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Marcel Désor, Amit Kumar Haldar, Nikolai Kosuch, Wolfgang Polifke, Grégoire Varillon. Large Eddy Simulation of Premixed Hydrogen Flame Flashback Including Conjugate Heat Transfer and Soret Effect. Journal of Engineering for Gas Turbines and Power, 2026, 148 (10), ⟨10.1115/1.4072458⟩. ⟨hal-05733661⟩ Plus de détails...
Boundary-layer flashback is a major risk for lean-premixed combustion of H2-based fuels or fuel blends in low-emission gas turbines. This study demonstrates and critically assesses a methodology based on large eddy simulation (LES) coupled with conjugate heat-transfer (CHT) to predict boundary-layer flashback in turbulent H2 flames without ad hoc parameters. By coupling LES with CHT, we determine flashback limits as observed experimentally on a backward-facing step while avoiding the use of ad hoc thermal boundary conditions. The sensitivity of predictions to modeling and numerical parameters is assessed. It is demonstrated that the model presented is insensitive to external thermal boundary conditions applied on the outer surfaces of the solid parts. Accurate representation of the wall heat-flux in the immediate vicinity of the flame, proper flame resolution, as well as Soret diffusion are identified as key parameters for modeling. In particular, Soret diffusion locally enriches the boundary layer whenever the fuel/air mixture is preheated by heat exchange with solid components. Consequently, neglecting Soret diffusion leads to a nonconservative misprediction of the flashback limit. Flame thickening results in excessive heat loss in the flame zone and consequently leads to a systematic misprediction of the flashback limit. The proposed LES+CHT framework gives insight into the relationship of heat transfer, mixture preheating, and flame motion. The methodology is well-suited to predict thermal runaway limits, where the flame seems stable, but flashes back after sufficiently long operation. The differences between short-term flashback and thermal runaway, and the consequential difficulty of consistent validation with experiment are discussed.
Marcel Désor, Amit Kumar Haldar, Nikolai Kosuch, Wolfgang Polifke, Grégoire Varillon. Large Eddy Simulation of Premixed Hydrogen Flame Flashback Including Conjugate Heat Transfer and Soret Effect. Journal of Engineering for Gas Turbines and Power, 2026, 148 (10), ⟨10.1115/1.4072458⟩. ⟨hal-05733661⟩
Journal: Journal of Engineering for Gas Turbines and Power
Jacques Henri Balbi, François-Joseph Chatelon, Miguel Cruz, Thierry Marcelli, Sofiane Meradji, et al.. The Balbi operational model, a simplified physical model for surface fires. Part I – modelling. International Journal of Wildland Fire, 2026, 35 (9), ⟨10.1071/WF25203⟩. ⟨hal-05739945⟩ Plus de détails...
Background Previously published versions of the ‘Balbi model’ describing surface fire propagation consist of a set of equations based on simplified conservation laws. Their main equation calculating the fire rate of spread (ROS) relied on an iterative process to account for the effect of environmental drivers. Aims We formulated a new version of this model that considers a 3D flame front composed of peaks and troughs, integrates distinct radiation and convection heat transfer mechanisms, and outputs the physical characteristics of a flame front as they are influenced by weather, fuel and topographical conditions. A simpler operational version, composed of only one equation, is also exhibited. Methods While maintaining its characteristics (physics-oriented, fully predictive and faster than real time) from older versions, the global structure of the proposed model is changed to obtain a set of algebraic equations easy to solve and to code. Key results We described the model and provided an analysis of model response to key environmental variables. Model evaluation against independent data is provided in a companion paper. Conclusions A simplified physical propagation model for surface fires has been exhibited. Implications The algebraic nature of the model’s equations makes it suitable to incorporate into fire management decision-making tools to support suppression activities.
