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Ara es mostren els items 21-40 de 116

    • A shifted boundary method based on extension operators 

      Zorrilla Martínez, Rubén; Rossi, Riccardo; Scovazzi, Guglielmo; Canuto, Claudio; Rodríguez Ferran, Antonio (Elsevier, 2024-03)
      Article
      Accés obert
      We consider formulations of the Shifted Boundary Method based on extrapolation operators other than the Taylor expansion. In the specific case of the Poisson equation, we prove that this approach is stable, provided some ...

    • A stabilised displacement–volumetric strain formulation for nearly incompressible and anisotropic materials 

      Rossi, Riccardo; Zorrilla Martínez, Rubén; Codina, Ramon (2021-04)
      Article
      Accés obert
      The simulation of structural problems involving the deformations of volumetric bodies is of paramount importance in many areas of engineering. Although the use of tetrahedral elements is extremely appealing, tetrahedral ...

    • A stabilized mixed implicit Material Point Method for non-linear incompressible solid mechanics 

      Iaconeta, Ilaria; Larese De Tetto, Antonia; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (Springer, 2019-06)
      Article
      Accés obert
      In this work a stabilized mixed formulation for the solution of non-linear solid mechanics problems in nearly-incompressible conditions is presented. In order to deal with high material deformation, an implicit Material ...

    • A time averaged steady state method for the Navier-Stokes equations 

      Zhao, Mengjie; Zorrilla Martínez, Rubén; Rossi, Riccardo; Wüchner, Roland (2021-07)
      Article
      Accés obert
      This work derives an incompressible Variational Multiscales time-averaged Navier-Stokes formulation that aims at obtaining accurate steady state solutions. Rather than using the standard time instantaneous velocity and ...

    • A transonic potential solver with an embedded wake approach using multivalued finite elements 

      López Canalejo, Iñigo; Baez Jones, Eloisa; Núñez Corbacho, Marc; Zorrilla Martínez, Rubén; Rossi, Riccardo; Bletzinger, Kai Uwe; Wüchner, Roland (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
      Comunicació de congrés
      Accés obert
      A potential transonic solver with an embedded wake is presented. The flow outside of attached boundary layers of streamlined bodies flying at high Reynold numbers can be assumed to be irrotational and isentropic. This ...

    • A two-step monolithic method for efficient simulation of incompressible flows 

      Ryzhakov, Pavel; Cotela Dalmau, Jordi; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (2014-04)
      Article
      Accés restringit per política de l'editorial
      We propose a simple technique for improving computational the e ciency of monolithic velocity-pressure solvers for incompressible ow problems. The idea consists in solving the discrete non-linear system of governing ...

    • A two-step monolithic method for the efficient simulation of incompressible flows 

      Ryzhakov, Pavel; Cotela Dalmau, Jordi; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (2014-01)
      Article
      Accés restringit per política de l'editorial
      We propose a simple technique for improving computationally the efficiency of monolithic velocity–pressure solvers for incompressible flow problems. The idea consists in solving the discrete nonlinear system of governing ...

    • Adaptive and off-line techniques for non-linear multiscale analysis 

      Zaghi, Stefano; Martínez García, Javier; Rossi, Riccardo; Petracca, Massimo (2018-08-22)
      Article
      Accés obert
      This paper presents two procedures, based on the numerical multiscale theory, developed to predict the mechanical non-linear response of composite materials under monotonically increasing loads. Such procedures are designed ...

    • Advanced solid elements for sheet metal forming simulation 

      Mataix, Vicente; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio; Flores, Fernando G (Institute of Physics (IOP), 2016)
      Text en actes de congrés
      Accés obert
      The solid-shells are an attractive kind of element for the simulation of forming processes, due to the fact that any kind of generic 3D constitutive law can be employed without any additional hypothesis. The present work ...

    • Advances in the particle finite element method (PFEM) for solving coupled problems in engineering 

      Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Celigueta Jordana, Miguel Ángel; Rossi, Riccardo; Martí, Julio Marcelo; Carbonell Puigbó, Josep Maria; Ryzhakov, Pavel; Suárez Arroyo, Benjamín (Springer, 2011)
      Capítol de llibre
      Accés restringit per política de l'editorial
      We present some developments in the formulation of the Particle Finite Element Method (PFEM) for analysis of complex coupled problems on fluid and solid mechanics in engineering accounting for fluid-structure interaction ...

