Abstract

The paper discussed numerical approach for an estimation of initial elastic material properties for homogenised models of masonry. The tensor scale parameter is utilised. The paper discusses the principles of the use of the tensor scale for such task and it also discusses current limitations of the procedure. A numerical example is provided to illustrate the practical use of the proposed method.

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A numerical study of unidimensional and steady state bimodal flux diffusion equation has been developed using the Finite Volume Method. In addition, with the Ficks flux, this equation has another flux named retention or secondary flux. The influence of each flux has been analysed in this work. The influence of several different parameters, such as boundary conditions or amplitude and frequency of the solution, in the numerical errors has been studied. Numerical results show the performance of the proposed model.

Abstract

The  main objective of the research presented in this work is the formulation, analysis and implementation of efficient numerical algorithms for dissipate dynamical systems in solids mechanics. The dissipate structure exhibited by the systems considered is described in detail for the coupled thermoviscoplastic problem including phase change phenomena and extended to the frictional thermomechanical contact problem.

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Presents a numerical strategy for the aerodynamic analysis of large buildings, with an application to the simulation of the air flow within a telescope building. The finite element formulation is presented first, and then the methodology followed to obtain significant data from the calculations is described. The quality of the ventilation of the building is defined by the average residence times, and the feasibility of this ventilation by the actions created on the instruments and the general flow pattern.

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A finite element model has been developed for the 3D simulation of the sintering of a single track during a selective laser sintering process (SLS). The model takes into account both the thermal and the sintering phenomena involved in the process. Owing to the continuous movement of the laser beam the model takes also into account the transient nature of the problem. This is transformed into a pseudo‐static one through a transformation of the coordinates system of the equations. Nevertheless, this transformation introduces a convective term into the heat equations that produces instabilities in the solution. These instabilities have been solved by using a stream upwind Petrov Galerkin (SUPG) strategy together with a shock capturing scheme. Finally, a fixed point strategy is used for the solution of the analysis. The model has been tested through the solution of some examples.

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