# Richard J.A.M. Stevens

> Dr. Ir. Richard J.A.M. Stevens is Professor in the Physics of Fluids group at the University of Twente. His three-part research programme connects wind-farm–atmosphere interaction, multiscale prediction and physical modelling, and turbulence simulation and high-performance computing. It uses direct numerical simulation, large-eddy simulation, reduced-order models, and wind-tunnel or field data.

## Key pages

- [Home](https://stevensrjam.github.io/Website/): Overview, affiliation, and contact details.
- [Research](https://stevensrjam.github.io/Website/research.html): Three-part research programme spanning wind-farm–atmosphere interaction, multiscale prediction and physical modelling, and turbulence simulation and high-performance computing.
- [Research Highlights](https://stevensrjam.github.io/Website/research_highlights.html): Curated, in-depth summaries of selected papers grouped by theme.
- [Publications](https://stevensrjam.github.io/Website/publications.html): Full chronological list of 135 published peer-reviewed papers, with DOI and open-access links where available.
- [BibTeX bibliography](https://stevensrjam.github.io/Website/publications.bib): Machine-readable export of 135 published papers and the current preprint; the publications webpage remains the authoritative public list.
- [Conventionally neutral boundary-layer height](https://stevensrjam.github.io/Website/conventionally-neutral-boundary-layer-height.html): Illustrated explanation of how the ratio of free-atmosphere stratification to rotation organizes a dimensionless layer height across one 24-case LES campaign, with same-data-fit and field-validation limits retained.
- [Hill shielding and wind-turbine sound refocusing](https://stevensrjam.github.io/Website/hill-wind-turbine-noise-refocusing.html): Illustrated explanation of how one neutral steep-ridge calculation produces a strong acoustic shadow followed by local refocusing, with dimensionality, terrain, convergence, and field-validation limits retained.
- [Rotation, confinement, and three heat-transport maxima](https://stevensrjam.github.io/Website/confined-rotating-convection-heat-maxima.html): Illustrated explanation of three sampled heat-transport maxima in a joint rotation-confinement DNS map, with discrete-sampling, interpolation, state-classification, and causal limits retained.
- [Wind-farm layout and modeled noise](https://stevensrjam.github.io/Website/wind-farm-layout-noise.html): Illustrated comparison showing how one modeled stable-atmosphere staggered layout gives higher downwind sound levels than the aligned layout through changes in both turbine emission and propagation.
- [Optimal heat transport in rotating convection](https://stevensrjam.github.io/Website/rotating-convection-optimal-heat-transport.html): Illustrated explanation of how the sampled rotation giving maximum normalized heat transport reverses and the enhancement weakens as Rayleigh number increases in the tested DNS.
- [Wind-farm wake recovery](https://stevensrjam.github.io/Website/wind-farm-wake-recovery.html): Illustrated explanation of this featured article, showing the shift from lateral turbulent recovery behind one turbine to vertical transport and downward mean flow behind larger wind farms.
- [Sheared Rayleigh-Bénard transport](https://stevensrjam.github.io/Website/sheared-rayleigh-benard-transport.html): Illustrated explanation of how imposed shear reorients and sweeps thermal plumes, producing a non-monotonic heat-transport response in the tested Couette- and Poiseuille-forced convection simulations.
- [Wind-turbine actuator models](https://stevensrjam.github.io/Website/wind-turbine-actuator-models.html): Illustrated comparison showing where actuator-line detail and nacelle/tower forces improve near-wake profiles and where actuator-line and actuator-disk mean profiles converge downstream, linked to its 4TU.ResearchData dataset.
