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11 results on '"Lokman Bennani"'

1. Numerical Simulation of an Electrothermal Ice Protection System in Anti-Icing and Deicing Mode

Author

Lokman Bennani, Pierre Trontin, and Emmanuel Radenac

Subjects
thermal ice protection, ice accretion, boundary layer, anti-icing, deicing, modelling, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

The design of efficient thermal ice protection systems is a challenging task as these systems operate in complex environments involving several coupled physical phenomena such as phase change, boundary-layer flow, and heat transfer. Moreover, certification rules are becoming more stringent, and there is a strong incentive for the reduction of fuel consumption. In this context, numerical tools provide a powerful asset during the design phase but also to gain insight into the physical mechanisms at play. This article presents modeling and simulation strategies for thermal ice protection systems. First, the model describing the behavior of the thermal protection system is presented. Second, a model and associated numerical method is presented for unsteady ice accretion. Third, the coupling methodology between the ice accretion solver and the heat conduction solver is described. In the fourth part, different methods to simulate the boundary-layer flow are described. Finally, some relevant examples are presented, both in steady and unsteady configurations.

Published
2023
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2. Improving mechanical ice protection systems with topology optimization

Author

Alexis Marbœuf, Marc Budinger, Valérie Pommier-Budinger, Valérian Palanque, Lokman Bennani, Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), ONERA / DMPE, Université de Toulouse [Toulouse], and ONERA-PRES Université de Toulouse

Subjects
[SPI.OTHER]Engineering Sciences [physics]/Other, Control and Optimization, Electromechanical de-icing, Adjoint method, [PHYS.MECA]Physics [physics]/Mechanics [physics], Computer Graphics and Computer-Aided Design, Computer Science Applications, Autre, Adhesive fracture, Control and Systems Engineering, Topology optimization, Energy release rate, Software
Abstract

International audience; In the context of more electrical aircraft, electromechanical de-icing systems provide a low-energy solution to protect aircraft surfaces from ice buildup. Such systems produce deformation of the protected surface leading to stress production within the ice and, ultimately, to ice shedding thanks to fracture. However, these systems may show limitations when it comes to completely protecting a given surface. Ice delamination is often restricted to a part of the surface and the remaining ice either requires more energy to be removed or is just impossible to remove. In this paper, topology optimization of the substrate covered by ice is thus investigated to increase fracture propagation and ice shedding. For that purpose, an optimization problem, involving the energy release rate but also the mass and the substrate stress, is formulated. The numerical results show how the delamination efficiency of mechanical-based ice protection systems can be improved through the topologymodification of the substrate.

Published
2022
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3. A non-overlapping optimized Schwarz method for the heat equation with non linear boundary conditions and with applications to de-icing

Author

Rémi Chauvin, Philippe Villedieu, Lokman Bennani, Pierre Trontin, ONERA / DMPE, Université de Toulouse [Toulouse], ONERA-PRES Université de Toulouse, Laboratoire de Détection et de Géophysique (CEA) (LDG), DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Work (thermodynamics), COUPLING, 010103 numerical & computational mathematics, 01 natural sciences, SCHWARZ METHOD, [SPI]Engineering Sciences [physics], Linearization, Convergence (routing), Applied mathematics, NUMERICAL SIMULATION, Boundary value problem, 0101 mathematics, GIVRAGE AVION, Physics::Atmospheric and Oceanic Physics, Mathematics, METHOD SCHWARZ, [PHYS]Physics [physics], COUPLAGE, Computer simulation, AIRCRAFT ICING, DEGIVRAGE ELECTROTHERMIQUE, Thermal conduction, 010101 applied mathematics, Computational Mathematics, Nonlinear system, SIMULATION NUMERIQUE, Computational Theory and Mathematics, Modeling and Simulation, Heat equation, ELECTROTHERMAL DE-ICING
Abstract

International audience; When simulating complex physical phenomena such as aircraft icing or de-icing, several dedicated solvers often need to be strongly coupled. In this work, a non-overlapping Schwarz method is constructed with the unsteady simulation of de-icing as the targetted application. To do so, optimized coupling coefficients are first derived for the one dimensional unsteady heat equation with linear boundary conditions and for the steady heat equation with non-linear boundary conditions. The choice of these coefficients is shown to guarantee the convergence of the method. Using a linearization of the boundary conditions, the method is then extended to the case of a general unsteady heat conduction problem. The method is tested on simple cases and the convergence properties are assessed theoretically and numerically. Finally the method is applied to the simulation of an aircraft electrothermal de-icing problem in two dimensions.

