Now showing items 21-40 of 44

  • Extension of the parallel Sparse Matrix Vector Product (SpMV) for the implicit coupling of PDEs on non-matching meshes 

    Houzeaux, Guillaume; Borrell, Ricard; Cajas García, Juan Carlos; Vázquez, Mariano (Elsevier, 2018-09-15)
    Article
    Restricted access - publisher's policy
    The Sparse Matrix Vector Product (SpMV) is one of the main operations of iterative solvers, and, in a parallel context, it is also the siege of point-to-point communications between the neighboring MPI processes. The ...
  • From imaging to simulation: a framework applied to simulate the blood flow in the carotids 

    Aris, Ruth; Mani, Venkatesh; Dyvorne, Hadrien A.; Jowkar, M.; Santiago, A.; Houzeaux, G.; Fayad, Zahi; Vázquez, Mariano (Barcelona Supercomputing Center, 2015-05-05)
    Conference report
    Open Access
    In this work we present a methodology to extract information from medical imaging and use it for hemodynamical simulation in arteries. Based on in-vivo magnetic resonance images (MRI), the velocity of the blood flow has ...
  • Fully-Coupled Electromechanical Simulations of the LV Dog Anatomy Using HPC: Model Testing and Verification 

    Aguado-Sierra, Jazmin; Santiago, Alfonso; Rivero, Matías I.; Lopez-Yunta, Mariña; Soto-Iglesias, David; Dux-Santoy, Lydia; Camara, Oscar; Vázquez, Mariano (Springer, 2015-01-01)
    Part of book or chapter of book
    Open Access
    Verification of electro-mechanic models of the heart require a good amount of reliable, high resolution, thorough in-vivo measurements. The detail of the mathematical models used to create simulations of the heart beat ...
  • Generation of a simulation scenario from medical data: Carto and MRI 

    López-Yunta, Marina; Roca, Xevi; Aguado-Sierra, Jazmin; Vázquez, Mariano (Barcelona Supercomputing Center, 2015-05-05)
    Conference report
    Open Access
    Multiphysic cardiac models give accurate simulations of normal and pathologic behavior of the heart. It can help to develop new treatments and medical devices. The complexity relies on both mathematical and geometrical ...
  • Heat loss prediction of a confined premixed jet flame using a conjugate heat transfer approach 

    Gövert, S.; Mira, Daniel; Zavala-Ake, M.; Kok, J.B.W.; Vázquez, Mariano; Houzeaux, Guillaume (Elsevier, 2017-04)
    Article
    Open Access
    The presented work addresses the investigation of the heat loss of a confined turbulent jet flame in a lab-scale combustor using a conjugate-heat transfer approach and large-eddy simulation. The analysis includes the ...
  • Heat Transfer Effects on a Fully Premixed Methane Impinging Flame 

    Mira, Daniel; Zavala, Miguel; Avila, Matías; Owen, Herbert; Cajas García, Juan Carlos; Vázquez, Mariano; Houzeaux, Guillaume (Springer, 2016-01-09)
    Article
    Open Access
    A numerical assessment of different thermal conditions for an impinging flame configuration is investigated using large-eddy simulation. The cases of study correspond to a turbulent methane flame at equivalence ratio ER = ...
  • High-Performance Computing: Do’s and Dont’s 

    Houzeaux, Guillaume; Borrell, Ricard; Fournier, Yvan; Garcia-Gasulla, Marta; Göbbert, Jens H.; Hachem, Elie; Mehta, Vishal; Mesri, Youssef; Owen, Herbert; Vázquez, Mariano (InTech, 2018-02-14)
    Part of book or chapter of book
    Open Access
    Computational fluid dynamics (CFD) is the main field of computational mechanics that has historically benefited from advances in high-performance computing. High-performance computing involves several techniques to make a ...
  • Large-scale CFD simulations of the transitional and turbulent regime for the large human airways during rapid inhalation 

    Calmet, Hadrien; Gambaruto, Alberto M.; Bates, Alister J.; Vázquez, Mariano; Houzeaux, Guillaume; Doorly, Denis J. (Elsevier, 2016-02-01)
    Article
    Open Access
    The dynamics of unsteady flow in the human large airways during a rapid inhalation were investigated using highly detailed large-scale computational fluid dynamics on a subject-specific geometry. The simulations were ...
  • Left Ventricular Trabeculations Decrease the Wall Shear Stress and Increase the Intra-Ventricular Pressure Drop in CFD Simulations 

    Sacco, Federica; Paun, Bruno; Lehmkuhl, Oriol; Iles, Tinen L.; Iaizzo, Paul A.; Houzeaux, Guillaume; Vázquez, Mariano; Butakoff, Constantine; Aguado-Sierra, Jazmin (Frontiers Media, 2018-04-30)
    Article
    Open Access
    The aim of the present study is to characterize the hemodynamics of left ventricular (LV) geometries to examine the impact of trabeculae and papillary muscles (PMs) on blood flow using high performance computing (HPC). ...
  • Local preconditioning and variational multiscale stabilization for Euler compressible steady flow 

    Moragues, Margarida; Vázquez, Mariano; Houzeaux, Guillaume (Elsevier, 2016)
    Article
    Open Access
    This paper introduces a preconditioned variational multiscale stabilization (P-VMS) method for compressible flows. In this introductory paper we focus on inviscid flow and steady state problems. The Euler equations are ...
  • MPI+X: task-based parallelization and dynamic load balance of finite element assembly 

