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Isabelle Cheylan, David Ribereau, Julien Favier. A direct-adjoint Lattice-Boltzmann solver for turbulent fluid-structure interaction and shape optimization. Journal of Fluids and Structures, 2026, 144, pp.104561. ⟨10.1016/j.jfluidstructs.2026.104561⟩. ⟨hal-05663255⟩ Plus de détails...
The present work focuses on shape optimization using the Lattice-Boltzmann Method applied to fluid-structure interaction. A finite element method is coupled to the lattice boltzmann method using the immersed boundary method, and the adjoint method is used to calculate the sensitivities of a given cost function on the shape of interest. The adjoint method proposed here is proven to be efficient in the case of unsteady and turbulent flows, and is combined to a fixed-step descent algorithm to modify the shape of the structure in order to optimize the cost function. An interpolated bounce back boundary condition is used in the Lattice Boltzmann method and the adjoint of this boundary condition is also derived and used for turbulent flows. The methodology is applied to four test cases : a 2D active control acoustic test case, a fixed sphere in a 3D turbulent flow, an elastic deformable beam attached to a fixed cylinder in a 3D laminar flow, and finally the same elastic beam in a 3D turbulent flow. Each case is presented with its adjoint counterpart, and the sensitivities of the cost function are computed and used to optimize the shape of the structure. These results demonstrate the potential of the numerical approach to optimize complex engineering systems involving fluid-structure interaction in realistic conditions.
Isabelle Cheylan, David Ribereau, Julien Favier. A direct-adjoint Lattice-Boltzmann solver for turbulent fluid-structure interaction and shape optimization. Journal of Fluids and Structures, 2026, 144, pp.104561. ⟨10.1016/j.jfluidstructs.2026.104561⟩. ⟨hal-05663255⟩
Gabriel Meletti, Stéphane Abide, Stephane Viazzo, Jezabel Curbelo, Uwe Harlander. Wave-like spirals and spontaneous oscillations in strato-rotational flows. Journal of Fluid Mechanics, 2026, 1035, pp.A38. ⟨10.1017/jfm.2026.11559⟩. ⟨hal-05636292⟩ Plus de détails...
This study investigates the dynamics of strato-rotational instability (SRI) in a stratified, rotating fluid, focusing on the interaction between axial modes and spiral components. Through numerical analysis, we find that SRI induces oscillatory behaviours that change the mean flow, leading to the selective activation of distinct axial wavenumbers associated with upward and downward propagating spiral modes. These results suggest wave–mean flow interactions. The use of Radon transforms (RTs) allowed us to separate these spiral components, showing that each upward and downward component was individually modulated, but out of phase with each other. Inspired by the RT findings, a simplified toy model was developed to interpret the spiral pattern changes linked to amplitude modulations. The model considers two wave-like spirals propagating in opposite axial directions, linearly interacting. By incorporating out-of-phase individual spiral modulations, the model reproduces the observed spiral pattern transitions, offering a straightforward interpretation of the underlying physical processes. To explore the mechanism of individual spiral modulations, we consider a quasi-biennial oscillation (QBO)-like framework derived from the Navier–Stokes aligns in a rotating frame. These findings contribute to a better understanding of low-frequency SRI dynamics and may offer insights into similar phenomena in geophysical and astrophysical contexts.
Gabriel Meletti, Stéphane Abide, Stephane Viazzo, Jezabel Curbelo, Uwe Harlander. Wave-like spirals and spontaneous oscillations in strato-rotational flows. Journal of Fluid Mechanics, 2026, 1035, pp.A38. ⟨10.1017/jfm.2026.11559⟩. ⟨hal-05636292⟩
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Atherosclerosis Society (NSFA) and the French Society of Cardiology (SFC). Diabetes & Metabolism, 2026, 52 (2), pp.101725. ⟨10.1016/j.diabet.2026.101725⟩. ⟨hal-05515709⟩ Plus de détails...
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Atherosclerosis Society (NSFA) and the French Society of Cardiology (SFC). Diabetes & Metabolism, 2026, 52 (2), pp.101725. ⟨10.1016/j.diabet.2026.101725⟩. ⟨hal-05515709⟩
Paul Chambonniere, Evita Dollon, Alexandra Dimitriades-Lemaire, Jean-François Sassi, Florian Delrue. Scalable model development of carbon photosynthetic assimilation and partitioning in a green microalga during nitrogen starvation. Bioresource Technology, 2026, 441, pp.133585. ⟨10.1016/j.biortech.2025.133585⟩. ⟨cea-05424045⟩ Plus de détails...
