0000000001026195

AUTHOR

Arthur Da Silva

showing 10 related works from this author

Etude Piv De L'évolution Instationnaire De L'écoulement Entourant Un Véhicule Soumis À Un Vent Latéral.

2020

Les techniques de PIV résolue en temps et de PIV stéréoscopique sont appliquées autour de corps automobiles soumis à un coup de vent latéral. Ainsi, l’évolution instationnaire des efforts aérodynamiques peut être interprétée en lien avec la topologie de l’écoulement. On montre en particulier que la réponse instationnaire du véhicule est dominée par le transitoire de la partie arrière. Le développement de la structure tourbillonnaire d’axe longitudinal apparaissant du côté sous le vent du véhicule soumis à un dérapage apparaît jouer un rôle important dans la réponse instationnaire de efforts aérodynamiques.

[SPI] Engineering Sciences [physics]
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A Space-Time Meshless Method for Heat Transfer Problems With High Discontinuities

2013

The aim of this research is the development of a space-time driscretization method based on Diffuse Approximation Meshless method. This method, devoted to transient heat transfer problems presenting high temporal discontinuities, avoids any Finite-Difference time stepping procedure. The space-time discretization proposed here seems to be convenient for continuous transient heat transfer. Nevertheless, for problems including temporal discontinuities, some spurious oscillations, whose amplitudes depend on source power, appear. A new weight function respecting the principle of causality, based on a modification of the involved node’s selection and a normalisation of the distances, is developed…

ConvectionPhysicsWeight functionDiscretizationSpace timeMathematical analysisHeat transferNode (circuits)Classification of discontinuitiesConstant (mathematics)Volume 4: Heat and Mass Transfer Under Extreme Conditions; Environmental Heat Transfer; Computational Heat Transfer; Visualization of Heat Transfer; Heat Transfer Education and Future Directions in Heat Transfer; Nuclear Energy
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An alternative space-time meshless method for solving transient heat transfer problems with high discontinuous moving sources

2016

International audience; The aim of this work is the development of a space-time diffuse approximation meshless method (DAM) to solve heat equations containing discontinuous sources. This work is devoted to transient heat transfer problems with static and moving heat sources applied on a metallic plate and whose power presents temporal discontinuities. The space-time DAM using classical weight function is convenient for continuous transient heat transfer. Nevertheless, for problems including discontinuities, some spurious oscillations for the temperature field occur. A new weight function, respecting the principle of causality, is used to eradicate the physically unexpected oscillations.

[ SPI.MECA.GEME ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]Work (thermodynamics)Weight functionField (physics)finite element method02 engineering and technologyClassification of discontinuitieselasto-dynamic problems01 natural sciences[SPI]Engineering Sciences [physics]0203 mechanical engineering[ SPI ] Engineering Sciences [physics]free galerkin methodrefinement0101 mathematicsconvectionMathematicsNumerical AnalysisSpace timeMechanicsCondensed Matter Physics[ SPI.MECA.THER ] Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph][SPI.MECA.GEME]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Mechanical engineering [physics.class-ph]Computer Science ApplicationsPower (physics)010101 applied mathematics020303 mechanical engineering & transportsClassical mechanicsMechanics of MaterialsModeling and Simulation[SPI.MECA.THER]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Thermics [physics.class-ph]Heat equationDevelopment (differential geometry)
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Simulation de l'écoulement de vent et de son contrôle autour d'un objet de géométrie d'un immeuble

2018

International audience

[SPI]Engineering Sciences [physics][SPI] Engineering Sciences [physics]ComputingMilieux_MISCELLANEOUS
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Forces and flow structures evolution on a car body in a sudden crosswind

2014

A vehicle driver is commonly exposed to strong side air flows, for example when passing through a wind gust. The aerodynamic efforts generated in these situations may induce undesired lateral deviations, which can lead to dramatic effects, if the driver is surprised. In order to simulate a sudden yaw angle change on a moving vehicle, a double wind tunnel facility, adapted from the one of Ryan, Dominy, 2000. Wake Surveys Behind a Passenger Car Subjected to a Transient Cross-wind Gust. SAE Technical Paper No. 2000-01-0874 is developed. Two Windsor car body models, differing from their rear geometry, are analysed. The transient evolution of the side force and yaw moment aerodynamic coefficient…

