Simulating the Gluing of Wood Particles by Lattice Gas Cellular Automata and Random Walk

In this work a mathematical model and simulation for the gluing of wood particles designated for particleboards is presented. The aim is to obtain a better understanding of the gluing process. Thus, the behaviour of wood particles during gluing is investigated and the resulting adhesive distribution across the surface of the wood particles is analysed. For developing a mathematical model, the modelling methods “lattice gas cellular automata” and “random walk” were used. The model was implemented in MATLAB and different scenarios were simulated for answering the main questions of the behaviour during gluing. The influences of different parameters on the adhesive distribution were investigated and quantitatively determined by several key figures. Based on these key figures, the effects of the mixing arm, realistic size distributions of wood particles and adhesive droplets, the transfer of adhesive, and the total mass of adhesive are discussed. Furthermore the results are compared with experimental measurements. The simulation results show that the model can feasibly be used for studying the gluing of wood particles. For a possible industrial application, additional research for developing a three-dimensional model is needed.

Lattice Gas-Cellular Automata

This chapter discusses the ancestor of the Lattice Boltzmann, the Boolean formulation of hydrodynamics known as lattice Gas Cellular Automata. In 1986, Uriel Frisch, Brosl Hasslacher and Yves Pomeau sent big waves across the fluid dynamics community: a simple cellular automaton obeying nothing but conservation laws at a microscopic level was able to reproduce the complexity of real fluid flows. This discovery spurred great excitement in the fluid dynamics community. The prospects were tantalizing: around free, intrinsically parallel computational paradigm for fluid flows. However, a few serious problems were quickly recognized and addressed with great intensity in the following years.

Autômatos Celulares e Sistema Multiagente para Simulação da Propagação de Doenças

Nestetrabalhoéapresentadoumestudosobremodeloscomputacionais epidemiológicos enfocando o tipo Suscetível-Infectado-Removido, SIR, e diferentes estratégias de solução à simulação computacional da propagação de doenças transmissíveis. Mostra-se que modelos baseados em autômatos celulares tipo Lattice Gas Cellular Automata, LGCA, têm soluções assemelhadas às obtidas por sistemas multiagentes, diferentemente de autômatos celulares difusivos. Os resultados obtidos da literatura, bem como aqueles decorrentes deste trabalho, apontam que tais metodologias têm potencial à simulação da dinâmica de fenômenos ecológicos, biológicos e físicos que possam assim ser modelados. Indicam, contudo, que resultados mais condizentes com dados reais dependem do desenvolvimento e da parametrização de modelos que adicionem características essenciais ao fenômeno, como a interação entre indivíduos e meio ambiente, e a heterogeneidade do sistema relacional de contatos.