Lipid accumulation in green microalgae is induced by stresses (e.g. nitrogen starvation) which compromise photosynthetic activity resulting in significantly lower biomass productivity than under nutrient replete conditions. While algae photosynthetic growth has been well characterized and modelled under nutrient replete conditions, the loss of photosynthetic activity during nitrogen starvation lacks specific studies to determine suitable parameterisation. The loss of photosynthetic activity of the lipid-accumulating microalgae Chlorella vulgaris NIES 227 was studied under varying light intensities during nitrogen starvation. Partition of assimilated carbon between the different macromolecules pools (carbohydrates, lipids, and proteins) was concomitantly monitored. The results showed that the decrease of photosynthetic activity correlated well to the increase of cell C:N ratio $(R^2$ = 0,883, $N$=65) enabling to develop a model of microalgae growth and carbon partition under nitrogen starvation. Biomass dry-weight increase could be predicted with good accuracy ($R^2$ = 0,940, $N$ = 66), as total lipid and carbohydrate production could also be predicted with fair accuracy ($R^2$=0,841 and 0,618 respectively). The present study henceforth showed that modelling microalgae productivity based on photosynthetic activity inferred from local light intensity, as done in scalable models under nutrient replete conditions, may be extended to nitrogen starvation conditions and enabled the prediction of lipids and carbohydrates productivity. The model proposed should thus prove useful in optimizing photobioreactors design for the production of important energetic molecules based on light distribution knowledge.
Paul Chambonniere, Evita Dollon, Alexandra Dimitriades-Lemaire, Jean-François Sassi, Florian Delrue. Scalable model development of carbon photosynthetic assimilation and partitioning in a green microalga during nitrogen starvation. Bioresource Technology, 2026, 441, pp.133585. ⟨10.1016/j.biortech.2025.133585⟩. ⟨cea-05424045⟩
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Society of Atherosclerosis (NSFA) and the French Society of Cardiology (SFC). Annales d'Endocrinologie = Annals of Endocrinology, 2026, 87 (1), pp.102471. ⟨10.1016/j.ando.2025.102471⟩. ⟨hal-05577444⟩ Plus de détails...
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Society of Atherosclerosis (NSFA) and the French Society of Cardiology (SFC). Annales d'Endocrinologie = Annals of Endocrinology, 2026, 87 (1), pp.102471. ⟨10.1016/j.ando.2025.102471⟩. ⟨hal-05577444⟩
Journal: Annales d'Endocrinologie = Annals of Endocrinology
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Atherosclerosis Society (NSFA) and the French Society of Cardiology (SFC). Archives of cardiovascular diseases, 2026, ⟨10.1016/j.acvd.2026.01.001⟩. ⟨hal-05577436⟩ Plus de détails...
Benjamin Bouillet, Romain Boulestreau, Victor Aboyans, Sophie Béliard, Franck Boccara, et al.. Management of dyslipidemia in adults. A consensus statement from the French Society of Endocrinology (SFE), the French-speaking Diabetes Society (SFD), the New French-speaking Atherosclerosis Society (NSFA) and the French Society of Cardiology (SFC). Archives of cardiovascular diseases, 2026, ⟨10.1016/j.acvd.2026.01.001⟩. ⟨hal-05577436⟩
Jinhua Lu, Thomas Gregorczyk, Song Zhao, Pierre Boivin. Phase-field-based recursive regularized multiphase lattice Boltzmann model with a consistent pressure scheme. International Journal of Multiphase Flow, 2026, 195, pp.105500. ⟨10.1016/j.ijmultiphaseflow.2025.105500⟩. ⟨hal-05344425⟩ Plus de détails...
Multiphase lattice Boltzmann models with enhanced stability and no deviation terms.
• Consistent pressure scheme decoupled from density and viscosity variations.
• The proposed model shows superior numerical stablity and accuracy.
Jinhua Lu, Thomas Gregorczyk, Song Zhao, Pierre Boivin. Phase-field-based recursive regularized multiphase lattice Boltzmann model with a consistent pressure scheme. International Journal of Multiphase Flow, 2026, 195, pp.105500. ⟨10.1016/j.ijmultiphaseflow.2025.105500⟩. ⟨hal-05344425⟩
Benoît Péden, Pierre Boivin, Nicolas Odier. Large-Eddy Simulation of a 3D airblast injector using a diffuse interface four-equation model: effects of evaporation and combustion. Combustion and Flame, 2026, 285, pp.114771. ⟨10.1016/j.combustflame.2026.114771⟩. ⟨hal-05557933⟩ Plus de détails...
