Browsing by Author "O'Sullivan, Catherine"

Now showing items 1-10 of 10

    • Breakage and critical state via DEM 

      Ciantia, Matteo Oryem; O'Sullivan, Catherine; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio (International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE), 2019)
      Conference report
      Open Access
      Discrete-element simulations are used to explore the relation between breakage-induced grading evolution and the critical state line position on the compression plane. An efficient model of particle breakage is applied to ...

    • Experimental and numerical study of heat generation by energy dissipation in a rotating drum filled with particulate material 

      Nazareth López, Rafael; Kisuka, Francisco; Wu, Chuan Yu; O'Sullivan, Catherine; Franci, Alessandro; Oñate Ibáñez de Navarra, Eugenio (2022)
      Conference lecture
      Restricted access - publisher's policy
      This work aims to investigate the generation of heat by dissipation of mechanical energy in particulate flows. The behavior of material in a rotating drum is considered in experimental and numerical analyses. In the physical ...

    • Fluid effects in sand production simulations coupling DEM with CFD 

      Climent Pera, Natalia; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; O'Sullivan, Catherine (CRC Press Taylor & Francis Group, 2014)
      Conference report
      Restricted access - publisher's policy
      Sand production around a wellbore is here simulated using a three dimensional numerical model based on Discrete Element Method (DEM) coupled with Computational Fluid Dynamics (CFD). The model is calibrated against a ...

    • Grading evolution and critical state in a discrete numerical model of Fontainebleau sand 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; O'Sullivan, Catherine; Gens Solé, Antonio; Liu, T. (Thomas Telford, 2019-01)
      Article
      Open Access
      Granular materials reach critical states upon shearing. The position and shape of a critical state line (CSL) in the compression plane are important for constitutive models, interpretation of in situ tests and liquefaction ...

    • Micromechanical inspection of incremental behaviour of crushable soils 

      Ciantia, Matteo Oryem; Arroyo Alvarez de Toledo, Marcos; O'Sullivan, Catherine; Gens Solé, Antonio (Springer, 2019-10)
      Article
      Open Access
      In granular soils grain crushing reduces dilatancy and stress obliquity enhances crushability. These are well-supported specimen-scale experimental observations. In principle, those observations should reflect some peculiar ...

    • Multi-scale analysis of cone penetration test (CPT) in a virtual calibration chamber 

      Butlanska, Joanna; Arroyo Alvarez de Toledo, Marcos; Gens Solé, Antonio; O'Sullivan, Catherine (2014-01)
      Article
      Restricted access - publisher's policy
      A virtual calibration chamber was developed using a three-dimensional (3D) discrete element method (DEM) to perform cone penetration tests (CPTs) on a discrete analogue of Ticino sand. The macroscale response of the DEM ...

    • Sensitivity to damping in sand production DEM-CFD coupled simulations 

      Climent Pera, Natalia; Arroyo Alvarez de Toledo, Marcos; O'Sullivan, Catherine; Gens Solé, Antonio (American Institute of Physics Conference Proceeding, 2013)
      Conference report
      Restricted access - publisher's policy
      A three dimensional numerical model based on Discrete Element Method (DEM) and coupled with Computational Fluid Dynamics (CFD) was implemented to simulate sand production. Simulations with no fluid flow conditions and with ...

    • Simulation of the cone penetration test: discrete and continuum approaches 

      Gens Solé, Antonio; Arroyo Alvarez de Toledo, Marcos; Butlanska, Joanna; Monforte Vila, Lluís; Carbonell, J.M.; Ciantia, Matteo Oryem; O'Sullivan, Catherine (Australian Geomechanics Society, 2016)
      Conference report
      Restricted access - publisher's policy
      The paper presents the modelling of the cone penetration test using two procedures: a discrete approach and a continuum approach. The discrete approach is based on the Discrete Element Method where a granular material is ...

    • Stress distribution in trimodal samples 

      Liu, Deyun; O'Sullivan, Catherine; Carraro, Antonio (CIMNE, 2019)
      Conference report
      Open Access
      The distribution of stress between coarser and finer particles in gap-graded soils is considered a key factor contributing to the risk of internal instability or suffusion, amongst other soil properties. In reality soils ...

    • Using Delaunay triangulations to investigate the effect of interparticle friction on critical-state DEM simulations 

      Hanley, Kevin J.; Huang, Xin; O'Sullivan, Catherine (CIMNE, 2015)
      Conference report
      Open Access
      It is now broadly accepted that failure in a granular material is dominated by buckling failure of strong force chains oriented in the direction of the major principal stress. In this paper, Delaunay triangulation is used ...