All Outputs (6)

Linear dynamics in turbulent stratified plane Poiseuille flow (2024)
Journal Article
Lloyd, C. J., & Dorrell, R. M. (2024). Linear dynamics in turbulent stratified plane Poiseuille flow. Journal of Fluid Mechanics, 999, Article A104. https://doi.org/10.1017/jfm.2024.1000

We investigate a turbulent stratified plane Poiseuille flow using linear models and nonlinear simulations. We propose the first complete explanation for the prolific and coherent backward (BWs)-and forward-propagating waves (FWs), which have been obs... Read More about Linear dynamics in turbulent stratified plane Poiseuille flow.

Paper 4: Instabilities in downslope propagating gravity currents (2024)
Presentation / Conference Contribution
Skevington, E. W. G., Lloyd, C. J., Atoufi, A., & Doak, A. (2023, July). Paper 4: Instabilities in downslope propagating gravity currents. Presented at NFFDy Summer Programme on ‘Data in Fluids’, Cambridge

In this paper, the stability of a gravity current propagating down an inclined channel is explored. The gravity current is generated through a partial lock release. A local analysis of the flow about the lock is conducted using classical methodologie... Read More about Paper 4: Instabilities in downslope propagating gravity currents.

Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms (2023)
Journal Article
Lloyd, C., Mittal, K., Dutta, S., Dorrell, R. M., Peakall, J., Keevil, G. M., & Burns, A. D. (2023). Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms. Royal Society Open Science, 10(2), Article 220684. https://doi.org/10.1098/rsos.220684

We investigate the flow over smooth (non-ribletted) shark skin denticles in an open-channel flow using direct numerical simulation (DNS) and two Reynolds averaged Navier-Stokes (RANS) closures. Large peaks in pressure and viscous drag are observed at... Read More about Multi-fidelity modelling of shark skin denticle flows: insights into drag generation mechanisms.

The coupled dynamics of internal waves and hairpin vortices in stratified plane Poiseuille flow (2022)
Journal Article
Lloyd, C., Dorrell, R., & Caulfield, C.-C. (2022). The coupled dynamics of internal waves and hairpin vortices in stratified plane Poiseuille flow. Journal of Fluid Mechanics, 934, Article A10. https://doi.org/10.1017/jfm.2021.1007

A simulation of stably stratified plane Poiseuille flow at a moderate Reynolds number (Formula Presented) and Richardson number (Formula Presented) is presented. For the first time, the dynamics in the channel core are shown to be described as a seri... Read More about The coupled dynamics of internal waves and hairpin vortices in stratified plane Poiseuille flow.

Hydrodynamic efficiency in sharks: the combined role of riblets and denticles (2021)
Journal Article
Lloyd, C. J., Peakall, J., Burns, A., Keevil, G., Dorrell, R. M., Wignall, P., & Fletcher, T. (2021). Hydrodynamic efficiency in sharks: the combined role of riblets and denticles. Bioinspiration&biomimetics, 16(4), Article 046008. https://doi.org/10.1088/1748-3190/abf3b1

We investigate the influence of smooth and ribletted shark skin on a turbulent boundary layer flow. Through Laser Doppler Anemometry the role of riblets in combination with the shark skin denticle is established for the first time. Our results show t... Read More about Hydrodynamic efficiency in sharks: the combined role of riblets and denticles.

Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size (2020)
Journal Article
Lloyd, C. J., Peakall, J., Burns, A. D., Keevil, G. M., & Dorrell, R. M. (in press). Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size. International Journal of Computational Fluid Dynamics, 34(3), 204-225. https://doi.org/10.1080/10618562.2020.1732941

The sensitivity of a large range of turbulence closures to the near-wall grid resolution is assessed through analytical and numerical techniques. We determine model boundedness, limiting behaviour, and solution dependence of channel flow simulations... Read More about Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size.