Jocelyn Étienne

• A. Jallon, P. Recho, and J. Étienne, 2024
  Mechanics and thermodynamics of contractile entropic biopolymer networks
  arXiv preprint.
• J. Étienne and P. Recho, 2024
  Initiation of motility on a compliant substrate
  J. Mech. & Phys. Solids 183:105526
  arXiv:2303.09666 (post-print)
• A. Nestor-Bergmann, G. B. Blanchard, N. Hervieux, A. G. Fletcher, J. Étienne, and B. Sanson, 2022
  Adhesion-regulated junction slippage controls cell intercalation dynamics in an Apposed-Cortex Adhesion Model
  PLOS Comput. Biol. 18(1):e1009812
  The corresponding python code is distributed as an open-source free software
  
• H. Chelly, A. Jahangiri, M. Mireux, J. Étienne, D.K. Dysthe, C. Verdier and P. Recho, 2022
  Cell crawling on a compliant substrate: a biphasic relation with linear friction
  Int. J. Non-Linear Mech 139:103897
  Special issue–Nonlinear mechanics: the driving force of modern applied and industrial mathematics (in honour of Luigi Preziosi)
  arχiv:2112.09997 (postprint)
• J. Fierling, A. John, B. Delorme, A. Torzynski, G. B. Blanchard, C. M. Lye, Anna Popkova, Grégoire Malandain, B. Sanson, J. Étienne, P. Marmottant C. Quilliet, and M. Rauzi, 2022
  Embryo-scale epithelial buckling forms a propagating furrow that initiates gastrulation
  Nature Comms. 13:3348
  Experimental and numerical data, Surface Evolver script · Highlighted in Development
• A. Erlich, J. Étienne, J. Fouchard and Tom Wyatt, 2022
  Review: How dynamic prestress governs the shape of living systems, from the subcellular to tissue scale
  Interface Focus 12(6):058101
  arXiv:2209.01440 (postprint)
• L. F. Lang, N. Dutta, E. Scarpa, B. Sanson, C.-B. Schönlieb and J. Étienne, 2021
  Joint motion estimation and source identification using convective regularisation with an application to the analysis of laser nanoablations
  Springer book on Time-dependent Problems in Imaging and Parameter Identification, bioRxiv:686261
  Experimental data · Code
• G. B. Blanchard, J. Étienne and N. Gorfinkiel, 2018
  From pulsatile apicomedial contractility to effective epithelial mechanics 
  Current Opinion in Genetics & Development 51:78–87. ⇒ publisher's website
• M. Dicko, P. Saramito, G. B. Blanchard, C. M. Lye, B. Sanson and J. Étienne, 2017
  Geometry can provide long-range mechanical guidance for embryogenesis
  PLOS Comput. Biol. 13(3):e1005443
• C. Roux, A. Duperray, V. Laurent, R. Michel, V. Peschetola, C. Verdier and J. Étienne, 2016
  Prediction of traction forces of motile cells  
  Interface Focus 6:20160042. ⇒ publisher's website
  
• J. Étienne, J. Fouchard, D. Mitrossilis, N. Bufi, P. Durand-Smet and A. Asnacios, 2015
  Cells as liquid motors: Mechanosensitivity emerges from collective dynamics of actomyosin cortex  
  Proc. Natl. Acad. Sci. USA 112(9):2740–2745. ⇒ publisher's website
  My webpage devoted to this research
• P. F. Machado, J. Duque, J. Étienne, A. Martinez-Arias, G. B. Blanchard and N. Gorfinkiel, 2015
  Emergent material properties of developing epithelial tissues
  BMC Biology, “Beyond Mendel: modeling in biology” series, 13:98 ⇒ publisher's website
• J. Étienne and A. Duperray, 2011
  Initial dynamics of cell spreading are governed by dissipation in the actin cortex  
  Biophys. J. 101(3):611–622. ⇒ publisher's website
  Supplements, Movie of a cell spreading with its central, high fluorescence region highlighted  
  
• J. Étienne, E. J. Hinch, J. Li, 2006
  A Lagrangian-Eulerian approach for the numerical simulation of free-surface flow of a viscoelastic material  
  J. Non-Newtonian Fluid Mech. 136:157–166. ⇒ publisher's website
• J. Étienne, P. Saramito, 2005
  A priori error estimates of the Lagrange-Galerkin method for Kazhikhov-Smagulov type systems  
  C. R. Mathématiques 341:769–774

