Thursday 15th October 2026 Kinetic theory analysis of a lid-driven cavity flow of a gas: behavior of the gas near sharp corners ESILV, Salle de réunion Elinor Ostrom (K101)

• Kinetic theory analysis of a lid-driven cavity flow of a gas: behavior of the gas near sharp corners

  Masanari HATTORI (Kyoto University) [description]
  A gas flow in a two-dimensional square cavity driven by a lid is considered. It is known that, in this problem, the Stokes equations under the no-slip condition predict an infinite series of corner vortices near the lower corners, flow velocity with direction-dependent limiting values at the upper corners, and stress and pressure that diverge inversely with the distance from the upper corners. We examine how these properties are modified or retained within the kinetic theory of gases. The steady behavior of the gas is numerically investigated based on the linearized Bhatnagar-Gross-Krook kinetic equation and the diffuse reflection boundary condition. No corner vortices are observed for k >= 0.03, where k = (sqrt{pi}/2)Kn with Kn being the Knudsen number, the ratio of the mean free path to the cavity size. A first corner vortex is observed at k = 0.02 and for smaller k, and a second one is observed at k = 0.001 and for smaller k. These results imply that the number of vortices is finite for each finite Knudsen number. Macroscopic quantities, including the flow velocity, exhibit direction-dependent limiting values also within kinetic theory. For moderate to large Knudsen numbers, such direction dependence manifests itself even at the lower corners. The stress and pressure vary inversely with the distance from the upper corners up to a few tens of mean free paths. Their increase is suppressed at positions closer to the corners and they remain bounded. Consequently, the total forces acting on the lid and side cavity walls are also finite, and they exhibit an unconventional scaling Kn ln Kn for small Kn. These properties imply that kinetic theory regularizes the divergent behavior near the corners predicted by macroscopic fluid mechanics

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3rd and 4th June 2026 CoBeCoSy 2026 Campus de l'Arche, 47 Boulevard de Pesaro, 92000 Nanterre

• The Fluid Seminars of April and May were regrouped on the CoBeCoSy conference (June 3rd-4th)

  (https://conferences.dvrc.fr/CoBeCoSy26/index.php) [description]
  https://conferences.dvrc.fr/CoBeCoSy26/index.php

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Tuesday 24th March 2026 Nonlinear wave-particle interaction in plasmas ESILV, E311

• Nonlinear wave-particle interaction in plasmas

  Eleonora SIDA (University of Pavia, Italy & DVRC) [description]
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Thursday 19th February 2026 LES-Quality Urban Wind & NFZ Mapping via Multi-Fidelity Learning ESILV, L519

• LES-Quality Urban Wind & NFZ Mapping via Multi-Fidelity Learning

  Jinan CHARAFEDDINE & Aminallah RABIA (DVRC-Paris) [description]
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Thursday 4th December 2025 Continuum limit of shell models for fluid and plasma turbulence. ESILV, L519

• Continuum limit of shell models for fluid and plasma turbulence.

  Pierre MOREL (Laboratory of Plasma Physics, Palaiseau, France) [description]
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Thursday 2nd October 2025 Particle-in-cell simulations of magnetic fusion plasmas. ESILV, L519

• Particle-in-cell simulations of magnetic fusion plasmas.

  Alberto BOTTINO (Max-Planck-Institute, Germany) [description]
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Thursday 12th June 2025 Lagrangian dispersion in surface ocean turbulence: from quasi-geostrophy to internal waves. ESILV, L519

• Lagrangian dispersion in surface ocean turbulence: from quasi-geostrophy to internal waves.

  Stefano BERTI (University, Lille, FRANCE) [description]
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Thursday 22nd May 2025 Network formulation of turbulence ESILV, L519

• Network formulation of turbulence

  Ozgur GURCAN (Laboratoire de Physique de Plasmas, Palaiseau, FRANCE) [description]
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Tuesday 1st April 2025 The Sun, a particle accelerator: what can radio teach us? ESILV, L519

• The Sun, a particle accelerator: what can radio teach us?

  Carine BRIAND (Observatoire de Paris - Meudon) [description]
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Thursday 27th March 2025 Le nuage d'orage et sa prévision ESILV, L519

• Le nuage d'orage et sa prévision

  Aurelie BOUCHARD (ONERA, FRANCE) [description]
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Thursday 6th March 2025 Contributions to the Numerical Analysis of Fluid Mechanics Problems using Navier Stokes Equations ESILV, L519

• Contributions to the Numerical Analysis of Fluid Mechanics Problems using Navier Stokes Equations

  Driss YAKOUBI (DVRC-Paris) [description]
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Thursday 6th February 2025 Classical diffusion with quantum interfaces: application to graphene heterostructures. ESILV, L519

• Classical diffusion with quantum interfaces: application to graphene heterostructures.

