Rimantas Kacianauskas

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The paper describes the development and performance of parallel algorithms for the discrete element method (DEM) software. Spatial domain decomposition strategy and message passing inter-processor communication have been implemented in the DEMMAT code for simulation of visco-elastic frictional granular media. The novel algorithm combining link-cells for(More)
In the present study, CPT is modelled by static elasto-plastic small strain finite element method (FEM) analysis of axi-symmetric problem. Undrained soil properties and Tresca yield criterion is used for determining cone resistance of clay. Sand is modelled by using drained soil properties and Mohr-Coulomb yield criterion. Cone penetration problem is(More)
Numerical simulation of the compacting of particles for the biaxial compression test using the discrete element method is presented. Compacting is considered as the first independent step required for a proper simulation of the entire compression process. In terms of the continuum approach, compacting is regarded as generation of the initial conditions.(More)
The discrete concept and numerical discrete element method (DEM) are applied for simulation of filling and discharge of granular material in a wedge-shape hopper with fixed outlet orifice making the base for optimization of discharge flow parameters. The presented DEM model was validated by examination of the wall pressure and by comparing it with the(More)
Computational tools implementing the semi-analytical finite elements for the linear and stability analysis of thin-walled beams are considered. The proposed method presents two-stage discretisation, where the thin-walled cross section is approximated by the semi-analytical finite elements at the first stage, while conventional longitudinal finite element(More)
The paper considers moving locally predefined (MLP) finite element remeshing technique for deep penetration of the rigid cone into homogeneous and porous medium. Remeshing presents a computational tool implemented in the form of postprocessor type software compatible with standard FEM codes. It involves a transfer operation combining both the moving least(More)