• F. Fage, S. Asnacios, A. Pluta, A. Richert, C. Vias, J. Fouchard, H. Enslen, J. Etienne, A. Callan-Jones, M. Thery, D. Pereira, A. Asnacios, 2024
  Disentangling the contributions of stress fibres and the unbundled actin meshwork to the anisotropy of cortical tension in response to cell shape
  bioRxiv preprint
• S. Bouizakarne, J. Étienne, and A. Nicolas, 2023
  Impact of baculoviral transduction of fluorescent actin on cellular forces
  Eur J Cell Biol 102(2):151294
• A. Pacquelet, M. Jousseaume, J. Étienne, and G. Michaux, 2019
  Simultaneous regulation of cytokinetic furrow and nucleus positions by cortical tension contributes to proper DNA segregation during late mitosis
  Current Biology 29(22):3766-3777.e4, bioRxiv:626903
• A. Farutin, J. Étienne, C. Misbah and P. Recho, 2019
  Crawling in a fluid
  Phys. Rev. Lett. 123:118101, arχiv:1902.01730
• G. Vitale, L. Laforgue, R. Michel, J. Étienne, V.M. Laurent, A. Duperray and C. Verdier, 2014
  3D migration of cells solving an inverse problem  
  Inverse Problems – from Theory to Applications (IPTA2014), 69-73
• R. Michel, V. Peschetola, J. Étienne, A. Duperray, G. Vitale, D. Ambrosi, L. Preziosi and C. Verdier, 2013
  Mathematical framework for Traction Force Microscopy  
  ESAIM Proceedings 42:61-83.
• R. Michel, V. Peschetola, B. Bedessem, J. Étienne, D. Ambrosi, A. Duperray, C. Verdier, 2012
  Inverse problems for the determination of traction forces by cells on a substrate: a comparison of two methods  
  Comput. Methods Biomechanics Biomed. Eng 15(S1):27-29.
• C. Verdier, J. Étienne, A. Duperray, and L. Preziosi, 2009
  Review. Rheological properties of biological materials,
  C. R. Physique 10(8):790–811. ⇒ publisher's website
• R. Bendick, D. McKenzie, J. Étienne, 2008
  Topography associated with crustal flow in a convergent regime
  Geophys. J. Int. 175:375–385. ⇒ publisher's website
• J. Étienne, M. Rastello, E. J. Hopfinger, 2006
  Modelling and simulation of powder-snow avalanches
  C.R. Mécanique 334:545–554
• J. Étienne, E. J. Hopfinger, P. Saramito, 2005
  Numerical simulations of high density ratio lock-exchange flows  
  Phys. Fluids 17(3), 036601 ⇒ publisher's website
• J. Étienne, P. Saramito, E. J. Hopfinger, 2004
  Numerical simulation of dense clouds on steep slopes: application to the powder-snow avalanches  
  Annals Glaciol. 38, 379–383
  

Numerical simulation of high density ratio gravity currents.
Application to the avalanches.

PhD Thesis, Institut National Polytechnique de Grenoble, September 2004

Flows of binary mixtures of incompressible, miscible fluids of very large density difference are considered. These flows are governed by the non-homogeneous Navier-Stokes equations, coupled with a convection-diffusion equation governing the evolution of the mixture composition. We present an algorithm that combines the method of characteristics, for the transport terms discretization, and the finite elements method with automatic mesh adaptation, and we prove that the solution obtained converges to the exact solution as the mesh and time steps go to zero. The robustness of this algorithm enables us to perform the first direct numerical simulations of lock-exchange flows with high density ratios, and to validate them by comparison with experiments. Dense cloud flows on slopes are also simulated, allowing to analyse the influence of the density ratio on the powder-snow avalanche flows.

Jury: M. Olivier PIRONNEAU, M. Jean-Paul VILA (reviewers), Mme Valérie PERRIER, M. Stéphane ZALESKI (examiners), M. Pierre SARAMITO, M. Emil HOPFINGER (PhD advisors).

the manuscript [in French, 3.5MB].