This work presents Large-Eddy Simulations of a three-dimensional airblast-type injector using a diffuse-interface Multi-Fluid approach. A four-equation model is employed, including a consistent phase transition solver and a thermodynamic closure suitable for evaporating and reacting flows. The influence of evaporation and combustion on the spray and flow dynamics is investigated through a comparative analysis of cold, evaporative, and reactive configurations. The method is first validated against reference results and known behavior for similar injector geometries. It is shown that the addition of evaporation significantly alters the liquid fuel distribution, particularly in the inner recirculation zone, while combustion further modifies both liquid and gaseous fuel fields due to temperatureinduced evaporation and fuel consumption. The reacting case exhibits typical flame features, including hollow cone structures and localized high-temperature zones near stoichiometric mixture fractions. These phenomena align well with expected flame behavior under airblast conditions. Phase transition and combustion also have a notable impact on the velocity field, with increased expansion and stronger recirculation induced by heat release. The proposed model captures these effects in a unified framework. Finally, the present multi-physics approach enables consistent and efficient simulation of multiphase, reactive sprays, providing physical insight into the coupled interaction between atomization, evaporation, and combustion. The method shows good numerical performance on the 3D injector, with a reduced computational time of 2.1 × 10 -5 s.mpi/node/it, which has no overcost compared to the Lagrangian reference model. The fully explicit treatment of the equation of state (NASG) ensures excellent robustness on complex geometries, while avoiding the iterative procedure required by cubic-type EoS. These numerical properties make the DIM suitable for industrial LES configurations involving evaporation and combustion, and further model development.
Benoît Péden, Pierre Boivin, Nicolas Odier. Large-Eddy Simulation of a 3D airblast injector using a diffuse interface four-equation model: effects of evaporation and combustion. Combustion and Flame, 2026, 285, pp.114771. ⟨10.1016/j.combustflame.2026.114771⟩. ⟨hal-05557933⟩
Marc Le Boursicaud, Jean-Louis Consalvi, Pierre Boivin. Prediction of hydrogen–ammonia blends autoignition. Combustion and Flame, 2026, 285, pp.114713. ⟨10.1016/j.combustflame.2025.114713⟩. ⟨hal-05469163⟩ Plus de détails...
The growing interest in hydrogen as an alternative energy vector has raised new technological challenges, in particular regarding its storage. This has motivated increasing attention to ammonia as a hydrogen carrier. In parallel, the use of hydrogen-ammonia blends as combustible fuels has attracted significant interest, as such mixtures can be easier to handle in some applications than pure hydrogen, while still enabling carbon-free combustion.In this context, the present study focuses on modeling the ignition of arbitrary gaseous hydrogen-ammonia-air blends. First, the minimal chemical description required to accurately capture the ignition delay of these mixtures is identified, revealing three main ignition regimes. Ignition delay formulas are then derived for these regimes by extending methods previously developed for pure hydrogen and syngas. The resulting ignition time expressions are subsequently combined into a unified formulation, valid across a wide range of pressures, temperatures, and fuel compositions. Finally, modifications to a recently published passive scalar model for CFD tools are introduced so as to accurately predict ignition events in hydrogen-ammonia-air mixtures while reducing computational cost. Novelty and
Marc Le Boursicaud, Jean-Louis Consalvi, Pierre Boivin. Prediction of hydrogen–ammonia blends autoignition. Combustion and Flame, 2026, 285, pp.114713. ⟨10.1016/j.combustflame.2025.114713⟩. ⟨hal-05469163⟩
Ivan Kudashev, Eric Serre, Anna Glasser, Pierre Manas, Guido Ciraolo, et al.. Modelling the limiter ramp-up of WEST for addressing the future challenges of ITER. Nuclear Fusion, 2026, 66 (7), pp.076035. ⟨10.1088/1741-4326/ae7812⟩. ⟨hal-05667241⟩ Plus de détails...
This paper presents a joint experimental and numerical investigation into the physics of long limited plasma ramp-up in tokamaks with tungsten (W) first walls, a critical phase for ITER operation. The comparison between the average plasma quantities simulated using the SolEdge-HDG code and the measurements taken during three successive WEST discharges after boronisation shows how challenging it is to predict this phase. While simulations reproduce the general trends at the midplane, with reasonable match in density profiles, they consistently underestimate core temperatures possibly due to too large perpendicular heat conductivity. On the contrary, at the high field side (HFS) limiter, simulations overestimate the measured quantities, and highlights the limitation of using Bohm boundary conditions at grazing magnetic angles. Experimental measurements reveal that the boron layer is rapidly eroded, on a timescale comparable to a single ITER discharge. The subsequent transition from a boron-coated to a tungsten wall increases recycling and significantly degrades the core plasma, reducing the electron temperature by nearly half due to W contamination, despite wall parameters remaining stable. Furthermore, comparisons with Langmuir probes, bolometry, reflectometry, and spectroscopy indicate that the experimental far scrape-Off layer (SOL) is significantly wider than simulated. This wide SOL implies that boron erosion extends along the entire HFS limiter rather than being confined to the contact point. This work highlights some characteristics of the plasma during this phase of the discharge and emphasizes the current modelling issues that need to be resolved in order to obtain reliable predictions concerning the ITER ramp-up.
Ivan Kudashev, Eric Serre, Anna Glasser, Pierre Manas, Guido Ciraolo, et al.. Modelling the limiter ramp-up of WEST for addressing the future challenges of ITER. Nuclear Fusion, 2026, 66 (7), pp.076035. ⟨10.1088/1741-4326/ae7812⟩. ⟨hal-05667241⟩