Jacques Henri Balbi, François-Joseph Chatelon, Miguel Cruz, Thierry Marcelli, Sofiane Meradji, et al.. The Balbi operational model, a simplified physical model for surface fires. Part I – modelling. International Journal of Wildland Fire, 2026, 35 (9), ⟨10.1071/WF25203⟩. ⟨hal-05739945⟩
François Joseph Chatelon, Miguel Cruz, Jacques Henri Balbi, Thierry Marcelli, Sofiane Meradji, et al.. The Balbi operational model, a simplified physical model for surface fires spread. Part II – model parameterisation and evaluation. International Journal of Wildland Fire, 2026, 35 (9), ⟨10.1071/WF25204⟩. ⟨hal-05739946⟩ Plus de détails...
Background The ‘Balbi model’ is a simplified physical model for surface fires which provides the main physical characteristics of a fire front and its rate of spread (ROS) as a function of general environmental conditions. In the first part of this work, we describe a simplification of this model, which we call Balbi operational model, that leads to a set of explicit algebraic equations. Aims After calibrating the model, we aim to assess its performance by comparing the predicted ROS with laboratory- and field-measured ROS. Methods A small set (n = 40) of laboratory fires was used to find the required model parameters. We evaluated the model against (1) a set of laboratory experimental fires (n = 549), representing a range of fuel bed types and arrangements, and (2) a set of shrubland and grassland field fires (n = 357) from different world regions. We assessed the predictive capacity of the model and compared it with other empirical and semi-empirical models. An analysis on the importance of each heat transfer mechanism is performed. Key results The proposed model performs as well as its previous iteration on shrubland fires and is found to increase accuracy when tested against grassland fires. Conclusions The operational ‘Balbi model’ shares many properties with empirical models, while grounded on physical heat transfer principles. The model is suitable for application to several types of fuels and configurations of slope and wind. Implications Its intrinsic characteristics and verified fit make it a candidate to be used in wildfire propagation simulators.
François Joseph Chatelon, Miguel Cruz, Jacques Henri Balbi, Thierry Marcelli, Sofiane Meradji, et al.. The Balbi operational model, a simplified physical model for surface fires spread. Part II – model parameterisation and evaluation. International Journal of Wildland Fire, 2026, 35 (9), ⟨10.1071/WF25204⟩. ⟨hal-05739946⟩
Adil Mouahid, Cyrielle Girard, Lucero Benitez, Emmanuelle Myotte, Marzoukou Idrissou, et al.. Scaling methodology for supercritical CO2 extraction process: applicability of the solvent-to-feed mass ratio criterion under different flow directions and extraction basket geometries. Chemical Engineering Research and Design, 2026, 233, pp.488-505. ⟨10.1016/j.cherd.2026.08.021⟩. ⟨hal-05734775⟩ Plus de détails...
Adil Mouahid, Cyrielle Girard, Lucero Benitez, Emmanuelle Myotte, Marzoukou Idrissou, et al.. Scaling methodology for supercritical CO2 extraction process: applicability of the solvent-to-feed mass ratio criterion under different flow directions and extraction basket geometries. Chemical Engineering Research and Design, 2026, 233, pp.488-505. ⟨10.1016/j.cherd.2026.08.021⟩. ⟨hal-05734775⟩
This review evaluates fungal bioreactors for the removal of emerging organic pollutants, focusing on pellet-based and immobilized configurations under different operating conditions. A dataset of 71 studies was analyzed by considering reactor configuration, operating mode, and key operating parameters (e.g., pollutant family, carrier type, and wastewater sterility). Overall, removal efficiency was strongly pollutant-dependent. Exploratory comparisons across the available studies suggested that immobilized systems may perform favorably under continuous operation for selected pollutant families, especially non-steroidal anti-inflammatory drugs and antiepileptics. In the dataset analyzed, these families showed median removal efficiencies of 99% and 74%, in immobilized systems, respectively, compared with 85.5% and 50% in pellet-based systems. These trends may be related to improved biomass retention, reduced washout, and greater operational stability; however, the heterogeneity and non-independence of the available data should be considered when interpreting these comparisons. Carrier effects were context-dependent and were most evident for pesticides, while wastewater sterility mainly influenced continuous immobilized systems by affecting biomass stability, microbial competition, and fungal activity. A major limitation in current studies is the focus on parent compound removal, with a limited assessment of the possible toxicity of transformation products. Future research should prioritize long-term continuous operation under non-sterile wastewater conditions, improved immobilization strategies, carrier durability, and transformation product monitoring.