Published
2020
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4. A survey of icephobic coatings and their potential use in a hybrid coating/active ice protection system for aerospace applications

Author

Elmar Bonaccurso, Philippe Villedieu, Xiao Huang, Marc Budinger, Valérie Pommier-Budinger, Lokman Bennani, Nick Tepylo, Department of Mechanical and Aerospace Engineering, Département de Mathématiques, Informatique, Automatique ( DMIA ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ), Institut Clément Ader ( ICA ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ) -IMT École nationale supérieure des Mines d'Albi-Carmaux ( IMT Mines Albi ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Airbus Groups Innovations, ONERA, Université de Toulouse ( ONERA, Université de Toulouse (F-31055 Toulouse - France) ), ONERA-PRES Université de Toulouse, Department of Mechanical and Aerospace Engineering (MAE), Carleton University, Département Conception et conduite des véhicules Aéronautiques et Spatiaux (DCAS), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Airbus Defence and Space Germany, ONERA / DMPE, Université de Toulouse [Toulouse], Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Airbus (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Carleton University (CANADA), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Département Modèles pour l'Aérodynamique et l'Énergétique - DMAE (Toulouse, France)

Subjects
Icephobic coating, Ice adhesion, Electro-mechanical de-icing, Aerospace Engineering, 02 engineering and technology, engineering.material, 7. Clean energy, 01 natural sciences, 010305 fluids & plasmas, [SPI.MAT]Engineering Sciences [physics]/Materials, 0203 mechanical engineering, Coating, [ SPI.NRJ ] Engineering Sciences [physics]/Electric power, 0103 physical sciences, Hybrid ice protection system, Aerospace engineering, Aerospace, 020301 aerospace & aeronautics, Expediting, Ice protection system, business.industry, Mechanical Engineering, De-icing, 13. Climate action, Mechanics of Materials, Hybrid system, engineering, Ice nucleus, Environmental science, Anti-icing, Mécanique des matériaux, Biomimetics, business
Abstract

International audience; Icephobic coatings for aircraft and other surfaces subjected to ice accretion have generated great interest in the past two decades, due to the advancement of nanomaterials, coating fabrication methods, biomimetics, and a more in-depth understanding of ice nucleation and ice adhesion. Icephobic coatings have demonstrated the ability to repel water droplets, delay ice nucleation and significantly reduce ice adhesion. Despite these ongoing research activities and promising results, the findings reported hereafter suggest that coatings alone cannot be used for aircraft anti-icing and de-icing operations; rather, they should be considered as a complementary option to either thermal or mechanical ice protection methods, for reducing power consumption and the ecological footprint of these active systems and for expediting ground de-icing operations. This paper will first review the state-of-the-art of icephobic coatings for various applications, including their performance and existing deficiencies. The second part of this paper focuses on aerospace anti-icing and de-icing requirements and the need for hybrid systems to provide a complete ice protection solution. Lastly, several urgent issues facing further development in the field are discussed.

Published
2019
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5. Electromechanical resonant ice protection systems: numerical investigation through a phase-field mixed adhesive/brittle fracture model

Author

Marc Budinger, Lokman Bennani, Alexis Marbœuf, Valérie Pommier-Budinger, ONERA / DMPE, Université de Toulouse [Toulouse], ONERA-PRES Université de Toulouse, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
Phase-field methods, FRACTURE MECHANICS, Work (thermodynamics), PHASE-FIELD METHODS, Materials science, Field (physics), ELECTROMECHANICAL DE-ICING, 0211 other engineering and technologies, MODELISATION NUMERIQUE, Context (language use), 02 engineering and technology, ADHESIVE DEBONDING, Stress (mechanics), [SPI]Engineering Sciences [physics], Autre, 0203 mechanical engineering, FRACTURE MECHANIQUE, Phase (matter), Fracture mechanics, General Materials Science, 021101 geological & geomatics engineering, [PHYS]Physics [physics], NUMERICAL MODELLING, Electromechanical de-icing, Mechanical Engineering, DEGIVRAGE ELECTROMAGNETIQUE, Mechanics, 020303 mechanical engineering & transports, Numerical modelling, Adhesive debonding, Mechanics of Materials, Fracture (geology), Actuator
Abstract

