All Outputs (49)

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.

Density stratification controls the bedform phase diagram of saline-gravity currents versus open-channel flows (2023)
Journal Article
Ohata, K., de Cala, I., Dorrell, R. M., Naruse, H., McLelland, S. J., Simmons, S. M., & McCaffrey, W. D. (in press). Density stratification controls the bedform phase diagram of saline-gravity currents versus open-channel flows. Sedimentology, https://doi.org/10.1111/sed.13075

Sedimentary bedforms such as ripples and dunes are generated both by river flows and sediment-laden gravity currents. Gravity current deposits are usually parameterized using existing bedform phase diagrams which are based on data from laboratory exp... Read More about Density stratification controls the bedform phase diagram of saline-gravity currents versus open-channel flows.

Effect of hydro-climate variation on biofilm dynamics and its impact in intertidal environments (2022)
Journal Article
Bastianon, E., Hope, J. A., Dorrell, R. M., & Parsons, D. R. (2022). Effect of hydro-climate variation on biofilm dynamics and its impact in intertidal environments. Earth surface dynamics European Geosciences Union, 10(6), 1115-1140. https://doi.org/10.5194/esurf-10-1115-2022

Shallow tidal environments are very productive ecosystems but are sensitive to environmental changes and sea level rise. Bio-morphodynamic control of these environments is therefore a crucial consideration; however, the effect of small-scale biologic... Read More about Effect of hydro-climate variation on biofilm dynamics and its impact in intertidal environments.

Mixing in density- and viscosity-stratified flows (2022)
Journal Article
Allen, P. A., Dorrell, R. M., Harlen, O. G., Thomas, R. E., & McCaffrey, W. D. (2022). Mixing in density- and viscosity-stratified flows. Physics of Fluids, 34(9), Article 096605. https://doi.org/10.1063/5.0108337

The lock-exchange problem is used extensively to study the flow dynamics of density-driven flows, such as gravity currents, and as a canonical problem to mixing in stratified flows. Opposite halves of a domain are filled with two fluids of different... Read More about Mixing in density- and viscosity-stratified flows.

Time‐Domain Implementation and Analyses of Multi‐Motion Modes of Floating Structures (2022)
Journal Article
Sheng, W., Tapoglou, E., Ma, X., Taylor, C. J., Dorrell, R., Parsons, D. R., & Aggidis, G. (2022). Time‐Domain Implementation and Analyses of Multi‐Motion Modes of Floating Structures. Journal of Marine Science and Engineering, 10(5), Article 662. https://doi.org/10.3390/jmse10050662

The study of wave‐structure interactions involving nonlinear forces would often make use of the popular hybrid frequency–time domain method. In the hybrid method, the frequency‐domain analysis could firstly provide the reliable and accurate dynamic p... Read More about Time‐Domain Implementation and Analyses of Multi‐Motion Modes of Floating Structures.

Graphics processing unit accelerated lattice Boltzmann method simulations of dilute gravity currents (2022)
Journal Article
Adekanye, D., Khan, A., Burns, A., McCaffrey, W., Geier, M., Schönherr, M., & Dorrell, R. (2022). Graphics processing unit accelerated lattice Boltzmann method simulations of dilute gravity currents. Physics of Fluids, 34(4), Article 046602. https://doi.org/10.1063/5.0082959

Lattice Boltzmann method models offer a novel framework for the simulation of high Reynolds number dilute gravity currents. The numerical algorithm is well suited to acceleration via implementation on massively parallel computer architectures. Here w... Read More about Graphics processing unit accelerated lattice Boltzmann method simulations of dilute gravity currents.

Anthropogenic Mixing in Seasonally Stratified Shelf Seas by Offshore Wind Farm Infrastructure (2022)
Journal Article
Dorrell, R. M., Lloyd, C. J., Lincoln, B. J., Rippeth, T. P., Taylor, J. R., Caulfield, C. C. P., …Simpson, J. H. (2022). Anthropogenic Mixing in Seasonally Stratified Shelf Seas by Offshore Wind Farm Infrastructure. Frontiers in Marine Science, 9, Article 830927. https://doi.org/10.3389/fmars.2022.830927

The offshore wind energy sector has rapidly expanded over the past two decades, providing a renewable energy solution for coastal nations. Sector development has been led in Europe, but is growing globally. Most developments to date have been in well... Read More about Anthropogenic Mixing in Seasonally Stratified Shelf Seas by Offshore Wind Farm Infrastructure.

Hydrodynamic studies of floating structures: Comparison of wave-structure interaction modelling (2022)
Journal Article
Sheng, W., Tapoglou, E., Ma, X., Taylor, C. J., Dorrell, R. M., Parsons, D. R., & Aggidis, G. (2022). Hydrodynamic studies of floating structures: Comparison of wave-structure interaction modelling. Ocean engineering, 249, Article 110878. https://doi.org/10.1016/j.oceaneng.2022.110878

Current panel methods for wave-structure interactions employ the potential flow theory, which provide fast, reliable and relatively accurate predictions for the marine structures, and now some open source packages, NEMOH and HAMS, are available. In t... Read More about Hydrodynamic studies of floating structures: Comparison of wave-structure interaction modelling.

The coupled dynamics of internal waves and hairpin vortices in stratified plane Poiseuille flow (2022)
Journal Article
Lloyd, C., Dorrell, R., & Caulfield, 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.

