Now showing items 1-20 of 27

  • A 3D low-order panel method for unsteady aerodynamic problems 

    Ortega, Enrique; Flores Le Roux, Roberto Maurice; Oñate Ibáñez de Navarra, Eugenio (2010)
    External research report
    Open Access
    An unsteady low-order panel method for three-dimensional subsonic analyses is presented. The method, which is based on well-established techniques in computational aerodynamics, is intended to achieve a cost-effective ...
  • Aeroelastic analysis of parachute deceleration systems with empirical aerodynamics 

    Ortega, Enrique; Flores Le Roux, Roberto Maurice (2019-11-13)
    Article
    Open Access
    A technique for the aeroelastic solution of parachute decelerators is presented in this work. The methodology uses empirical aerodynamics, based on a filling-time inflation model and Ludtke's area law, coupled to two ...
  • A meshless finite point method for the three-dimensional analysis of compressible flow problems involving moving boundaries and adaptivity 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (2013-10)
    Article
    Restricted access - publisher's policy
    A finite point method for solving compressible flow problems involving moving boundaries and adaptivity is presented. The numerical methodology is based on an upwind-biased discretization of the Euler equations, written ...
  • A meshless finite point method for three dimensional analysis of compressible flow problems involving moving boundaries and adaptivity 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (2013-10)
    Article
    Restricted access - publisher's policy
    A finite point method for solving compressible flow problems involving moving boundaries and adaptivity is presented. The numerical methodology is based on an upwind-biased discretization of the Euler equations, written ...
  • A meshless finite point method for three-dimensional analysis of compressible flow problems involving moving boundaries and adaptivity 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (2013-10)
    Article
    Open Access
    A finite point method for solving compressible flow problems involving moving boundaries and adaptivity is presented. The numerical methodology is based on an upwind-biased discretization of the Euler equations, written ...
  • Analysis of perturbations and station-keeping requirements in highly-inclined geosynchronous orbits 

    Fantino, Elena; Flores Le Roux, Roberto Maurice; Di Salvo, Alessio; Di Carlo, Marilena (2015)
    Conference report
    Open Access
    There is a demand for communications services at high latitudes that is not well served by conventional geostationary satellites. Alternatives using low-altitude orbits require too large constellations. Other options are ...
  • An edge-based solver for compressible flow 

    Ortega, Enrique; Flores Le Roux, Roberto Maurice; Oñate Ibáñez de Navarra, Eugenio (2005-10)
    External research report
    Open Access
    An edge-based high-resolution scheme for the solution of the compressible Euler equations on unstructured finite elements grids is presented. The flow solver adopted in the present work is the approximate Riemann solver ...
  • An implicit unsteady hydraulic solver for suspended cuttings transport in managed pressure wells 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique; Ilin, A.; Simpkins, Douglas; Oñate Ibáñez de Navarra, Eugenio (Springer, 2019-04)
    Article
    Open Access
    We present a simulation tool for transient events in complex hydraulic networks. The code includes modelling of the transport of suspended cuttings in near-vertical wells. An unstructured finite volume formulation with ...
  • A numerical investigation of wind tunnel model deformations caused by the twin-sting support system 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio (2009)
    External research report
    Open Access
    This work presents a wing deformation analysis of a twin-sting-mounted commercial aircraft model. Twin-sting arrangements minimize flow disturbances around the model fuselage and tail; on the other hand, they cause important ...
  • A numerical investigation of wind tunnel model deformations caused by the twin-sting support system 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio (2010-03)
    Article
    Restricted access - publisher's policy
    The present work is part of a broader investigation aimed at improving the understanding of the aerodynamics of the rear aircraft section. Complex flow phenomena (e.g., the thick fuselage boundary layer at the rear end) ...
  • A-posteriori error estimation for the finite point method with applications to compressible flow 