Rosario Baldessarelli, Emmanuel Bertrand, Isabelle Seyssiecq, Cristian Barca. Fungal bioreactors for treatment of emerging organic pollutants: Pellet-based and immobilized configurations. Journal of Environmental Management, 2026, 414, pp.130446. ⟨10.1016/j.jenvman.2026.130446⟩. ⟨hal-05701597⟩
Fatimatou Toure Lo, Magalie Claeys-Bruno, Philippe Moulin, Emilie Carretier. Experimental Design–Guided Optimization of Pervaporative Dehydration of an Esterification Mixture. Membranes, 2026, 16 (7), pp.247. ⟨10.3390/membranes16070247⟩. ⟨hal-05726673⟩ Plus de détails...
This study investigates the pervaporation dehydration of a quaternary esterification mixture containing water, 2-ethylhexyl acrylate, 2-ethylhexanol, and propionic acid using a pilot-scale HybSi membrane (BTESE on Al2O3). A design of experiments was implemented to evaluate the influence of mixture composition on water content in the retentate, permeation flux, and water removal efficiency. Descriptive analysis revealed that the initial water content is the dominant factor governing both permeation flux and dehydration performance, whereas acid, alcohol, and ester have secondary but interactive effects. Reduced cubic polynomial models including linear, binary, and ternary interactions were developed, showing good agreement with experimental data. Ternary diagrams highlighted composition regions where molecular interactions significantly affect separation performance. Multi-response optimization based on desirability functions identified optimal operating conditions at high initial water content (1.146 wt.%), yielding a permeation flux of 0.144 kg·m−2·h−1, a final water content close to the industrial target (0.2 wt.%), and a water removal efficiency of 86%. Experimental validation confirmed the reliability of the predictive model. The results provide insights into composition–performance relationships and demonstrate the suitability of BTESE membranes for low-water-content esterification systems.
Fatimatou Toure Lo, Magalie Claeys-Bruno, Philippe Moulin, Emilie Carretier. Experimental Design–Guided Optimization of Pervaporative Dehydration of an Esterification Mixture. Membranes, 2026, 16 (7), pp.247. ⟨10.3390/membranes16070247⟩. ⟨hal-05726673⟩
Philippe Caron, Athanasia Stoupa, Charles Mégier, Béatrice Morio, Philippe Moulin, et al.. Recommendations for prevention of iodine deficiency during pregnancy and breastfeeding in France. Annales d'Endocrinologie = Annals of Endocrinology, 2026, 87 (4), pp.102580. ⟨10.1016/j.ando.2026.102580⟩. ⟨hal-05697155⟩ Plus de détails...
Philippe Caron, Athanasia Stoupa, Charles Mégier, Béatrice Morio, Philippe Moulin, et al.. Recommendations for prevention of iodine deficiency during pregnancy and breastfeeding in France. Annales d'Endocrinologie = Annals of Endocrinology, 2026, 87 (4), pp.102580. ⟨10.1016/j.ando.2026.102580⟩. ⟨hal-05697155⟩
Journal: Annales d'Endocrinologie = Annals of Endocrinology
Cyrielle Caussy, Bruno Vergès, Fabien Subtil, Amna Abichou-Klich, Valérie Hervieu, et al.. Risk stratification of MASLD-related advanced fibrosis using a novel point-of-care device: the Hepatoscope. Diabetes & Metabolism, 2026, 52 (4), pp.101766. ⟨10.1016/j.diabet.2026.101766⟩. ⟨hal-05712223⟩ Plus de détails...
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⟩
