Now showing items 21-40 of 51

    • 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
      Open Access
      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 ...
    • Fluid-structure interaction based on HPC multicode coupling 

      Cajas García, Juan Carlos; Houzeaux, Guillaume; Vázquez, Mariano; Garcia Gasulla, Marta; Casoni Rero, Eva; Calmet, Hadrien; Artigues, Antoni; Borrell Pol, Ricard; Lehmkuhl Barba, Oriol; Pastrana Maldonado, Daniel; Yáñez, David; Pons, Ramon; Martorell Lopez, Jordi (2018)
      Article
      Restricted access - publisher's policy
      The fluid-structure interaction (FSI) problem has received great attention in the last few years, mainly because it is present in many physical systems, industrial applications, and almost every biological system. In the ...
    • Fluid–structure interaction simulations outperform computational fluid dynamics in the description of thoracic aorta haemodynamics and in the differentiation of progressive dilation in Marfan syndrome patients 

      Pons, Ramón; Cajas, Juan Carlos; Rodríguez-Palomares, José F.; Guala, Andrea; Dux-Santoy, Lydia; Teixidó-Tura, Gisela; Molins, José Javier; Vázquez, Mariano; Evangelista, Arturo; Martorell, Jordi (The Royal Society, 2020-02)
      Article
      Open Access
      Abnormal fluid dynamics at the ascending aorta may be at the origin of aortic aneurysms. This study was aimed at comparing the performance of computational fluid dynamics (CFD) and fluid–structure interaction (FSI) simulations ...
    • 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 = ...
    • Heterogeneous CPU/GPU co-execution of CFD simulations on the POWER9 architecture: Application to airplane aerodynamics 

      Borrell, Ricard; Dosimont, Damien; Garcia Gasulla, Marta; Houzeaux, Guillaume; Lehmkuhl Barba, Oriol; Mehta, Vishal; Owen, Herbert; Vázquez, Mariano; Oyarzun Altamirano, Guillermo (Elsevier, 2020-06)
      Article
      Restricted access - publisher's policy
      High fidelity Computational Fluid Dynamics simulations are generally associated with large computing requirements, which are progressively acute with each new generation of supercomputers. However, significant research ...
    • 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 ...
    • HPC compact quasi-Newton algorithm for interface problems 

      Santiago, Alfonso; Zavala Aké, Miguel; Borrell Pol, Ricard; Houzeaux, Guillaume; Vázquez, Mariano (Elsevier, 2020)
      Article
      Restricted access - publisher's policy
      In this work we present a robust interface coupling algorithm called Compact Interface quasi-Newton (CIQN). It is designed for computationally intensive applications using an MPI multi-code partitioned scheme. The algorithm ...
    • 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 ...
    • Modelización computacional cardiaca 

      Bragard, Jean; Camara Rey, Oscar; Echebarría Domínguez, Blas; Pueyo, Esther; Soudah Prieto, Eduardo; Vázquez, Mariano (Elsevier, 2020-08-01)
      Article
      Restricted access - publisher's policy
      Las enfermedades cardiovasculares tienen en la actualidad un gran impacto social y económico y constituyen una de las principales causas de mortalidad y morbilidad. Los modelos computacionales personalizados del corazón ...
    • MPI+X: task-based parallelisation and dynamic load balance of finite element assembly 

      Garcia, Marta; Houzeaux, Guillaume; Ferrer, Roger; Artigues, Antoni; López, Victor; Labarta Mancho, Jesús José; Vázquez, Mariano (Taylor & Francis, 2019-05)
      Article
      Open Access
      The main computing phases of numerical methods for solving partial differential equations are the algebraic system assembly and the iterative solver. This work focuses on the first task, in the context of a hybrid MPI+X ...
    • 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 Mancho, Jesús José; 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 ...
    • Numerical characterization of a technically premixed hydrogen flame under conditions close to flashback 

      Mira Martínez, Daniel; Lehmkuhl, Oriol; Both, Ambrus; Stathopoulos, Panagiotis; Tanneberger, Tom; Reichel, Thoralf G.; Paschereit, Christian Oliver; Vázquez, Mariano; Houzeaux, Guillaume (Springer, 2020-03)
      Article
      Open Access
      This work presents a numerical study of a technically premixed swirling combustor with central air injection at conditions close to flashback using large-eddy simulation with flamelet modelling. This burner has the ...
    • 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 ...