guwahati)