Antony Hill's Outputs (47)

The influence of a fluid-porous interface on solar pond stability (2013)
Journal Article

The linear instability of the gradient zone of a solar pond containing a fluid-porous interface is investigated. It is found that the gradient zone can retain the same stability for lower values of the solute Rayleigh number with the introduction of... Read More about The influence of a fluid-porous interface on solar pond stability.

Stability of double-diffusive convection induced by selective absorption of radiation in a fluid layer (2012)
Journal Article

Linear and nonlinear stability analyses were performed on a fluid layer with a concentration-based internal heat source. Clear bimodal behaviour in the neutral curve (with stationary and oscillatory modes) is observed in the region of the onset of os... Read More about Stability of double-diffusive convection induced by selective absorption of radiation in a fluid layer.

Double diffusive convection in a viscoelastic fluid-saturated porous layer using a thermal non-equilibrium model (2012)
Journal Article

The stability of a binary viscoelastic fluid-saturated porous layer which is heated from below is studied, where the fluid and solid phases are not in local thermal equilibrium. The modified Darcy-Oldroyd model is employed as a momentum equation, wit... Read More about Double diffusive convection in a viscoelastic fluid-saturated porous layer using a thermal non-equilibrium model.

An operative method to obtain sharp nonlinear stability for systems with spatially dependent coefficients (2012)
Journal Article

This paper explores an operative technique for deriving nonlinear stability by studying double-diffusive porous convection with a concentration-based internal heat source. Previous stability analyses on this problem have yielded regions of potential... Read More about An operative method to obtain sharp nonlinear stability for systems with spatially dependent coefficients.

Stability of double-diffusive convection induced by selective absorption of radiation in a fluid layer (2012)
Journal Article

Linear and nonlinear stability analyses were performed on a fluid layer with a concentration-based internal heat source. Clear bimodal behaviour in the neutral curve (with stationary and oscillatory modes) is observed in the region of the onset of os... Read More about Stability of double-diffusive convection induced by selective absorption of radiation in a fluid layer.

Double-diffusive penetrative convection simulated via internal heating in an anisotropic porous layer with throughflow (2011)
Journal Article

A model for double-diffusive convection in an anisotropic porous layer with a constant throughflow is explored, with penetrative convection being simulated via an internal heat source. Both linear instability and nonlinear stability analyses are perf... Read More about Double-diffusive penetrative convection simulated via internal heating in an anisotropic porous layer with throughflow.

Penetrative convection in anisotropic porous media with variable permeability (2011)
Journal Article

The onset of penetrative convection in an anisotropic porous medium, for fluids with quadratic density law, is studied. In particular, the effects of anisotropic permeability and thermal diffusivity have been taken into account. © 2010 Springer-Verla... Read More about Penetrative convection in anisotropic porous media with variable permeability.

Nonlinear stability of the one-domain approach to modelling convection in superposed fluid and porous layers (2010)
Presentation / Conference Contribution

Studies of the nonlinear stability of fluid/porous systems have been developed very recently. A two-domain modelling approach has been adopted in previous works, but was restricted to specific configurations. The extension to the more general case of... Read More about Nonlinear stability of the one-domain approach to modelling convection in superposed fluid and porous layers.

Penetrative convection via internal heating in anisotropic porous media (2010)
Journal Article

Penetrative convection in an anisotropic porous medium is simulated via internal heating. We consider both internal heat sources and sinks, where the porous medium has constant anisotropic thermal diffusivity and non-homogeneous permeability. Both li... Read More about Penetrative convection via internal heating in anisotropic porous media.

Sharp global nonlinear stability for a fluid overlying a highly porous material (2010)
Journal Article

The stability of convection in a two-layer system in which a layer of fluid with a temperature-dependent viscosity overlies and saturates a highly porous material is studied. Owing to the difficulties associated with incorporating the nonlinear advec... Read More about Sharp global nonlinear stability for a fluid overlying a highly porous material.

Poiseuille flow in a fluid overlying a highly porous material (2009)
Journal Article

This paper investigates the instability of Poiseuille flow in a fluid overlying a highly porous material. A two layer approach is adopted, where the Darcy-Brinkman equation is employed to describe the fluid flow in the porous medium, with a tangentia... Read More about Poiseuille flow in a fluid overlying a highly porous material.

Instability of Poiseuille flow in a fluid overlying a glass bead packed porous layer (2009)
Journal Article

The instability of Poiseuille flow in a fluid overlying a glass bead packed porous layer saturated with the same fluid is studied. A three layer configuration is adopted, where a variable effective viscosity is modelled between the outer fluid and po... Read More about Instability of Poiseuille flow in a fluid overlying a glass bead packed porous layer.

A differential constraint approach to obtain global stability for radiation-induced double-diffusive convection in a porous medium (2009)
Journal Article

The stability of double-diffusive porous convection with a concentration-based internal heat source is studied. Owing to the significant sensitivity of standard energy method, a highly desirable reduction in the number of required coupling parameters... Read More about A differential constraint approach to obtain global stability for radiation-induced double-diffusive convection in a porous medium.

Anisotropy and symmetry in porous media convection (2009)
Journal Article

The linear and nonlinear stability analysis of the motionless state (conduction solution) and of a vertical throughflow in an anisotropic porous medium is performed. In particular, the effect of a nonhomogeneous porosity and a constant anisotropic th... Read More about Anisotropy and symmetry in porous media convection.

Global stability for thermal convection in a fluid overlying a highly porous material (2009)
Journal Article

This paper investigates the instability thresholds and global nonlinear stability bounds for thermal convection in a fluid overlying a highly porous material. A two-layer approach is adopted, where the Darcy-Brinkman equation is employed to describe... Read More about Global stability for thermal convection in a fluid overlying a highly porous material.

Penetrative convection in a fluid layer with throughflow (2008)
Journal Article

Linear and nonlinear stability analyses of vertical throughflow in a fluid layer, where the density is quadratic in temperature, are studied. To avoid the loss of key terms a weighted functional is used in the energy analysis. Both conditional and un... Read More about Penetrative convection in a fluid layer with throughflow.

Global stability for penetrative double-diffusive convection in a porous medium (2008)
Journal Article

Linear and nonlinear stability analyses of penetrative double-diffusive convection in a porous medium are performed. Adopting a standard energy method approach yields a nonlinear threshold which is independent of the salt field. An adaptation of a ne... Read More about Global stability for penetrative double-diffusive convection in a porous medium.

Poiseuille flow in a fluid overlying a porous medium (2008)
Journal Article

This paper numerically investigates the instability of Poiseuille flow in a fluid overlying a porous medium saturated with the same fluid. A three-layer configuration is adopted. Namely, a Newtonian fluid overlying a Brinkman porous transition layer,... Read More about Poiseuille flow in a fluid overlying a porous medium.

Unconditional nonlinear stability for convection in a porous medium with vertical throughflow (2007)
Journal Article

Linear and nonlinear stability analyses of vertical throughflow in a fluid saturated porous layer, which is modelled using a cubic Forchheimer model, are studied. To ensure unconditional nonlinear results are obtainable, and to avoid the loss of key... Read More about Unconditional nonlinear stability for convection in a porous medium with vertical throughflow.

Global stability for penetrative convection with throughflow in a porous material (2007)
Journal Article

This paper investigates penetrative convection in a layer of porous material saturated with water when there is throughflow present. The density is quadratic in temperature. A linearized instability analysis is derived and compared with a weighted no... Read More about Global stability for penetrative convection with throughflow in a porous material.