International audience; Electromechanical resonant de-icing systems provide a low-energy solution against ice accumulation on aircraft. Recent researches show a growing interest towards these systems in the context of more electrical aircraft. Electrome-chanical de-icing systems consists in electric actuators producing stress within the ice, through micro-vibrations of the surface to be protected, leading to bulk or adhesive failure and, ultimately, ice shedding. The understanding of the mechanisms at play is of prime importance in order to design efficient ice protection systems. Despite a large number of studies in the literature, there is still a lack when dealing with fracture propagation phenomena in this context. In this work the authors propose a model based on the well established phase-field variational approach to fracture. The approach is applied to the study of crack propagation and debonding of ice under the effect of an electromechanical resonant de-icing system. Numerical experiments are performed in order to assess possible ice shedding mechanisms.

Published
2020
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6. Electro-mechanical Resonant Ice Protection Systems: Analysis of Fracture Propagation Mechanisms

Author

Pierrick Rouset, Elmar Bonaccurso, Valérie Pommier-Budinger, Marc Budinger, Fabien Dezitter, Lokman Bennani, Airbus (FRANCE), Centre National de la Recherche Scientifique - CNRS (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut Clément Ader (ICA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Département de Mathématiques, Informatique, Automatique (DMIA), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), ONERA / DMPE, Université de Toulouse [Toulouse], ONERA-PRES Université de Toulouse, Airbus central R&T, AI research, Airbus Helicopters, Aeroport International de Marseille-Provence, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi)-Université Toulouse III - Paul Sabatier (UPS), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA), École nationale supérieure de l'aéronautique et de l'espace (SUPAERO), Ecole Nationale de l'Aéronautique et de l'Espace, Airbus [France], Airbus Groups Innovations, Institut Clément Ader ( ICA ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ) -IMT École nationale supérieure des Mines d'Albi-Carmaux ( IMT Mines Albi ) -Université Toulouse III - Paul Sabatier ( UPS ), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique ( CNRS ) -Institut National des Sciences Appliquées - Toulouse ( INSA Toulouse ), Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ), Institut Supérieur de l'Aéronautique et de l'Espace ( ISAE-SUPAERO ), ONERA - The French Aerospace Lab ( Toulouse ), ONERA, Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)

Subjects
Materials science, TENSILE STRESS, Modal analysis, SHEAR STRESS, Adhesive, Aerospace Engineering, 02 engineering and technology, Ice protection systems, 01 natural sciences, 010305 fluids & plasmas, Physics::Geophysics, Stress (mechanics), [SPI]Engineering Sciences [physics], 0203 mechanical engineering, [ SPI.NRJ ] Engineering Sciences [physics]/Electric power, 0103 physical sciences, Shear stress, Deicing, ELECTROMECHANICAL DE-ICING SYSTEMS, Automatique / Robotique, Stress intensity factor, Physics::Atmospheric and Oceanic Physics, Strain energy release rate, COHESIVE AND ADHESIVE FRACTURES, [PHYS]Physics [physics], 020301 aerospace & aeronautics, Ice protection system, [SPI.NRJ]Engineering Sciences [physics]/Electric power, PIEZOELECTRIC ACTUATORS, Cohesive, Fracture mechanics, Mechanics, Fracture, Fracture (geology), Astrophysics::Earth and Planetary Astrophysics, Energy release rate
Abstract

International audience; Recent research is showing growing interest in low-power electromechanical de-icing systems and, in particular, de-icing systems based on piezoelectric actuators. These systems use the vibrations generated by piezoelectric actuators at resonance frequencies to produce shear stress at the interface between the ice and the support or to produce tensile stress in the ice. This paper provides analytical and numerical models enabling a better understanding of the main de-icing mechanisms of resonant actuation systems. Different possible ice-shedding mechanisms involving cohesive and adhesive fractures are analyzed with an approach combining modal, stress, and crack propagation analyses. Simple analytical models are proposed to better understand the effects on ice shedding of the type of mode, ice thickness, or frequency with respect to cohesive and adhesive fractures.