    • Advances in the particle finite element method for FSI: a modified fractional step approach 

      Ryzhakov, Pavel; Oñate Ibáñez de Navarra, Eugenio; Rossi, Riccardo; Idelsohn, Sergio (CIMNE, 2011)
      Text en actes de congrés
      Accés obert
      The Particle Finite Element Method was originally developed for applications involving incompressible fluids containing free surfaces. The PFEM’s fundamental features include a) updated Lagrangian description b) nodal storage ...

    • An efficient edge-based level set finite element method for free surface flow problems 

      Rossi, Riccardo; Larese De Tetto, Antonia; Dadvand, Pooyan; Oñate Ibáñez de Navarra, Eugenio (2013-02)
      Article
      Accés restringit per política de l'editorial
      We present an efficient technique for the solution of free surface flow problems using level set and a parallel edge-based finite elementmethod. An unstructured semi-explicit solution scheme is proposed. A custom data ...

    • An embedded approach for the solution of the full potential equation with finite elements 

      Núñez Corbacho, Marc; Lopez, Iñigo; Baiges Aznar, Joan; Rossi, Riccardo (2022-01)
      Article
      Accés obert
      Recent developments in numerical simulations in the aerodynamics field are focused on reducing the computational cost of the solvers, targeting their use at the initial design steps. Under the right assumptions, potential ...

    • An embedded Finite Element framework for the resolution of strongly coupled Fluid–Structure Interaction problems: application to volumetric and membrane-like structures 

      Zorrilla Martínez, Rubén; Rossi, Riccardo; Wüchner, Roland; Oñate Ibáñez de Navarra, Eugenio (2020-08)
      Article
      Accés obert
      This work presents a Fluid–Structure Interaction framework for the robust and efficient simulation of strongly coupled problems involving arbitrary large displacements and rotations. We focus on the application of the ...

    • An enhanced non-oscillatory BFECC algorithm for finite element solution of advective transport problems 

      Hashemi, Mohammad Reza; Rossi, Riccardo; Ryzhakov, Pavel (2022-03)
      Article
      Accés obert
      In this paper, the so-called “back and forth error compensation correction (BFECC)” methodology is utilized to improve the solvers developed for the advection equation. Strict obedience to the so-called “discrete maximum ...

    • An enriched finite element/level-set method for simulating two-phase incompressible fluid flows with surface tension 

      Hashemi, Mohammad Reza; Ryzhakov, Pavel; Rossi, Riccardo (2020-10)
      Article
      Accés obert
      A finite element method is introduced to simulate surface tension dominated flow of two immiscible fluids featuring an enriched space for capturing both strong and weak pressure discontinuities. The proposed enriched finite ...

    • An implicit Material Point Method applied to granular flows 

      Iaconeta, Ilaria; Larese De Tetto, Antonia; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (Elsevier, 2017)
      Comunicació de congrés
      Accés obert
      The main objective of this work lies in the development of a variational implicit Material Point Method (MPM), implemented in the open source Kratos Multiphysics framework. The ability of the MPM technique to solve large ...

    • Analysis of fluid soil-structure interaction problems with the particle finite element method (PFEM) 

      Oñate Ibáñez de Navarra, Eugenio; Celigueta Jordana, Miguel Ángel; Idelsohn Barg, Sergio Rodolfo; Salazar González, Fernando; Larese De Tetto, Antonia; Rossi, Riccardo; Suárez Arroyo, Benjamín; Morán, R. (2012)
      Report de recerca
      Accés obert
      We present some developments in the Particle Finite Element Method (PFEM) for analysis of coupled problems in mechanics involving fluid-soil-structure interaction (FSSI). The PFEM uses an updated Lagrangian description to ...

    • Analysis of stability of earth dams in overtopping scenarios with the particle finite element method 

      Larese De Tetto, Antonia; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (CIMNE (Centro Internacional de Métodos Numéricos en Ingeniería), 2009)
      Text en actes de congrés
      Accés obert
      The aim of this work is to study the consequences of an overtopping on the stability of earth dams and its possible failure mode. Rehabilitation and safety analysis of existing dams is nowadays an open field of research. ...

    • Analysis of the discharge capacity of radial gated-spillways using CFD and ANN: Oliana Dam case study 

      Salazar González, Fernando; Morán Moya, Rafael; Rossi, Riccardo; Oñate Ibáñez de Navarra, Eugenio (2013-03)
      Article
      Accés restringit per política de l'editorial
      The paper focuses on the analysis of radial-gated spillways, which is carried out by the solution of a numerical model based on the finite element method (FEM). The Oliana Dam is considered as a case study and the discharge ...