    Garcia-Gasulla, Marta; Houzeaux, Guillaume; Ferrer, Roger; Artigues, Antoni; López, Victor; Labarta, Jesús; Vázquez, Mariano (Taylor & Francis, 2018)
    Article
    Open Access
    The main computing tasks of a finite element code(FE) for solving partial differential equations (PDE's) are the algebraic system assembly and the iterative solver. This work focuses on the first task, in the context of ...
  • On the role of a centrifugal instability in the vortex-induced vibration of a two-degrees of freedom circular cylinder at moderate Reynolds numbers 

    Pastrana, Daniel; Cajas García, Juan Carlos; Lehmkuhl, Oriol; Rodríguez Pérez, Ivette María; Vázquez, Mariano; Houzeaux, Guillaume (2018)
    Conference report
    Restricted access - publisher's policy
    In this work, the formation and role of a centrifugal instability in the VIV phenomenon at moderate Reynolds numbers are investigated for the ¿rst time. Large eddy simulations of a low mass ratio (m = 2.6) two-degree-of-freedom ...
  • Parallel embedded boundary methods for fluid and rigid-body interaction 

    Samaniego, Cristóbal; Houzeaux, Guillaume; Samaniego, Esteban; Vázquez, Mariano (Elsevier, 2015-06-15)
    Article
    Open Access
    The implementations of an updated body-fitted and a non body-fitted method to deal with the interaction of a fluid and a rigid body are described. The physics of the fluid is modeled by the incompressible Navier-Stokes ...
  • Parallel Implementation of Domain Composition Methods 

    Houzeaux, Guillaume; Cajas García, Juan Carlos; Eguzkitza, Beatriz; Vázquez, Mariano (Saxe-Coburg Publications, 2015-04)
    Part of book or chapter of book
    Open Access
    Domain composition methods (DCM) consist of obtaining a solution to a problem on a domain, from the formulations of the same problem expressed on various subdomains. These methods have therefore the oppostive objective to ...
  • Parallel mesh partitioning based on space filling curves 

    Borrell, Ricard; Cajas García, Juan Carlos; Mira, Daniel; Taha, A.; Koric, S.; Vázquez, Mariano; Houzeaux, Guillaume (Elsevier, 2018-09)
    Article
    Restricted access - publisher's policy
    Larger supercomputers allow the simulation of more complex phenomena with increased accuracy. Eventually this requires finer and thus also larger geometric discretizations. In this context, and extrapolating to the Exascale ...
  • ParaView + Alya + D8tree: Integrating high performance computing and high performance data analytics 

    Artigues, Antoni; Cugnasco, Cesare; Becerra Fontal, Yolanda; Cucchietti, Fernando; Houzeaux, Guillaume; Vázquez, Mariano; Torres Viñals, Jordi; Ayguadé Parra, Eduard; Labarta Mancho, Jesús José (Elsevier, 2017)
    Article
    Open Access
    Large scale time-dependent particle simulations can generate massive amounts of data, making it so that storing the results is often the slowest phase and the primary time bottleneck of the simulation. Furthermore, analysing ...
  • Recent ship hydrodynamics developments in the parallel two-fluid flow solver Alya 

    Owen, Herbert; Houzeaux, Guillaume; Samaniego, Cristobal; Lesage, Anne C.; Vázquez, Mariano (Elsevier, 2013-07-10)
    Article
    Open Access
    CFD modeling of turbulent free surface flows has become an important tool in the design of ship hulls. A two-fluid flow solver that can predict the flow pattern, free surface shape and the forces on the ship hull is ...
  • Scientific Big Data Visualization: a Coupled Tools Approach 

    Artigues, Antoni; Cucchietti, Fernando M.; Tripiana, Carlos; Vicente, David; Calmet, Hadrien; Marín, Guillermo; Houzeaux, Guillaume; Vázquez, Mariano (South Ural State University (Chelyabinsk, Russia), 2015-02)
    Article
    Open Access
    We designed and implemented a parallel visualisation system for the analysis of large scale time-dependent particle type data. The particular challenge we address is how to analyse a high performance computation style ...
  • Simulations of moist convection by a variational multiscale stabilized finite element method 

    Marras, Simone; Moragues, Margarida; Vázquez, Mariano; Jorba Casellas, Oriol; Houzeaux, Guillaume (2013-11-01)
    Article
    Restricted access - publisher's policy
    A variational multiscale stabilized finite element scheme is presented for the solution of moist atmospheric flows. The fully compressible Euler equations are coupled to a system of three advection equations that model the ...
  • Study of the Wall Thermal Condition Effect in a Lean-Premixed Downscaled Can Combustor Using Large-Eddy Simulation 

    Mira, Daniel; Vázquez, Mariano; Houzeaux, Guillaume; Gövert, Simon; Kok, Jim W.B.; Mahiques, E.I.; Panek, Lukasz (American Society of Mechanical Engineers, 2016-06-13)
    Conference lecture
    Open Access
    The primary purpose of this study is to evaluate the ability of LES, with a turbulent combustion model based on steady flamelets, to predict the flame stabilization mechanisms in an industrial can combustor at full load ...