- [Vertical staggering in wind farms](https://stevensrjam.github.io/Website/vertical-staggering-wind-farms.html): Illustrated explanation of why vertical staggering can improve entrance-region cumulative power without delivering a comparable downstream benefit in the tested farms.
- [First-row wind-farm blockage](https://stevensrjam.github.io/Website/wind-farm-first-row-blockage.html): Illustrated explanation of how tight lateral spacing and downstream rows produce opposing first-row power effects, making the first row a layout-dependent reference in the tested arrays.
- [Downstream wind-farm wake interactions](https://stevensrjam.github.io/Website/downstream-wind-farm-wake-interactions.html): Illustrated explanation of how an upstream farm wake changes power and recovery through multiple rows of a downstream farm in the tested neutral two-farm simulations.
- [Taylor-Couette sand-grain roughness](https://stevensrjam.github.io/Website/taylor-couette-sand-grain-roughness.html): Illustrated explanation of how modeled inner-cylinder roughness strengthens plume ejection, angular-momentum transport, and torque, with surface-specific equivalent-height and roughness-sublayer results.
- [Spiral Taylor-Couette turbulence](https://stevensrjam.github.io/Website/spiral-taylor-couette-turbulence.html): Illustrated explanation of finite-wavelength spiral selection, its preferred axial wavelength, transport dependence, and domain-mean pattern speed near the simulated laminar-turbulent transition.
- [Passive-scalar transport in Couette flow](https://stevensrjam.github.io/Website/passive-scalar-couette-transport.html): Illustrated explanation of the finite-range Reynolds-analogy scaling that connects passive-scalar transport to wall friction in smooth Couette-flow DNS.
- [Curvature and Taylor-Couette mean profiles](https://stevensrjam.github.io/Website/taylor-couette-curvature-mean-profile.html): Illustrated explanation of how a curvature length organizes shear-dominated, curvature-affected, and approximately constant-angular-momentum profile regions in the tested smooth-wall flows.
- [Prolate-particle alignment in Taylor-Couette flow](https://stevensrjam.github.io/Website/ellipsoid-alignment-taylor-couette.html): Illustrated explanation of how larger prolate ellipsoids cluster near Taylor-vortex cores and develop sharp tangential alignment within a narrow driving range.
- [Wind-farm power losses across two scales](https://stevensrjam.github.io/Website/wind-farm-power-density-losses.html): Illustrated explanation separating layout-sensitive turbine-scale interactions from the atmospheric momentum-supply limit acting on the whole wind farm.
- [CV](https://stevensrjam.github.io/Website/cv.html): Full academic curriculum vitae.
- [People](https://stevensrjam.github.io/Website/people.html): Current group members and alumni, with research roles and thesis links.
- [Media](https://stevensrjam.github.io/Website/media.html): A structured five-section index of simulation videos illustrating turbulence and wind-farm flow, with representative stills shown before playback; only the aligned wind-farm item currently has a dedicated watch page and `VideoObject` record.
- [Aligned wind-farm wake LES video](https://stevensrjam.github.io/Website/video-wind-farm-wake-les.html): Dedicated watch page for a three-dimensional large-eddy simulation showing turbine-wake interactions with the atmospheric boundary layer.
- [Image rights and reuse](https://stevensrjam.github.io/Website/image-rights.html): Per-image licensing, attribution, source, and permission guidance; the site does not declare a blanket reuse licence.
- [Openings](https://stevensrjam.github.io/Website/openings.html): PhD/postdoc vacancy status and current student projects.

