Now showing items 1-20 of 31

    • 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
      Open Access
      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)
      Conference report
      Open Access
      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 (Universitat Politècnica de Catalunya. CIMNE, 2017)
      Article
      Open Access
      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 (2017-01)
      Article
      Open Access
      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
      Restricted access - publisher's policy
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Open Access
      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
      Restricted access - publisher's policy
      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
      Restricted access - publisher's policy
      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 ...
    • 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)
      Part of book or chapter of book
      Restricted access - publisher's policy
      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)
      Conference report
      Open Access
      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
      Open Access
      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
      Open Access
      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 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
      Restricted access - publisher's policy
      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 explicit/implicit Runge–Kutta-based PFEM model for the simulation of thermally coupled incompressible flows 

      Martí, Julio Marcelo; Ryzhakov, Pavel (Springer, 2020-01)
      Article
      Open Access
      A semi-explicit Lagrangian scheme for the simulation of thermally coupled incompressible flow problems is presented. The model relies on combining an explicit multi-step solver for the momentum equation with an implicit ...
    • An explicit–implicit finite element model for the numerical solution of incompressible Navier–Stokes equations on moving grids 

      Martí, Julio Marcelo; Ryzhakov, Pavel (2019-06)
      Article
      Open Access
      In this paper an efficient mesh-moving Finite Element model for the simulation of the incompressible flow problems is proposed. The model is based on a combination of the explicit multi-step scheme (Runge–Kutta) with an ...
    • An implicit surface tension model for the analysis of droplet dynamics 

      Jarauta Arabí, Àlex; Ryzhakov, Pavel; Pons Prats, Jordi; Secanell, Marc (2018-08-10)
      Article
      Open Access
      A Lagrangian incompressible fluid flow model is extended by including an implicit surface tension term in order to analyze droplet dynamics. The Lagrangian framework is adopted to model the fluid and track its boundary, ...
    • Challenges in computational modeling of two-phase transport in polymer electrolyte fuel cells flow channels: a review 

      Ryzhakov, Pavel; Jarauta, Alex (2018-11)
      Article
      Open Access
      Excess of liquid water in gas channels of polymer electrolyte fuel cells is responsible for malfunctioning of these devices. Not only it decreases their efficiency via partial blockage of reactants and pressure drop, but ...