Published
2018
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7. An implicit time marching Galerkin method for the simulation of icing phenomena with a triple layer model

Author

R. Chauvin, Pierre Trontin, Lokman Bennani, Philippe Villedieu, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), ONERA / DMPE, Université de Toulouse [Toulouse], and ONERA-PRES Université de Toulouse

Subjects
Computer science, Context (language use), 01 natural sciences, 7. Clean energy, 010305 fluids & plasmas, RUISSELLEMENT, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], FINITE ELEMENT METHOD, MODELING, 0103 physical sciences, NUMERICAL SIMULATION, 0101 mathematics, Galerkin method, Icing, METHODE ELEMENT FINI, Partial differential equation, Computer simulation, Applied Mathematics, General Engineering, Mechanics, Computer Graphics and Computer-Aided Design, ICING, MODELISATION, Finite element method, RUNBACK, 010101 applied mathematics, SIMULATION NUMERIQUE, GIVRAGE, Transient (oscillation), TRIPLE LAYER, Reduction (mathematics), TRIPLE COUCHE, Analysis
Abstract

International audience; In the context of more electrical aircraft and reduction of fuel consumption, aircraft manufacturers are moving towards more complex and transient ice protection systems. The operating of these systems involves several unsteady heat and mass transfer phenomena. Modelling and numerical simulation play an important role in the investigation of these unsteady phenomena. In this paper, a model for unsteady ice build-up and melting is presented. The model is based on a triple layer assumption. In addition, a tailored numerical methodology for solving the governing partial differential equations is also described. It is based on a Galerkin finite element method and a Gauss-Seidel like implicit time marching scheme. The global method is validated and its capabilities are demonstrated on several cases.

Published
2018
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8. Numerical simulation of unsteady dense granular flows with rotating geometries

Author

Olivier Simonin, Pascal Fede, Lokman Bennani, Hervé Neau, C. Baudry, J. Laviéville, Centre National de la Recherche Scientifique - CNRS (FRANCE), EDF (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), and Institut de Mécanique des Fluides de Toulouse - IMFT (Toulouse, France)

Subjects
Chemical process, Engineering, Granular flow, Computer simulation, business.industry, Stirred reactor, General Chemical Engineering, Mécanique des fluides, Unsteady, Industrial scale, Mechanical engineering, 02 engineering and technology, General Chemistry, Numerical simulation, 021001 nanoscience & nanotechnology, Numerical methodology, Frictional stress, 020401 chemical engineering, Homogeneity (physics), Rotating mesh, 0204 chemical engineering, 0210 nano-technology, business
Abstract

In chemical engineering applications, it is not uncommon to encounter reactors featuring rotating parts. As these rotating parts are present in order to enhance processes such as chemical reactions and/or ensure homogeneity, it is essential to take them into account to perform predictive numerical simulations. This aspect can be particularly challenging, even more so when complex industrial geometries are to be treated. In this paper a numerical methodology for simulating unsteady granular flow in rotating geometries is presented. The method is based on splitting the domain into static and rotating parts. The information between rotating and static parts is passed by a non-conformal mesh matching technique. The presented methodology is validated numerically by comparing its results with other conventional methods. The method is then applied to an industrial scale problem. The applicability of the method and the way it may be used to investigate complex flow is demonstrated. Therefore this approach enables to consider the full geometry of complex reactors. It opens the door to further investigation, optimization and design of industrial scale chemical processes.

Published
2017

9. A mixed adhesion–brittle fracture model and its application to the numerical study of ice shedding mechanisms

Author

Lokman Bennani, Michel Salaün, Philippe Villedieu, Centre National de la Recherche Scientifique - CNRS (FRANCE), Institut National Polytechnique de Toulouse - INPT (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE), Institut de mécanique des fluides de Toulouse (IMFT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées, ONERA - The French Aerospace Lab [Toulouse], ONERA, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Université de Toulouse (UT)-Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
Airfoil, Mechanical equilibrium, Materials science, 010504 meteorology & atmospheric sciences, Mécanique des fluides, 02 engineering and technology, Ice protection, 01 natural sciences, law.invention, [SPI.MECA.MEFL]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Fluids mechanics [physics.class-ph], 0203 mechanical engineering, law, Damage mechanics, Fracture mechanics, General Materials Science, Composite material, 0105 earth and related environmental sciences, Electro-thermal de-icing, Mechanical Engineering, Protection system, 020303 mechanical engineering & transports, Mechanics of Materials, Numerical modelling, Adhesive debonding, Algebraic model, Adhesive, Ice shedding, Brittle fracture
Abstract