The effect of Schmidt number on gravity current flows: The formation of large-scale three-dimensional structures (2021)
Journal Article
Marshall, C. R., Dorrell, R. M., Dutta, S., Keevil, G. M., Peakall, J., & Tobias, S. M. (2021). The effect of Schmidt number on gravity current flows: The formation of large-scale three-dimensional structures. Physics of Fluids, 33(10), Article 106601. https://doi.org/10.1063/5.0064386

The Schmidt number, defined as the ratio of scalar to momentum diffusivity, varies by multiple orders of magnitude in real-world flows, with large differences in scalar diffusivity between temperature, solute, and sediment driven flows. This is espec... Read More about The effect of Schmidt number on gravity current flows: The formation of large-scale three-dimensional structures.

Equilibrium sediment transport by dilute turbidity currents: Comparison of competence-based and capacity-based models (2021)
Journal Article
Amy, L., & Dorrell, R. (in press). Equilibrium sediment transport by dilute turbidity currents: Comparison of competence-based and capacity-based models. Sedimentology, https://doi.org/10.1111/sed.12921

Equilibrium sediment transport is the condition of zero net entrainment and deposition by sediment-transporting flow (i.e. grade or regime). Here criteria for equilibrium sediment transport, or those used as proxies for equilibrium (for example, onse... Read More about Equilibrium sediment transport by dilute turbidity currents: Comparison of competence-based and capacity-based models.

Satellite data for the offshore renewable energy sector: Synergies and innovation opportunities (2021)
Journal Article
Medina-Lopez, E., McMillan, D., Lazic, J., Hart, E., Zen, S., Angeloudis, A., …Zampollo, A. (2021). Satellite data for the offshore renewable energy sector: Synergies and innovation opportunities. Remote Sensing of Environment, 264, Article 112588. https://doi.org/10.1016/j.rse.2021.112588

Can satellite data be used to address challenges currently faced by the Offshore Renewable Energy (ORE) sector? What benefit can satellite observations bring to resource assessment and maintenance of ORE farms? Can satellite observations be used to a... Read More about Satellite data for the offshore renewable energy sector: Synergies and innovation opportunities.

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.

Observations of large-scale coherent structures in gravity currents: implications for flow dynamics (2021)
Journal Article
Marshall, C. R., Dorrell, R. M., Keevil, G. M., Peakall, J., & Tobias, S. M. (2021). Observations of large-scale coherent structures in gravity currents: implications for flow dynamics. Experiments in Fluids, 62(6), Article 120. https://doi.org/10.1007/s00348-021-03217-4

Density driven flows, also known as gravity currents, comprise a head, body, and tail. Yet whilst the body typically forms the largest part of such flows, its structure remains poorly understood. In this work, experimental data gathered using particl... Read More about Observations of large-scale coherent structures in gravity currents: implications for flow dynamics.

A new modelling approach to sediment bypass prediction applied to the East Coast Basin, New Zealand (2020)
Journal Article
Crisóstomo-Figueroa, A., McArthur, A. D., Dorrell, R. M., Amy, L., & McCaffrey, W. D. (2021). A new modelling approach to sediment bypass prediction applied to the East Coast Basin, New Zealand. Geological Society of America Bulletin, 133(7-8), 1734-1748. https://doi.org/10.1130/B35687.1

Predicting when turbidity currents are erosional or depositional (i.e., leaving no depositional record versus leaving a deposit) remains challenging. Here we combine observations from submarine channel morphology with a new sediment transport model t... Read More about A new modelling approach to sediment bypass prediction applied to the East Coast Basin, New Zealand.

Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan (2020)
Journal Article
Amy, L., & Dorrell, R. (2021). Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan. Icarus, 360, Article 114243. https://doi.org/10.1016/j.icarus.2020.114243

© 2020 The Authors Recent surface observations have emphasised the importance of bedload transport by rivers and streams on Mars and Titan. Previous “hydraulic” analysis, however, has also shown that transport as suspended load should be possible, if... Read More about Equilibrium sediment transport, grade and discharge for suspended-load-dominated flows on Earth, Mars and Titan.

Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents (2020)
Journal Article
de Cala, I., Ohata, K., Dorrell, R., Naruse, H., Patacci, M., Amy, L. A., …McCaffrey, W. D. (2020). Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents. Frontiers in Earth Science, 8, Article 535743. https://doi.org/10.3389/feart.2020.535743

© Copyright© 2020 de Cala, Ohata, Dorrell, Naruse, Patacci, Amy, Simmons, McLelland and McCaffrey. The interaction between turbidity currents and mobile substrates can lead to the development of different types of bedforms. Although much research has... Read More about Relating the Flow Processes and Bedforms of Steady-State and Waning Density Currents.

Turbulence Processes within Turbidity Currents (2020)
Journal Article
Wells, M. G., & Dorrell, R. M. (2021). Turbulence Processes within Turbidity Currents. Annual Review of Fluid Mechanics, 53(1), 59-83. https://doi.org/10.1146/annurev-fluid-010719-060309

Sediment-laden gravity currents, or turbidity currents, are density-driven flows that transport vast quantities of particulate material across the floor of lakes and oceans. Turbidity currents are generated by slope failure or initiated when a sedime... Read More about Turbulence Processes within Turbidity Currents.

An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds (2020)
Journal Article
Clare, M. A., Peakall, J., Lee, D. R., Best, J., Dorrell, R. M., Baas, J. H., …Talling, P. J. (2020). An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds. Sedimentology, https://doi.org/10.1111/sed.12727

Flutes and tool marks are commonly observed sedimentary structures on the bases of sandstones in deep‐water successions. These sole structures are universally used as palaeocurrent indicators but, in sharp contrast to most sedimentary structures, the... Read More about An integrated process-based model of flutes and tool marks in deep-water environments: Implications for palaeohydraulics, the Bouma sequence and hybrid event beds.

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.