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Deshpande, R., Vinuesa, R., Klewicki, J. & Marusic, I. (2025). Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers. Journal of Fluid Mechanics, 1003, Article ID A24.
Open this publication in new window or tab >>Active and inactive contributions to the wall pressure and wall-shear stress in turbulent boundary layers
2025 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 1003, article id A24Article in journal (Refereed) Published
Abstract [en]

A phenomenological description is presented to explain the intermediate and low-frequency/large-scale contributions to the wall-shear-stress (τw) and wall-pressure (pw) spectra of canonical turbulent boundary layers, both of which are well known to increase with Reynolds number, albeit in a distinct manner. The explanation is based on the concept of active and inactive motions (Townsend, J. Fluid Mech., vol. 11, issue 1, 1961, pp. 97-120) associated with the attached-eddy hypothesis. Unique data sets of simultaneously acquired τw, pw and velocity-fluctuation time series in the log region are considered, across a friction-Reynolds-number (Reτ) range of O(103) ≲ Reτ ≲ O(106). A recently proposed energy-decomposition methodology (Deshpande et al., J. Fluid Mech., vol. 914, 2021, A5) is implemented to reveal the active and inactive contributions to the τw- and pw-spectra. Empirical evidence is provided in support of Bradshaw's (J. Fluid Mech., vol. 30, issue 2, 1967, pp. 241-258) hypothesis that the inactive motions are responsible for the non-local wall-ward transport of the large-scale inertia-dominated energy, which is produced in the log region by active motions. This explains the large-scale signatures in the τw-spectrum, which grow with Reτ despite the statistically weak signature of large-scale turbulence production, in the near-wall region. For wall pressure, active and inactive motions respectively contribute to the intermediate and large scales of the pw-spectrum. Both these contributions are found to increase with increasing Reτ owing to the broadening and energization of the wall-scaled (attached) eddy hierarchy. This potentially explains the rapid Reτ-growth of the pw-spectra relative to τw, given the dependence of the latter only on the inactive contributions.

Place, publisher, year, edition, pages
Cambridge University Press (CUP), 2025
Keywords
boundary layer structure, turbulent boundary layers
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-359294 (URN)10.1017/jfm.2024.1218 (DOI)001396512800001 ()2-s2.0-85215379830 (Scopus ID)
Note

QC 20250203

Available from: 2025-01-29 Created: 2025-01-29 Last updated: 2025-02-03Bibliographically approved
Suárez Morales, P., Alcantara-Avila, F., Miro, A., Rabault, J., Font, B., Lehmkuhl, O. & Vinuesa, R. (2025). Active Flow Control for Drag Reduction Through Multi-agent Reinforcement Learning on a Turbulent Cylinder at ReD=3900. Flow Turbulence and Combustion
Open this publication in new window or tab >>Active Flow Control for Drag Reduction Through Multi-agent Reinforcement Learning on a Turbulent Cylinder at ReD=3900
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2025 (English)In: Flow Turbulence and Combustion, ISSN 1386-6184, E-ISSN 1573-1987Article in journal (Refereed) Published
Abstract [en]

This study presents novel drag reduction active-flow-control (AFC) strategies for a three-dimensional cylinder immersed in a flow at a Reynolds number based on freestream velocity and cylinder diameter of ReD=3900. The cylinder in this subcritical flow regime has been extensively studied in the literature and is considered a classic case of turbulent flow arising from a bluff body. The strategies presented are explored through the use of deep reinforcement learning. The cylinder is equipped with 10 independent zero-net-mass-flux jet pairs, distributed on the top and bottom surfaces, which define the AFC setup. The method is based on the coupling between a computational-fluid-dynamics solver and a multi-agent reinforcement-learning (MARL) framework using the proximal-policy-optimization algorithm. This work introduces a multi-stage training approach to expand the exploration space and enhance drag reduction stabilization. By accelerating training through the exploitation of local invariants with MARL, a drag reduction of approximately 9% is achieved. The cooperative closed-loop strategy developed by the agents is sophisticated, as it utilizes a wide bandwidth of mass-flow-rate frequencies, which classical control methods are unable to match. Notably, the mass cost efficiency is demonstrated to be two orders of magnitude lower than that of classical control methods reported in the literature. These developments represent a significant advancement in active flow control in turbulent regimes, critical for industrial applications.

