• CONFERENCIAS

    DEPARTAMENTO DE CONSTRUCCIONES Y ESTRUCTURAS
    Av. Las Heras 2214 - Planta Baja - C1127AAR - Buenos Aires.
    E-mail: cyefiuba@gmail.com  o   depto.cye@fi.uba.ar


    CONFERENCIAS LUNES 04 DE NOVIEMBRE 2024
    16:30 hs Dr.     Daniel van Huyssteen
    17:30 hs. Prof. Dr. Paul Steinmann

    17:30 hs - CONFERENCIA a cargo del Prof. Dr. Paul Steinmann
    Institute of Applied Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg
    “In the treadmill: the weirdness of flow-immersed soft particles”
    Authors: Paul Steinmann, Jana Wedel, Matjaz Hribersek, Jure Ravnik

    Abstract: Flows of particles suspended in fluids remain a challenge in various branches of science and engineering. This is especially true for particles in the micron-size range, since there the complexity and cost of experimental techniques and corresponding computational models of particle-fluid interactions is highly demanding.
    In this presentation, we will focus on novel computational models for tracking the motion and deformation of large numbers of micron-sized soft, i.e. highly deformable, non-spherical particles in fluid flows. We will discuss particles with a variety of rheological properties allowing a prominent change in the particle’s geometry. Thereby, we will dedicate special attention to the pertinent force and torque models for particle-fluid translational and angular momentum exchange. As a result, we will especially focus on the tank-treading phenomenon displayed by flow-immersed soft particles.

     

    16:30 hs - Presentación a cargo del Dr. Daniel van Huyssteen
    Institute of Applied Mechanics, Friedrich-Alexander-Universität Erlangen-Nürnberg
    “Quasi-optimal adaptive remeshing procedures for the Virtual Element Method”
    Authors Daniel van Huyssteen, Felipe L. Rivarola, Guillermo Etse and Paul Steinman

    Abstract. The virtual element method (VEM) is a recent extension of the finite element method for generating approximate solutions to problems posed as systems of partial differential equations. In this work the VEM is applied to solid mechanics problems for the case of linear elastic materials. The VEM permits arbitrary polygonal element geometry in two dimensions. This mesh flexibility means that the VEM is well-suited to problems involving adaptive mesh remeshing. However, the VEM function spaces are defined such that quantities are only explicitly known on element edges. Thus, the well-known approaches to mesh adaptivity developed for finite elements cannot be directly applied to problems involving the VEM.
    In this work an energy error estimation has been implemented using a super-convergent patch recovery procedure. Using this error estimator elements are flagged for refinement or coarsening. The refinement ( van Huyssteen et al. 2022) and coarsening ( van Huyssteen et al. 2024) of the elements is performed using novel remeshing procedures that are suitable for the arbitrary polygonal element geometries permitted by the VEM. The proposed adaptive remeshing procedure is motivated by seeking to meet a user-defined accuracy target while simultaneously generating a quasi-even distribution of error across the elements. Thus, generating a quasi-optimal mesh. The efficacy of the proposed procedure is demonstrated through a set of numerical investigations.

     

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