  Luigi BARLETTI (Univ. Florence, Italy) [description]
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Thursday 19th December 2024 Effects of energetic particles on acoustic modes in ITER-like plasma regimes. ESILV, L519

• Effects of energetic particles on acoustic modes in ITER-like plasma regimes.

  Didier GOSSARD (ESILV, FRANCE) [description]
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Thursday 14th November 2024 Digital evaluation of aerodynamic performance. ESILV, L519

• Digital evaluation of aerodynamic performance.

  Soumendu BANIK (ESILV) [description]
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Thursday 3rd October 2024 An Improved Arrow-Hurwicz Method for Incompressible Flow Equations. ESILV, L519

• An Improved Arrow-Hurwicz Method for Incompressible Flow Equations.

  Aziz Takhirov (Univ. of Sharjah, United Arab Emirates) [description]
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Thursday 30th May 2024 Structure-preserving Finite Elements for fluid and kinetic models. ESILV, L519

• Structure-preserving Finite Elements for fluid and kinetic models.

  Martin CAMPOS-PINTO (Max-Planck-Institute, Germany) [description]
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Thursday 18th April 2024 Numerical Analysis of Coupling and Phase Change Problems in Fluid Mechanics. ESILV, L519

• Numerical Analysis of Coupling and Phase Change Problems in Fluid Mechanics.

  Driss YAKOUBI (DVRC-Paris) [description]
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Thursday 8th February 2024 From medical data to digital models of cerebral venous flow. ESILV, L519

• From medical data to digital models of cerebral venous flow.

  Stéphanie SALMON (University of Reims) [description]
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Thursday 7th December 2023 Surface characterization for ice slurry generation using liquid jets. ESILV, L519

• Surface characterization for ice slurry generation using liquid jets.

  Walid SAMAH (DVRC-Paris) [description]
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Thursday 23rd November 2023 How to improve the performance and use of cardiac assist devices? ESILV, L519

• How to improve the performance and use of cardiac assist devices?

  Mathieu SPECKLIN (CNAM-Paris) [description]
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Thursday 26th October 2023 Computational fluid dynamics simulations of drone flight in the city. ESILV, L519

• Computational fluid dynamics simulations of drone flight in the city.

  Chaozhen LI (INSTA-Toulouse and DVRC) [description]
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Thursday 21st September 2023 Natural convection in three-dimensional air-filled cavities. ESILV, L519

• Natural convection in three-dimensional air-filled cavities.

  Didier GOSSARD (ESILV-Paris) [description]
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Monday 10th July 2023 Waves and instabilities in magnetic confinement fusion experiments and space plasmas. ESILV, L519

• Waves and instabilities in magnetic confinement fusion experiments and space plasmas.

  Zhiwei MA (Zhejiang University) [description]
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Wednesday 28th June 2023 Overview of the hydrogen applications in the energy sector. ESILV, L519

• Overview of the hydrogen applications in the energy sector.

  Tommaso CAPURSO (ENSAM-Paris) [description]
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Thursday 15th June 2023 Geodesic acoustic modes in tokamak plasmas. ESILV, L519

• Geodesic acoustic modes in tokamak plasmas.

  Alessandro BIANCALANI (DVRC-Paris) [description]
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Thursday 11th May 2023 Effect of atmospheric turbulence on modulational instability in laser-pulse propagation. ESILV, L519

• Effect of atmospheric turbulence on modulational instability in laser-pulse propagation.

  Alain BOURDIER (University of New Mexico) [description]
  Fermer

Thursday 20th April 2023 Kinetic theory of plasmas. ESILV, L519

• Kinetic theory of plasmas.

  Alessandro BIANCALANI (DVRC-Paris) [description]
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Thursday 23rd March 2023 Study of magnetic confinement fusion plasmas via numerical simulations. ESILV, L519

• Study of magnetic confinement fusion plasmas via numerical simulations.

  Juvert Njeck SAMA (University of Lorraine at Nancy) [description]
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Thursday 9th March 2023 Dérivation de quelques modèles asymptotiques en océanographies. ESILV, L519

• Dérivation de quelques modèles asymptotiques en océanographies.

  Raafat TALHOUK (DVRC-Paris) [description]
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Thursday 9th February 2023 Magneto-Hydro-Dynamic waves. ESILV, L519

• Magneto-Hydro-Dynamic waves.

  Alessandro BIANCALANI (DVRC-Paris) [description]
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Thursday 19th January 2023 Dynamics of the wind in the city. ESILV, L519

• Dynamics of the wind in the city.

  Aminallah RABIA (ESILV-Paris) [description]
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