Place, publisher, year, edition, pages
Springer Nature, 2025
Keywords
Fluid mechanics, Drag reduction, Deep learning, Active flow control, Multi-agent reinforcement learning
National Category
Other Engineering and Technologies
Identifiers
urn:nbn:se:kth:diva-361632 (URN)10.1007/s10494-025-00642-x (DOI)001437491200001 ()2-s2.0-86000319598 (Scopus ID)
Note

QC 20250324

Available from: 2025-03-24 Created: 2025-03-24 Last updated: 2025-03-24Bibliographically approved
Cremades, A., Hoyas, S. & Vinuesa, R. (2025). Additive-feature-attribution methods: A review on explainable artificial intelligence for fluid dynamics and heat transfer. International Journal of Heat and Fluid Flow, 112, Article ID 109662.
Open this publication in new window or tab >>Additive-feature-attribution methods: A review on explainable artificial intelligence for fluid dynamics and heat transfer
2025 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 112, article id 109662Article, review/survey (Refereed) Published
Abstract [en]

The use of data-driven methods in fluid mechanics has surged dramatically in recent years due to their capacity to adapt to the complex and multi-scale nature of turbulent flows, as well as to detect patterns in large-scale simulations or experimental tests. In order to interpret the relationships generated in the models during the training process, numerical attributions need to be assigned to the input features. One important example are the additive-feature-attribution methods. These explainability methods link the input features with the model prediction, providing an interpretation based on a linear formulation of the models. The Shapley additive explanations (SHAP values) are formulated as the only possible interpretation that offers a unique solution for understanding the model. In this manuscript, the additive-feature-attribution methods are presented, showing four common implementations in the literature: kernel SHAP, tree SHAP, gradient SHAP, and deep SHAP. Then, the main applications of the additive-feature-attribution methods are introduced, dividing them into three main groups: turbulence modeling, fluid-mechanics fundamentals, and applied problems in fluid dynamics and heat transfer. This review shows that explainability techniques, and in particular additive-feature-attribution methods, are crucial for implementing interpretable and physics-compliant deep-learning models in the fluid-mechanics field.

Place, publisher, year, edition, pages
Elsevier BV, 2025
Keywords
Deep learning, Explainable artificial intelligence, Fluid mechanics, SHAP, Shapley values
National Category
Computer Sciences
Identifiers
urn:nbn:se:kth:diva-357893 (URN)10.1016/j.ijheatfluidflow.2024.109662 (DOI)001433920200001 ()2-s2.0-85211198681 (Scopus ID)
Note

QC 20250317

Available from: 2024-12-19 Created: 2024-12-19 Last updated: 2025-03-17Bibliographically approved
Varelas, P., Larosa, F., Hoyas, S., Conejero, J. A., Contino, F., Nerini, F. F., . . . Vinuesa, R. (2025). Artificial intelligence reveals unbalanced sustainability domains in funded research. Results in Engineering (RINENG), 25, Article ID 104367.
Open this publication in new window or tab >>Artificial intelligence reveals unbalanced sustainability domains in funded research
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2025 (English)In: Results in Engineering (RINENG), ISSN 2590-1230, Vol. 25, article id 104367Article in journal (Refereed) Published
Abstract [en]

To meet the 2030 Agenda for Sustainable Development, all Sustainable Development Goals (SDGs) must receive adequate and balanced funding. This study applies artificial intelligence to analyze research proposals accepted between 2015 and 2023 in the European Union and the United States, focusing on datasets from the European Research Council and the National Science Foundation, respectively. Despite the growing application of Artificial Intelligence (AI) in various domains, there remains a lack of comprehensive analysis that applies AI to examine funding allocation across SDGs and gender disparities in scientific research. This study addresses this unmet need by using AI to uncover imbalances in funding distribution, offering insights into current funding instruments. We reveal critical coverage disparities across SDGs, with both funding instruments prioritizing SDG 9 (Industry, Innovation, and Infrastructure), highlighting a potential overemphasis on this goal. Additionally, we document pronounced gender imbalances among principal investigators across nearly all SDGs, except for SDG 5 (Gender Equality), in which female researchers are comparatively better represented. Our results indicate an urgent need for more inclusive and balanced approaches to achieve sustainable development, starting with allocation of research funding. By providing a nuanced understanding of funding dynamics and advocating strategic reallocations, this study offers actionable policy design and planning insights to foster a more equitable and comprehensive support system for sustainability-focused research endeavours.

