Outputs (21)

A study of extreme water waves using a hierarchy of models based on potential-flow theory (2024)
Journal Article
Choi, J., Kalogirou, A., Lu, Y., Bokhove, O., & Kelmanson, M. (2024). A study of extreme water waves using a hierarchy of models based on potential-flow theory. Water Waves, 6, 225-277. https://doi.org/10.1007/s42286-024-00084-4

The formation of extreme waves arising from the interaction of three line-solitons with equal far-field amplitudes is examined through a hierarchy of water-wave models. The Kadomtsev–Petviashvili equation (KPE) is first used to prove analytically tha... Read More about A study of extreme water waves using a hierarchy of models based on potential-flow theory.

Nonlinear dynamics of unstably stratified two-layer shear flow in a horizontal channel (2023)
Journal Article
Kalogirou, A., & Blyth, M. (2023). Nonlinear dynamics of unstably stratified two-layer shear flow in a horizontal channel. Journal of Fluid Mechanics, 955, Article A32. https://doi.org/10.1017/jfm.2022.1070

The Rayleigh-Taylor instability at the interface of two sheared fluid layers in a horizontal channel is investigated in the absence of inertia. The dynamics of the flow is described by a nonlinear lubrication equation which is solved numerically for... Read More about Nonlinear dynamics of unstably stratified two-layer shear flow in a horizontal channel.

Numerical Experiments on Extreme Waves Through Oblique–Soliton Interactions (2022)
Journal Article
Choi, J., Bokhove, O., Kalogirou, A., & Kelmanson, M. A. (2022). Numerical Experiments on Extreme Waves Through Oblique–Soliton Interactions. Water Waves, 4(2), 139–179. https://doi.org/10.1007/s42286-022-00059-3

Extreme water-wave motion is investigated analytically and numerically by considering two-soliton and three-soliton interactions on a horizontal plane. We successfully determine numerically that soliton solutions of the unidirectional Kadomtsev–Petvi... Read More about Numerical Experiments on Extreme Waves Through Oblique–Soliton Interactions.

Nonlinear dynamics of two-layer channel flow with soluble surfactant below or above the critical micelle concentration (2020)
Journal Article
Kalogirou, A., & Blyth, M. (2020). Nonlinear dynamics of two-layer channel flow with soluble surfactant below or above the critical micelle concentration. Journal of Fluid Mechanics, 900, Article A7. https://doi.org/10.1017/jfm.2020.480

© 2020 Cambridge University Press. All rights reserved. The nonlinear stability of an inertialess two-layer surfactant-laden Couette flow is considered. The two fluids are immiscible and have different thicknesses, viscosities and densities. One of t... Read More about Nonlinear dynamics of two-layer channel flow with soluble surfactant below or above the critical micelle concentration.

A novel wave-energy device with enhanced wave amplification and induction actuator (2020)
Journal Article
Bokhove, O., Kalogirou, A., Henry, D., & Thomas, G. P. (2020). A novel wave-energy device with enhanced wave amplification and induction actuator. International Marine Energy Journal, 3(1), 37-44. https://doi.org/10.36688/imej.3.37-44

© 2020, European Wave and Tidal Energy Conference. All rights reserved. A novel wave-energy device is presented. Both a preliminary proof-of-principle of a working, scaled laboratory version of the energy device is shown as well as the derivation and... Read More about A novel wave-energy device with enhanced wave amplification and induction actuator.

From bore-soliton-splash to a new wave-to-wire wave-energy model (2019)
Journal Article
Bokhove, O., Kalogirou, A., & Zweers, W. (2019). From bore-soliton-splash to a new wave-to-wire wave-energy model. Water Waves, 1(2), 217-218. https://doi.org/10.1007/s42286-019-00022-9

We explore extreme nonlinear water-wave amplification in a contraction or, analogously, wave amplification in crossing seas. The latter case can lead to extreme or rogue-wave formation at sea. First, amplification of a solitary-water-wave compound ru... Read More about From bore-soliton-splash to a new wave-to-wire wave-energy model.

Asymptotic modelling and direct numerical simulations of multilayer pressure-driven flows (2019)
Journal Article
Kalogirou, A., Cimpeanu, R., & Blyth, M. (2020). Asymptotic modelling and direct numerical simulations of multilayer pressure-driven flows. European Journal of Mechanics - B/Fluids, 80, 195-205. https://doi.org/10.1016/j.euromechflu.2019.10.011

The nonlinear dynamics of two immiscible superposed viscous fluid layers in a channel is examined using asymptotic modelling and direct numerical simulations (DNS). The flow is driven by an imposed axial pressure gradient. Working on the assumption t... Read More about Asymptotic modelling and direct numerical simulations of multilayer pressure-driven flows.

The role of soluble surfactants in the linear stability of two-layer flow in a channel (2019)
Journal Article
Kalogirou, A., & Blyth, M. G. (2019). The role of soluble surfactants in the linear stability of two-layer flow in a channel. Journal of Fluid Mechanics, 873, 18-48. https://doi.org/10.1017/jfm.2019.392

The linear stability of Couette-Poiseuille flow of two superposed fluid layers in a horizontal channel is considered. The lower fluid layer is populated with surfactants that appear either in the form of monomers or micelles and can also get adsorbed... Read More about The role of soluble surfactants in the linear stability of two-layer flow in a channel.

Nonlinear dynamics of a dispersive anisotropic Kuramoto–Sivashinsky equation in two space dimensions (2018)
Journal Article
Tomlin, R. J., Kalogirou, A., & Papageorgiou, D. T. (2018). Nonlinear dynamics of a dispersive anisotropic Kuramoto–Sivashinsky equation in two space dimensions. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 474(2211), 20170687. https://doi.org/10.1098/rspa.2017.0687

A Kuramoto–Sivashinsky equation in two space dimensions arising in thin film flows is considered on doubly periodic domains. In the absence of dispersive effects, this anisotropic equation admits chaotic solutions for sufficiently large length scales... Read More about Nonlinear dynamics of a dispersive anisotropic Kuramoto–Sivashinsky equation in two space dimensions.

Instability of two-layer film flows due to the interacting effects of surfactants, inertia, and gravity (2018)
Journal Article
Kalogirou, A. (2018). Instability of two-layer film flows due to the interacting effects of surfactants, inertia, and gravity. Physics of Fluids, 30(3), Article 030707. https://doi.org/10.1063/1.5010896

We consider a two-fluid shear flow where the interface between the two fluids is coated with an insoluble surfactant. An asymptotic model is derived in the thin-layer approximation, consisting of a set of nonlinear partial differential equations desc... Read More about Instability of two-layer film flows due to the interacting effects of surfactants, inertia, and gravity.