Numerical errors at walls: on the sensitivity of RANS models to near-wall cell size

Lloyd, C. J.; Peakall, J.; Burns, A. D.; Keevil, G. M.; Dorrell, R. M.

doi:10.1080/10618562.2020.1732941

Tsunami Risk to UK Offshore Wind: Paleo-evidence and numerical model simulation (2025)
Thesis
Pickett, B. (2025). Tsunami Risk to UK Offshore Wind: Paleo-evidence and numerical model simulation. (Thesis). University of Hull. https://hull-repository.worktribe.com/output/5126372

The UK produces over 45% of its energy through renewable means, the majority of this through wind power. The mainstay of this capacity is located offshore in the North Sea, a region and capacity which is set to significantly expand in the coming year... Read More about Tsunami Risk to UK Offshore Wind: Paleo-evidence and numerical model simulation.

The transport and vertical distribution of microplastics in the Mekong River, SE Asia (2024)
Journal Article
Mendrik, F., Hackney, C. R., Cumming, V. M., Waller, C., Hak, D., Dorrell, R., Hung, N. N., & Parsons, D. R. (2025). The transport and vertical distribution of microplastics in the Mekong River, SE Asia. Journal of hazardous materials, 484, Article 136762. https://doi.org/10.1016/j.jhazmat.2024.136762

Rivers are primary vectors of plastic debris to oceans, but sources, transport mechanisms, and fate of fluvial microplastics (<5 mm) remain poorly understood, impeding accurate predictions of microplastic flux, ecological risk and socio-economic impa...

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.

Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow (2024)
Journal Article
Azpiroz-Zabala, M., Sumner, E. J., Cartigny, M. J., Peakall, J., Clare, M. A., Darby, S. E., Parsons, D. R., Dorrell, R. M., Özsoy, E., Tezcan, D., Wynn, R. B., & Johnson, J. (2024). Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow. The Depositional Record, https://doi.org/10.1002/dep2.265

Submarine channels are key features for the transport of flow and nutrients into deep water. Previous studies of their morphology and channel evolution have treated these systems as abiotic, and therefore assume that physical processes are solely res... Read More about Benthic biology influences sedimentation in submarine channel bends: Coupling of biology, sedimentation and flow.

Monopile-induced turbulence and sediment redistribution form visible wakes in offshore wind farms (2024)
Journal Article
Bailey, L. P., Dorrell, R. M., Kostakis, I., McKee, D., Parsons, D., Rees, J., Strong, J., Simmons, S., & Forster, R. (2024). Monopile-induced turbulence and sediment redistribution form visible wakes in offshore wind farms. Frontiers in Earth Science, 12, Article 1383726. https://doi.org/10.3389/feart.2024.1383726

Offshore wind farms are becoming an increasingly common feature in the marine environment as a renewable energy source. There is a growing body of evidence on the effects of wind farms on the seabed and its organisms. However, an important and unders... Read More about Monopile-induced turbulence and sediment redistribution form visible wakes in offshore wind farms.

Dynamics of microplastics particles in rivers: experimental settling processes and numerical models of the transport and deposition (2023)
Thesis
Barrantes, L. I. A. Dynamics of microplastics particles in rivers: experimental settling processes and numerical models of the transport and deposition. (Thesis). University of Hull. https://hull-repository.worktribe.com/output/4367345

Microplastic pollution is an environmental problem facing rivers, oceans, and coastlines. Estimations suggest that around 1.15 to 12.7 million tonnes of plastic waste enter the ocean every year from the global riverine system. In the environment, org... Read More about Dynamics of microplastics particles in rivers: experimental settling processes and numerical models of the transport and deposition.

Streamwise Turbulence Modulation in Non-Uniform Open-Channel Clay Suspension Flows (2023)
Journal Article
de Vet, M. G., Fernández, R., Baas, J. H., McCaffrey, W. D., & Dorrell, R. M. (2023). Streamwise Turbulence Modulation in Non-Uniform Open-Channel Clay Suspension Flows. Journal of Geophysical Research: Earth Surface, 128(8), Article e2022JF006781. https://doi.org/10.1029/2022JF006781

Cohesive sediment particles are ubiquitous in environmental flows. The cohesive properties of clay promote the formation of clay flocs and gels and relatively small suspended clay concentrations can enhance or suppress turbulence in a flow. Furthermo... Read More about Streamwise Turbulence Modulation in Non-Uniform Open-Channel Clay Suspension Flows.

Inadequacy of fluvial energetics for describing gravity current autosuspension (2023)
Journal Article
Fukuda, S., de Vet, M. G., Skevington, E. W., Bastianon, E., Fernández, R., Wu, X., McCaffrey, W. D., Naruse, H., Parsons, D. R., & Dorrell, R. M. (2023). Inadequacy of fluvial energetics for describing gravity current autosuspension. Nature communications, 14(1), Article 2288. https://doi.org/10.1038/s41467-023-37724-1

Gravity currents, such as sediment-laden turbidity currents, are ubiquitous natural flows that are driven by a density difference. Turbidity currents have provided vital motivation to advance understanding of this class of flows because their enigmat... Read More about Inadequacy of fluvial energetics for describing gravity current autosuspension.

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.

Turbulence modulation in non-uniform and unsteady clay suspension flows (2022)
Thesis
de Vet, M. Turbulence modulation in non-uniform and unsteady clay suspension flows. (Thesis). University of Hull. https://hull-repository.worktribe.com/output/4240676

Cohesive sediment is common within natural environments, such as rivers, estuaries, shallow seas and deep oceans. High-magnitude, low-frequency events, such as storms, floods, and post-wildfire erosion, which occur more often due to climate change, c... Read More about Turbulence modulation in non-uniform and unsteady clay suspension flows.

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.

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.-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.

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., Bannon, E., Browell, J., Dorling, S., Dorrell, R. M., Forster, R., Old, C., Payne, G. S., Porter, G., Rabaneda, A. S., Sellar, B., Tapoglou, E., Trifonova, N., Woodhouse, I. H., & 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.

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., Simmons, S., McLelland, S. J., & 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.

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.

All Outputs (31)