Place, publisher, year, edition, pages
Elsevier BV, 2025
Keywords
AI, ChatGPT, ERC, Funding Research, NSF, Scientific Funding, SDGs, Sustainability
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-360576 (URN)10.1016/j.rineng.2025.104367 (DOI)2-s2.0-85217788764 (Scopus ID)
Note

QC 20250227

Available from: 2025-02-26 Created: 2025-02-26 Last updated: 2025-02-27Bibliographically approved
Zampino, G., Atzori, M., Zea, E., Otero, E. & Vinuesa, R. (2025). Aspect-ratio effect on the wake of a wall-mounted square cylinder immersed in a turbulent boundary layer. International Journal of Heat and Fluid Flow, 112, Article ID 109672.
Open this publication in new window or tab >>Aspect-ratio effect on the wake of a wall-mounted square cylinder immersed in a turbulent boundary layer
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2025 (English)In: International Journal of Heat and Fluid Flow, ISSN 0142-727X, E-ISSN 1879-2278, Vol. 112, article id 109672Article in journal (Refereed) Published
Abstract [en]

The wake topology behind a wall-mounted square cylinder immersed in a turbulent boundary layer is investigated using high-resolution large-eddy simulations (LES). The boundary-layer thickness at the obstacle location is fixed, with a Reynolds number based on cylinder height ℎ and free-stream velocity 𝑢∞ of 10,000 while the aspect ratio (AR), defined as obstacle height divided by its width, ranges from 1 to 4. The mesh resolution is comparable to DNS standards used for similar wall-mounted obstacles, though with relatively lower Reynolds numbers. The effects of AR on wake structures, turbulence production, and transport are analyzed via Reynolds stresses, anisotropy-invariant maps (AIM), and the turbulent kinetic energy (TKE)budget. In particular, the transition from ‘‘dipole’’ to a ‘‘quadrupole’’ wake is extensively examined as AR increases. With increasing AR, the wake shrinks in both the streamwise and spanwise directions, attributed to the occurrence of the base vortices (AR = 3 and 4). This change in the flow structure also affects the size of the positive-production region that extends from the roof and the flank of the obstacle to the wake core. The AIMs confirm three-dimensional wake features, showing TKE redistribution in all directions (Simonsen and Krogstad, 2005). Stronger turbulence production in AR = 3 and 4 cases highlights the role of tip and base vortices behind the cylinder. The overall aim is to refine the dipole-to-quadrupole transition as a function of AR and accounting for the incoming TBL properties. The novelty relies on proposing the momentum-thickness-based Reynolds number Re𝜃 as a discriminant for assessing TBL effects on turbulent wake structures.

Place, publisher, year, edition, pages
Elsevier BV, 2025
Keywords
Wall-mounted square cylinder, Turbulent boundary layer, Critical aspect ratio
National Category
Fluid Mechanics Environmental Engineering Aerospace Engineering
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-357714 (URN)10.1016/j.ijheatfluidflow.2024.109672 (DOI)001383291500001 ()2-s2.0-85211096803 (Scopus ID)
Funder
EU, Horizon Europe, 101096698
Note

QC 20250122

Available from: 2024-12-12 Created: 2024-12-12 Last updated: 2025-02-05Bibliographically approved
Aksoy, H., Domene, M. G., Loganathan, P., Blakey, S., Zea, E., Vinuesa, R. & Otero, E. (2025). Case study on SAF emissions from air travel considering emissions modeling impact. Transportation Research Interdisciplinary Perspectives, 29, Article ID 101341.
Open this publication in new window or tab >>Case study on SAF emissions from air travel considering emissions modeling impact
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2025 (English)In: Transportation Research Interdisciplinary Perspectives, ISSN 2590-1982, Vol. 29, article id 101341Article in journal (Refereed) Published
Abstract [en]

The environmental impact of air travel, largely driven by fossil-fuel consumption, remains a critical subject of debate. Addressing this challenge requires immediately adopting sustainable practices to mitigate its environmental footprint. While hydrogen and hybrid-electric propulsion technologies show promise for the future, current efforts focus on Sustainable Aviation Fuels (SAF) as a viable near-term solution to reduce aviation emissions while ensuring compatibility with existing aviation infrastructure. This paper examines the environmental impact of air travel, focusing on the emissions associated with conventional fuel and SAF. Using two methodologies, namely the subsonic fuel flow method (SF2) and an improved version of it, the emissions corrected subsonic fuel flow method (EC-SF2), non-CO2 emissions trends are analyzed along a flight trajectory from Stockholm to Bordeaux. The comparison between the two methods underscores the importance of accurate emission modeling, particularly for SAF correction on emission index. The SF2 method reveals that SAF fuels with higher calorific value than conventional fuel increased total HC and CO emissions while decreasing NOx emissions. Conversely, the EC-SF2 method resulted in a more homogeneous emissions reduction trend. Our proposed methodology, which corrects both fuel flow and emission index based on SAF-specific data, could, therefore, offer a more reliable estimation of emissions behavior for SAF. These findings highlight the sensitivity of emissions modeling on environmental assessment.

