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Affichage de 731 à 740 sur 2097

Article dans une revue

Investigation of the dynamics in separated turbulent flow

Fawzi Fadla, Frédéric Alizard, Laurent Keirsbulck, Jean-Christophe Robinet, Jean-Philippe Laval, Jean-Marc Foucaut, Camila Chovet, Marc Lippert

Dynamical behavior of the turbulent channel flow separation induced by a wall-mounted two-dimensional bump is studied, with an emphasis on unsteadiness characteristics of vortical motions evolving in the separated flow. The present investigations are based on an experimental approach and Direct…

European Journal of Mechanics - B/Fluids, 2019, 76, pp.190-204. ⟨10.1016/j.euromechflu.2019.01.006⟩. ⟨hal-02331158⟩

Article dans une revue

Frequency coherence analysis of postural balance in able-bodied and in non-treated adolescent idiopathic scoliotic girls

Sebastien Leteneur, Sylvain Cremoux, Paul Allard, Emilie Simoneau-Buessinger, Nader Farahpour, Franck Barbier

Background: This study test if the frequency coherence calculated for the overall, low and high frequency bandwidths of the center of pressure excursions and free-moment calculated during standing balance are similar between scoliotic and non-scoliotic girls and if the coherence values within each…

Clinical Biomechanics, 2019, 67, pp.180-186. ⟨10.1016/j.clinbiomech.2019.05.012⟩. ⟨hal-03462893⟩

Article dans une revue

Sliding mode control applied to a square-back Ahmed body

Camila Chovet, Maxime Feingesicht, Baptiste Plumejeau, Marc Lippert, Laurent Keirsbulck, Franck Kerhervé, Andrey Polyakov, Jean-Pierre Richard, Wafik Abassi, Jean-Marc Foucaut

We consider the first closed-loop separation control experiment on an Ahmed body using a robust, model-based strategy called "sliding mode control" (SMC). The goal is to reduce and further maintain the aerodynamic drag of the square-back Ahmed body flow at Re h = 9 × 10 4 (based on the…

European Journal of Mechanics - B/Fluids, 2019, 81, pp.151-164. ⟨10.1016/j.euromechflu.2019.07.010⟩. ⟨hal-02422123⟩

Article dans une revue

A computational approach to design new tests for viscoplasticity characterization at high strain-rates

Pascal Bouda, Bertrand Langrand, Delphine Notta-Cuvier, Eric Markiewicz, Fabrice Pierron

Rate-dependent behaviour characterization of metals at high strain rate remains challenging mainly because of the strong hypotheses when tests are processed with statically determinate approaches. As a non-standard methodology, Image-Based Inertial Impact (IBII) test has been proposed to take…

Computational Mechanics, 2019, 64, pp.1639-1654. ⟨10.1007/s00466-019-01742-y⟩. ⟨hal-02293111⟩

Article dans une revue

Yet another low‐level agent handler

Fabrizio Nunnari, Alexis Heloir

YALLAH is a framework for the creation of real-time interactive virtual humans. Its production pipeline supports the continuous, parallel development of both the character and the software, and allows users for the deployment of a new character in a few hours of work. YALLAH is based on freely…

Computer Animation and Virtual Worlds, 2019, 30 (3-4), pp.1891. ⟨10.1002/cav.1891⟩. ⟨hal-03472139⟩

Article dans une revue

Do Older People Accurately Estimate the Length of Their First Step during Gait Initiation?

Delphine Caffier, Marion Luyat, Sylvain Cremoux, Christophe Gillet, Ghassan Ido, Franck Barbier, Janick Naveteur

Advancing age is associated with a decrease in step length. In line with previous studies showing that older adults often overestimate their motor abilities, we investigate whether older adults overestimate the length of their first step during gait initiation. The underlying effect could be a…

Exp Aging Res, 2019, Experimental aging research, 45 (4), pp.357-371. ⟨10.1080/0361073X.2019.1627495⟩. ⟨hal-03323910⟩

Article dans une revue

Influence of three different types of physical training programs on bone mineral density in a group of elderly subjects, Influence de trois différents types de programmes d'entraînement physique sur la densité minérale osseuse dans un groupe de sujets âgés

Riad Nasr, N. Rassy, Eric Watelain, S. Ishac, Obaida Abdul Al, Rawad El Hage

Introduction The aim of the present study was to explore the effect of resistance, endurance, and combined exercise training on bone mass in a group of elderly subjects. Summary of facts and results Fifty-two healthy elderly subjects (35 women and 17 men) whose ages range between 65 and 75 years…, Introduction Le but de cette étude était d’explorer l’effet de l’entraînement physique en résistance, endurance ou bien combiné (aérobie et résistance) sur la masse osseuse dans un groupe de sujets âgés. Synthèse des faits et résultats Cinquante-deux sujets sains (35 femmes et 17 hommes) âgés de 65…

Science & Sports, 2019, 34 (3), pp.186-189. ⟨10.1016/j.scispo.2019.01.004⟩. ⟨hal-03027982⟩

Article dans une revue

A novel DEM approach for modeling brittle elastic media based on distinct lattice spring model

Damien André, Jérémie Girardot, Cédric Hubert

The Discrete Element Method (DEM), also known as Distinct Element Method (DEM), is extensively used to study divided media such as granular materials. When brittle failure occurs in continuum such as concrete or ceramics, the considered media can be viewed as divided. In such cases, DEM offers an…

Computer Methods in Applied Mechanics and Engineering, 2019, 350, pp.100-122. ⟨10.1016/j.cma.2019.03.013⟩. ⟨hal-02136705⟩

Article dans une revue

Effect of self-rewetting fluids on the liquid/vapor phase change in a porous media of two-phase heat transfer devices

Riadh Boubaker, Souad Harmand, Safouene Ouenzerfi

This paper presents an experimental study of the phase change phenomenon in a porous medium. The tested working fluids are pure water and butanol aqueous solutions with different concentrations. In contrast to ordinary fluids, the surface tension of self-rewetting fluids exhibits a positive…

International Journal of Heat and Mass Transfer, 2019, 136, pp.655-663. ⟨10.1016/j.ijheatmasstransfer.2019.03.016⟩. ⟨hal-03609128⟩

Article dans une revue

Effect of hydroxyl (OH) group position in alcohol on performance, emission and combustion characteristics of SI engine

Devaraj Jesu Godwin, Edwin Geo Varuvel, Shanmugam Thiyagarajan, M. Leenus Jesu Martin, T. Maiyalagan, C. G. Saravanan, Fethi Aloui

In this research work, an attempt has been made to compare the performance and emission characteristics of n-butanol (n-B), iso-butanol (Iso-B), n-pentanol (P) and benzyl alcohol (Bn) with gasoline at various load conditions in the ratio of 10:90 by volume respectively, in a 2 cylinder SI test…

Energy Conversion and Management, 2019, 189, pp.195-201. ⟨10.1016/j.enconman.2019.03.063⟩. ⟨hal-03612692⟩