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Ara es mostren els items 1-20 de 41

    • A finite element model for fluid–structure interaction problems involving closed membranes, internal and external fluids 

      Ryzhakov, Pavel; Oñate Ibáñez de Navarra, Eugenio (2017-11)
      Article
      Accés obert
      In this paper we propose a Finite Element model for analyzing closed membranes (“bags”) interacting with internal and external (surrounding) fluids. The approach is based on embedding a Lagrangian monolithic model describing ...

    • A modified fractional step approach 

      Ryzhakov, Pavel; Oñate Ibáñez de Navarra, Eugenio; Rossi, Riccardo (2011)
      Text en actes de congrés
      Accés obert
      We propose here a methodology for improving mass-conservation features of the fractional-step schemes on moving grids applied to viscous incompressible flows containing free surfaces. The idea is to find a better approximation ...

    • A modified fractional step method for fluid–structure interaction problems 

      Ryzhakov, Pavel (2017-01)
      Article
      Accés obert
      We propose a Lagrangian fluid formulation particularly suitable for fluid–structure interaction (FSI) simulation involving free-surface flows and light-weight structures. The technique combines the features of fractional ...

    • A modified fractional step method for fluid–structure interaction problems 

      Ryzhakov, Pavel (Universitat Politècnica de Catalunya. CIMNE, 2017)
      Article
      Accés obert
      We propose a Lagrangian fluid formulation particularly suitable for fluid–structure interaction (FSI) simulation involving free-surface flows and light-weight structures. The technique combines the features of fractional ...

    • A monolithic Lagrangian approach for fluid-structure interaction problems 

      Ryzhakov, Pavel; Rossi, Riccardo; Idelsohn Barg, Sergio Rodolfo; Oñate Ibáñez de Navarra, Eugenio (2010-11)
      Article
      Accés restringit per política de l'editorial
      Current work presents a monolithic method for the solution of fluid–structure interaction problems involving flexible structures and free-surface flows. The technique presented is based upon the utilization of a Lagrangian ...

    • A particle finite element-based model for droplet spreading analysis 

      Mahrous, Elaf; Jarauta, Alex; Chan, Thomas; Ryzhakov, Pavel; Weber, Adam Z.; Roy, R. Valéry; Secanell, Marc (2020-04)
      Article
      Accés obert
      A particle finite element method-based model is proposed to analyze droplet dynamics problems, particularly droplet spreading on solid substrates (wetting). The model uses an updated Lagrangian framework to formulate the ...

    • A pseudo-DNS method for the simulation of incompressible fluid flows with instabilities at different scale 

      Idelsohn Barg, Sergio Rodolfo; Nigro, Norberto; Larreteguy, Axel; Gimenez, Juan Marcelo; Ryzhakov, Pavel (Springer, 2020-01)
      Article
      Accés obert
      In this work, a new model for the analysis of incompressible fluid flows with massive instabilities at different scales is presented. It relies on resolving all the instabilities at all scales without any additional model, ...

    • A semi-analytical model for droplet dynamics on the GDL surface of a PEFC electrode 

      Jarauta Arabí, Àlex; Secanell, Marc; Pons Prats, Jordi; Ryzhakov, Pavel; Idelsohn Barg, Sergio Rodolfo; Oñate Ibáñez de Navarra, Eugenio (2015-04)
      Article
      Accés obert
      Water management is one of the key factors in Proton Exchange Fuel Cell (PEFC) performance. The water produced within the fuel cell is evacuated through the gas channels, but at high current densities water can block the ...

    • A semi-explicit multi-step method for solving incompressible navier-stokes equations 

      Ryzhakov, Pavel; Martí, Julio Marcelo (Multidisciplinary Digital Publishing Institute, 2018-01)
      Article
      Accés obert
      The fractional step method is a technique that results in a computationally-efficient implementation of Navier–Stokes solvers. In the finite element-based models, it is often applied in conjunction with implicit time ...

    • 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 ...

    • A Unified arbitrary lagrangian-eulerian model for fluid-structure interaction problems involving flows in flexible channels 

      Ryzhakov, Pavel; Martí, Julio Marcelo; Dialamishabankareh, Narges (2022)
      Article
      Accés obert
      In this work a finite element-based model for analyzing incompressible flows in flexible channels is presented. The model treats the fluid-solid interaction problem in a monolithic way, where the governing equations for ...

    • Adaptive breakwaters with inflatable elements for coastal protection. Preliminary numerical estimation of their performance 

      Ryzhakov, Pavel; Hermosilla Casajús, Pedro; Ubach Fuentes, Pere-Andreu; Oñate Ibáñez de Navarra, Eugenio (2022-05)
      Article
      Accés obert
      Excessive erosion of sand beaches defines a serious problem worldwide and is particularly pronounced in the Mediterranean region. One of the typical mea- sures for alleviating this erosion consists in building rigid ...

    • 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 axisymmetric PFEM formulation for bottle forming simulation 

      Ryzhakov, Pavel (Springer, 2017-01)
      Article
      Accés obert
      A numerical model for bottle forming simulation is proposed. It is based upon the Particle Finite Element Method (PFEM) and is developed for the simulation of bottles characterized by rotational symmetry. The PFEM strategy ...

    • An embedded approach for immiscible multi-fluid problems 

      Ryzhakov, Pavel; Jarauta Arabí, Àlex (2015-11-30)
      Article
      Accés obert
      An embedded formulation for the simulation of immiscible multi-fluid problems is proposed. The method is particularly designed for handling gas-liquid systems. Gas and liquid are modeled using the Eulerian and the Lagrangian ...

    • 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 enriched finite element/level-set model for two-phase electrohydrodynamic simulations 

      Narváez Muñoz, Christian; Hashemi, Mohammad Reza; Ryzhakov, Pavel; Pons Prats, Jordi (2023-01-04)
      Article
      Accés obert
      In this work, a numerical model for the simulation of two-phase electrohydrodynamic (EHD) problems is proposed. It is characterized by a physically consistent treatment of surface tension as well as a jump in the electric ...