Place, publisher, year, edition, pages
Elsevier BV, 2025
Keywords
Sustainable aviation fuels, Emissions analysis, Environmental impact, Air travel
National Category
Transport Systems and Logistics Aerospace Engineering
Research subject
Aerospace Engineering; Transport Science, Transport Systems
Identifiers
urn:nbn:se:kth:diva-359166 (URN)10.1016/j.trip.2025.101341 (DOI)001411936500001 ()2-s2.0-85215944023 (Scopus ID)
Projects
REFMAP
Funder
EU, Horizon Europe, 101096698
Note

QC 20250218

Available from: 2025-01-28 Created: 2025-01-28 Last updated: 2025-02-26Bibliographically approved
Font, B., Alcantara-Avila, F., Rabault, J., Vinuesa, R. & Lehmkuhl, O. (2025). Deep reinforcement learning for active flow control in a turbulent separation bubble. Nature Communications, 16(1), Article ID 1422.
Open this publication in new window or tab >>Deep reinforcement learning for active flow control in a turbulent separation bubble
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2025 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 16, no 1, article id 1422Article in journal (Refereed) Published
Abstract [en]

The control efficacy of deep reinforcement learning (DRL) compared with classical periodic forcing is numerically assessed for a turbulent separation bubble (TSB). We show that a control strategy learned on a coarse grid works on a fine grid as long as the coarse grid captures main flow features. This allows to significantly reduce the computational cost of DRL training in a turbulent-flow environment. On the fine grid, the periodic control is able to reduce the TSB area by 6.8%, while the DRL-based control achieves 9.0% reduction. Furthermore, the DRL agent provides a smoother control strategy while conserving momentum instantaneously. The physical analysis of the DRL control strategy reveals the production of large-scale counter-rotating vortices by adjacent actuator pairs. It is shown that the DRL agent acts on a wide range of frequencies to sustain these vortices in time. Last, we also introduce our computational fluid dynamics and DRL open-source framework suited for the next generation of exascale computing machines.

Place, publisher, year, edition, pages
Springer Nature, 2025
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-360388 (URN)10.1038/s41467-025-56408-6 (DOI)001416000300004 ()39915442 (PubMedID)2-s2.0-85218216283 (Scopus ID)
Note

Correction in doi 10.1038/s41467-025-57534-x

QC 20250507

Available from: 2025-02-26 Created: 2025-02-26 Last updated: 2025-05-07Bibliographically approved
Reichstein, M., Benson, V., Blunk, J., Camps-Valls, G., Creutzig, F., Fearnley, C. J., . . . Weldemariam, K. (2025). Early warning of complex climate risk with integrated artificial intelligence. Nature Communications, 16(1), Article ID 2564.
Open this publication in new window or tab >>Early warning of complex climate risk with integrated artificial intelligence
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2025 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 16, no 1, article id 2564Article in journal (Refereed) Published
Abstract [en]

As climate change accelerates, human societies face growing exposure to disasters and stress, highlighting the urgent need for effective early warning systems (EWS). These systems monitor, assess, and communicate risks to support resilience and sustainable development, but challenges remain in hazard forecasting, risk communication, and decision-making. This perspective explores the transformative potential of integrated Artificial Intelligence (AI) modeling. We highlight the role of AI in developing multi-hazard EWSs that integrate Meteorological and Geospatial foundation models (FMs) for impact prediction. A user-centric approach with intuitive interfaces and community feedback is emphasized to improve crisis management. To address climate risk complexity, we advocate for causal AI models to avoid spurious predictions and stress the need for responsible AI practices. We highlight the FATES (Fairness, Accountability, Transparency, Ethics, and Sustainability) principles as essential for equitable and trustworthy AI-based Early Warning Systems for all. We further advocate for decadal EWSs, leveraging climate ensembles and generative methods to enable long-term, spatially resolved forecasts for proactive climate adaptation.