EngineeringUnsteady aerodynamicsMeteorologyMécanique des fluidesFlow (psychology)WakeRoad vehiclessymbols.namesakeUnsteady effortsCivil and Structural EngineeringWind tunnelRenewable Energy Sustainability and the Environmentbusiness.industryMechanical EngineeringAerodynamicsMechanicsMécaniqueVorticesVortexEuler anglesPIVsymbolsTransient (oscillation)Unsteady crosswindbusinessCrosswindJournal of Wind Engineering & Industrial Aerodynamics
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Wind flow simulation and control around a building shape body

2018

International audience

[SPI]Engineering Sciences [physics][SPI] Engineering Sciences [physics]ComputingMilieux_MISCELLANEOUS
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Validation d'un banc d'essais reproduisant les rafales de vent sur véhicule terrestre. Caractérisation de l'écoulement par TR-PIV

2011

National audience; Les phénomènes aérodynamiques instationnaires apparaissant autour de véhicules terrestres lors de rafales latérales, demeurent encore mal connus de par les difficultés, tant expérimentales que numériques, à reproduire fidèlement ces situations en laboratoire. L’ISAE a développé un banc d'essai, inspiré des travaux de Ryan et Dominy (Ryan et Dominy [2000]), dans lequel le déferlement de la rafale sur la maquette automobile est reproduit par un jet latéral mobile longitudinalement. L’écoulement généré par ce dispositif est validé PIV résolue en temps dans ce présent document. L’angle de dérapage obtenu lors d’une simulation de rafale présente une évolution temporelle proche…

TR-PIV[SPI]Engineering Sciences [physics][SPI] Engineering Sciences [physics]Mécanique des fluidesVent traversierAérodynamique instationnaireAérodynamique automobile
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Experimental and Numerical Validation of a Wind Gust Facility

2013

The study of a vehicle moving through a lateral wind gust has always been a difficult task due to the difficulties in granting the right similitude. The facility proposed by Ryan and Dominy has been one of the best options to carry it out. In this approach, a double wind tunnel is used to send a lateral moving gust on a stationary model. Using this idea as a starting point, the ISAE has built a dedicated test bench for lateral wind studies on transient conditions. Experimental work has been carried out by means of time-resolved PIV, aiming at studying the unsteady interpenetration of the two flows coming from each wind tunnel. Meanwhile, a 3D CFD model based on URANS was set up, faithfully …

CrosswindTest benchMeteorologybusiness.industryComputer scienceTurbulenceMécanique des fluidesMechanical EngineeringComputational fluid dynamicsGustSimilitudeExperimentalPoint (geometry)Transient (oscillation)businessWind tunnelMarine engineeringWind tunnelCrosswindJournal of Fluids Engineering
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Stratégie adaptative de la gestion énergétique d'un véhicule hybride | 20ème Cycle 'Utilisation rationnelle de l'énergie et environnement'

2019

National audience; Le plan climat lancé par le gouvernement français impose la fin de la vente des véhicules à propulsion thermique à l’échéance de 2040. Les solutions alternatives reposent en grande partie sur l’électrification des véhicules, nécessitant un réseau de production électrique adapté et dimensionné, ainsi qu’une infrastructure pour la distribution.Des solutions de transition sont proposées par les constructeurs afin de réduire les émissions de pollutions sans réduire les performances des véhicules. L’une d’entre elles repose sur l’hybridation, c'est-à-dire, l’utilisation d’un moteur thermique associé à un moteur électrique.Les travaux présentés portent sur le développement d’un…

[SPI]Engineering Sciences [physics][SPI] Engineering Sciences [physics]
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Numerical investigation of boundary layer detachment by active flow control

2014

International audience; After decades of investigations have failed to produce a positive outcome on flow control technologies that requires complex devices and micro-plumbing, recent technologies like synthetic jets, DBD (Dielectric Barrier Discharge) seems to be promising and these technologies can overcome limitations of the old ones. Our work mainly deals with delaying boundary layer detachment of over an aerodynamic body (Air foil). In this paper we produce our study of an active flow control device over the BL detachment point over a circular cylinder by the aid of simulations. Results from the uncontrolled flow seem to be in accordance with literature and the presence of the jet has …

[SPI]Engineering Sciences [physics][SPI] Engineering Sciences [physics]
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