    Ortega, Enrique; Flores Le Roux, Roberto Maurice; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo (2017-04)
    Article
    Open Access
    An a-posteriori error estimate with application to inviscid compressible flow problems is presented. The estimate is a surrogate measure of the discretization error, obtained from an approximation to the truncation terms ...
  • Application of the finite point method to high- Reynolds number compressible flow problems 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (2014-04)
    Article
    Restricted access - publisher's policy
    In this work, the finite point method is applied to the solution of high-Reynolds compressible viscous flows. The aim is to explore this important field of applications focusing on two main aspects: the easiness and ...
  • A simulation tool for parachute/payload systems 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique; Vallés Fluvià, J.; Oñate Ibáñez de Navarra, Eugenio (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
    Conference report
    Restricted access - publisher's policy
    The design and evaluation of parachute-payload systems is a technology field in which numerical analysis tools can make very important contributions. This work describes a new development from CIMNE in this area, a coupled ...
  • Comparative accuracy and performance assessment of the finite point method in compressible flow problems 

    Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio; Idelsohn Barg, Sergio Rodolfo; Flores Le Roux, Roberto Maurice (Elsevier, 2014-01-20)
    Article
    Restricted access - publisher's policy
    A comparative assessment of the Finite Point Method (FPM) is presented. Using a wing-fuselage configuration under transonic inviscid flow conditions as reference test case, the performance of the FPM flow solver is compared ...
  • Efficient aeroelastic analysis of inflatable structures using enhanced potential flow aerodynamics 

    Ortega, Enrique; Flores Le Roux, Roberto Maurice; Cuartero Zaragoza, Eric; Oñate Ibáñez de Navarra, Eugenio (2019-10)
    Article
    Restricted access - publisher's policy
    An efficient method for the aeroelastic analysis of wind effects on inflatable structures is presented. The solution scheme is staggered and uses an explicit finite-element structural solver and potential flow aerodynamics. ...
  • Efficient aeroelastic analysis of wind loads on inflatable hangars 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique (International Centre for Numerical Methods in Engineering (CIMNE), 2019)
    Conference report
    Open Access
    Wind loads play a crucial role in inflatable structures. Unfortunately, design loads from safety regulations grossly overestimate the real aerodynamic forces. Thus, a more accurate estimation of wind loads is desirable. ...
  • Efficient Two-Body Approximations of Impulsive Transfers between Halo Orbits 

    Fantino, Elena; Flores Le Roux, Roberto Maurice; Al-Khateeb, Ashraf (International Astronautical Federation, 2018)
    Conference report
    Restricted access - publisher's policy
    This contribution presents an efficient method to compute direct transfers between Halo orbits from two circular restricted three-body problems. Owing to the remarkable impulse given over the past two decades to the plans ...
  • Ensayos de flameo: procedimientos y herramientas de análisis modal 

    Barros Rodríguez, José; Flores Le Roux, Roberto Maurice (Fundación Rogelio Segovia para el Desarrollo de las Telecomunicaciones (Fundetel), 2013)
    Conference lecture
    Restricted access - publisher's policy
    El flameo es un fenómeno vibratorio que puede llevar a la destrucción de una aeronave en vuelo. Los ensayos en vuelo de flameo, dentro del proceso de integración de Armamento en Plataformas Aéreas, tienen por objeto ...
  • Explicit dynamic analysis of thin membrane structures 

    Flores Le Roux, Roberto Maurice; Ortega, Enrique; Oñate Ibáñez de Navarra, Eugenio (2011-02)
    External research report
    Open Access
    An explicit dynamic structural solver developed at CIMNE for the analysis of parachutes is presented. The canopy fabric has a negligible out-of-plane stiffness, therefore its numerical study presents important challenges. ...
  • Frequency and damping identification in flutter flight testing using singular value decomposition and QR factorization 

    Barros, Jose; Flores Le Roux, Roberto Maurice; Lopez-Díez, Jesus; Martinez-Val, Rodrigo (2015-02)
    Article
    Open Access
    A new method, based on singular value decomposition and QR factorization, has been developed and applied to the analysis of F-18 flutter flight test data. The method is capable of identifying the frequency and damping of ...