International audience; The understanding of ice shedding is of prime importance in the assessment of aeronautical ice protection systems. In this paper, the authors previously studied mechanism is extended to include adhesive debonding. It is based on pressure redistribution in the water film formed at the ice/airfoil interface. The numerical modelling of crack propagation is based on recent work on damage mechanics which provides a general framework. As for adhesive debonding an algebraic model is derived from general mechanical equilibrium relations. Numerical experiments are performed to study an adhesive-debonding/brittle-failure mode detachment, the results of which are discussed.

Published
2016
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10. A robust coupling algorithm applied to thermal ice protection system unsteady modeling

Author

Lokman Bennani, Pierre Trontin, Rémi Chauvin, and Philippe Villedieu

Subjects
Coupling, Airfoil, Physics, Work (thermodynamics), Steady state, Heat flux, Heat equation, Solver, Thermal conduction, Algorithm
Abstract

The aim of the present paper is to propose a general methodology for the numerical modelling of both anti and de-icing systems. A lubrication model is used for dealing with the dynamics of the runback water film. As regards thermal effects, in order to take into account heat conduction and unsteadiness, a parabolic temperature profile is assumed with respect to the normal coordinate for the ice layer. Heat transfers in the airfoil solid structure are described using a dedicated solver based on the unsteady heat conduction equation. The most original contribution of this work is the new technique (herein referred to as the "improved Schwarz method") which is proposed for coupling in a robust way the accretion-runback model and the solid heat conduction model. This new coupling algorithm allows to ensure fast convergence of both temperature and heat flux at the coupling interface (airfoil outer surface) and can be used either for steady state computations (anti-icing mode) or unsteady computations (de-icing mode). Numerical test cases which have been performed so far are very promising and show the relevance of this new approach for real applications and 3D extension.

Published
2014
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11. Two dimensional model of an electro-thermal ice protection system

Author

Lokman Bennani, Michel Salaün, Philippe Villedieu, Airbus [France], ONERA - The French Aerospace Lab [Toulouse], ONERA, Institut Clément Ader (ICA), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Airbus (FRANCE), Ecole nationale supérieure des Mines d'Albi-Carmaux - IMT Mines Albi (FRANCE), Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE), Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE), Office National d'Etudes et Recherches Aérospatiales - ONERA (FRANCE), Université Toulouse III - Paul Sabatier - UT3 (FRANCE), Institut Clément Ader - ICA (Toulouse, France), Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Centre National de la Recherche Scientifique (CNRS)-IMT École nationale supérieure des Mines d'Albi-Carmaux (IMT Mines Albi), and Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)

Subjects
Aircraft, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Numerical simulation, 02 engineering and technology, GeneralLiterature_MISCELLANEOUS, Physics::Geophysics, 0203 mechanical engineering, Block (programming), Thermal, Aerospace engineering, Icing, Physics::Atmospheric and Oceanic Physics, Simulation, 020301 aerospace & aeronautics, ComputingMilieux_THECOMPUTINGPROFESSION, Computer simulation, Ice protection system, business.industry, Dimensional modeling, Thermique, Protection system, 020303 mechanical engineering & transports, Geography, De-icing, [SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph], Astrophysics::Earth and Planetary Astrophysics, business, Focus (optics)
Abstract

International audience; In this communication we shall focus on the main governing equations and building blocks of the M.A.D (Anti-icing Deicing Modelling) numerical tool, which is now renamed as INUIT (Integrated NUmerical model of Ice protection sysTems) and part of the new generation of ONERA icing codes. The code simulates the functioning of an electro-thermal de-icing system. We shall also discuss the various improvements and new features we have added, especially a mechanical model of the ice block in order to improve the ice-shedding criterion.

Published
2013
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