Place, publisher, year, edition, pages
Springer Nature, 2025
National Category
Climate Science
Identifiers
urn:nbn:se:kth:diva-362003 (URN)10.1038/s41467-025-57640-w (DOI)001445635700022 ()40089483 (PubMedID)2-s2.0-105000241125 (Scopus ID)
Note

QC 20250404

Available from: 2025-04-03 Created: 2025-04-03 Last updated: 2025-04-25Bibliographically approved
Mallor, F., Sanmiguel Vila, C., Hajipour, M., Vinuesa, R., Schlatter, P. & Örlü, R. (2025). Experimental characterization of turbulent boundary layers around a NACA 4412 wing profile. Experimental Thermal and Fluid Science, 160, Article ID 111327.
Open this publication in new window or tab >>Experimental characterization of turbulent boundary layers around a NACA 4412 wing profile
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2025 (English)In: Experimental Thermal and Fluid Science, ISSN 0894-1777, E-ISSN 1879-2286, Vol. 160, article id 111327Article in journal (Refereed) Published
Abstract [en]

An experimental characterization of the turbulent boundary layers developing around a NACA 4412 wing profile is carried out in the Minimum Turbulence Level (MTL) wind tunnel located at KTH Royal Institute of Technology. The campaign included collecting wall-pressure data via built-in pressure taps, capturing velocity signals in the turbulent boundary layers (TBLs) using hot-wire anemometry (HWA), and conducting direct skin-friction measurements with oil-film interferometry (OFI). The research spanned two chord-based Reynolds numbers (Rec=4×105 and 106) and four angles of attack (5°, 8°, 11° and 14°), encompassing a broad spectrum of flow conditions, from mild to strong adverse-pressure gradients (APGs), including scenarios where the TBL detaches from the wing surface. This dataset offers crucial insights into TBL behavior under varied flow conditions, particularly in the context of APGs. Key features include the quasi-independence of the pressure coefficient distributions from Reynolds number, which aids in distinguishing Reynolds-number effects from those due to APG strengths. The study also reveals changes in TBL dynamics as separation approaches, with energy shifting from the inner to the outer region and the eventual transition to a free-shear flow state post-separation. Additionally, the diagnostic scaling in the outer region under spatial-resolution effects is considered, showing further evidence for its applicability for small L+, however with inconsistent results for larger L+. The findings and database resulting from this campaign may be of special relevance for the development and validation of turbulence models, especially in the context of aeronautical applications.

Place, publisher, year, edition, pages
Elsevier BV, 2025
Keywords
Adverse-pressure gradient, Hot-wire anemometry, Turbulence scaling, Turbulent boundary layer, Wind-tunnel experiment
National Category
Fluid Mechanics Vehicle and Aerospace Engineering
Identifiers
urn:nbn:se:kth:diva-354903 (URN)10.1016/j.expthermflusci.2024.111327 (DOI)001333952600001 ()2-s2.0-85205566751 (Scopus ID)
Note

QC 20241030

Available from: 2024-10-16 Created: 2024-10-16 Last updated: 2025-02-14Bibliographically approved
Guastoni, L., Geetha Balasubramanian, A., Foroozan, F., Güemes, A., Ianiro, A., Discetti, S., . . . Vinuesa, R. (2025). Fully convolutional networks for velocity-field predictions based on the wall heat flux in turbulent boundary layers. Theoretical and Computational Fluid Dynamics, 39(1), Article ID 13.
Open this publication in new window or tab >>Fully convolutional networks for velocity-field predictions based on the wall heat flux in turbulent boundary layers
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2025 (English)In: Theoretical and Computational Fluid Dynamics, ISSN 0935-4964, E-ISSN 1432-2250, Vol. 39, no 1, article id 13Article in journal (Refereed) Published
Abstract [en]

Fully-convolutional neural networks (FCN) were proven to be effective for predicting the instantaneous state of a fully-developed turbulent flow at different wall-normal locations using quantities measured at the wall. In Guastoni et al. (J Fluid Mech 928:A27, 2021. https://doi.org/10.1017/jfm.2021.812), we focused on wall-shear-stress distributions as input, which are difficult to measure in experiments. In order to overcome this limitation, we introduce a model that can take as input the heat-flux field at the wall from a passive scalar. Four different Prandtl numbers Pr=ν/α=(1,2,4,6) are considered (where ν is the kinematic viscosity and α is the thermal diffusivity of the scalar quantity). A turbulent boundary layer is simulated since accurate heat-flux measurements can be performed in experimental settings: first we train the network on aptly-modified DNS data and then we fine-tune it on the experimental data. Finally, we test our network on experimental data sampled in a water tunnel. These predictions represent the first application of transfer learning on experimental data of neural networks trained on simulations. This paves the way for the implementation of a non-intrusive sensing approach for the flow in practical applications.

Place, publisher, year, edition, pages
Springer Nature, 2025
Keywords
Machine learning, Turbulence simulation, Turbulent boundary layers
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-358176 (URN)10.1007/s00162-024-00732-y (DOI)001378464000001 ()2-s2.0-85212435435 (Scopus ID)
Note

Not duplicate with DiVA 1756843

QC 20250114

Available from: 2025-01-07 Created: 2025-01-07 Last updated: 2025-02-09Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0001-6570-5499

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