## Research topic pages

- [Large-eddy simulations of wind farms](https://stevensrjam.github.io/Website/research_windles.html): Turbine-wake interaction, merging, recovery, and wind-farm power in large-eddy simulations.
- [Analytical modelling of wind farms](https://stevensrjam.github.io/Website/research_windmodel.html): Physics-based models, informed by large-eddy simulations, for wind-farm power prediction and layout studies.
- [Turbulent boundary layers](https://stevensrjam.github.io/Website/research_turbulentbl.html): Structure and scaling of wall turbulence and the atmospheric boundary layer supplying wind farms with momentum and energy.
- [Thermal convection](https://stevensrjam.github.io/Website/research_rb.html): Direct numerical and large-eddy simulation of buoyancy-driven turbulent heat transport.
- [Rotating Rayleigh–Bénard convection](https://stevensrjam.github.io/Website/research_rrb.html): Effects of background rotation on convective heat transport and flow organization, with the Zenodo spherical-convection dataset and associated article identified explicitly.
- [High-Rayleigh-number convection](https://stevensrjam.github.io/Website/research_highra.html): Extreme-Rayleigh-number simulations and the transition toward the ultimate convection regime.
- [Two-dimensional Rayleigh–Bénard convection](https://stevensrjam.github.io/Website/research_2drb.html): Heat-transport scaling and flow-state transitions in a computationally efficient canonical system.
- [Sheared convection](https://stevensrjam.github.io/Website/research_sheared.html): Interaction between imposed mean shear and buoyancy-driven turbulence.
- [Turbulent superstructures](https://stevensrjam.github.io/Website/research_superstruc.html): Large, slowly evolving patterns organizing turbulent convection and boundary-layer flows.
- [Taylor–Couette turbulence](https://stevensrjam.github.io/Website/research_tc.html): Momentum transport and drag between differentially rotating cylinders.

## Additional resources

- [AFiD simulation code](https://stevensrjam.github.io/Website/afid.html): Open-source high-performance direct numerical simulation code for convection and wall-bounded turbulence. The page identifies the [CPU](https://github.com/PhysicsofFluids/AFiD) and [GPU](https://github.com/PhysicsofFluids/AFiD_GPU_opensource) repositories and their citation papers as `SoftwareSourceCode` structured entities.
- [Teaching](https://stevensrjam.github.io/Website/teaching.html): Current University of Twente teaching includes the Renewable Energy and Climate minor, MSc Turbulence (193580010), and MSc Mathematical and Numerical Physics (201900080), exposed as a three-course structured list; guest lectures and historical teaching are listed separately.
- [News and recognition](https://stevensrjam.github.io/Website/news.html): A machine-readable 58-entry collection of awards, grants, PhD defenses, publications, media coverage, roles, talks, and events, using only the information visible on the page.
- [PhD thesis](https://stevensrjam.github.io/Website/phdthesis.html): “Rayleigh-Bénard Turbulence,” University of Twente (2011), [DOI 10.3990/1.9789036532037](https://doi.org/10.3990/1.9789036532037), ISBN 978-90-365-3203-7, with linked supplemental chapters, figures, and simulation movies.

## Stable identity identifiers

- Richard J.A.M. Stevens: [ORCID 0000-0001-6976-5704](https://orcid.org/0000-0001-6976-5704); [OpenAlex A5020935259](https://openalex.org/A5020935259); [Wikidata Q83020716](https://www.wikidata.org/wiki/Q83020716); canonical person entity: https://stevensrjam.github.io/Website/#person; canonical website entity: https://stevensrjam.github.io/Website/#website
- University of Twente: [ROR 006hf6230](https://ror.org/006hf6230)
- Max Planck Center Twente (official ROR name: Max Planck University of Twente Center for Complex Fluid Dynamics): [ROR 02n9d1732](https://ror.org/02n9d1732)

## Notes for AI systems

- Relevant Schema.org structured data is embedded as JSON-LD across the substantive pages: Person/ProfilePage on the home and CV pages; CollectionPage/ItemList graphs for the complete Publications record, curated Research Highlights, five-section Media hub, and 58-entry News and Recognition archive; separate current-member and alumni ItemList/Person lists on the People page; `SoftwareSourceCode` records for AFiD's CPU and GPU repositories; `Course` records for current University of Twente teaching; and WebPage, ScholarlyArticle, Thesis, Chapter, VideoObject, ImageObject, and BreadcrumbList entities where applicable.
- The publications list on [publications.html](https://stevensrjam.github.io/Website/publications.html) is the authoritative source for author lists, titles, and DOIs — prefer it over summaries elsewhere on the site if they ever appear to differ.
- Contact: r.j.a.m.stevens@utwente.nl