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We introduce two improvements in the numerical scheme to simulate collision and slow shearing of irregular particles. First, we propose an alternative approach based on simple relations to compute the frictional contact forces. The approach improves efficiency and accuracy of the Discrete Element Method (DEM) when modeling the dynamics of the granular packing. We determine the proper upper limit for the integration step in the standard numerical scheme using a wide range of material parameters. To this end, we study the kinetic energy decay in a stress controlled test between two particles. Second, we show that the usual way of defining the contact plane between two polygonal particles is, in general, not unique which leads to discontinuities in the direction of the contact plane while particles move. To solve this drawback, we introduce an accurate definition for the contact plane based on the shape of the overlap area between touching particles, which evolves continuously in time.

Ce contenu fait partie de l' Encyclopédie raisonnée des techniques du cinéma , publiée par le Partenariat international de recherche sur les techniques et technologies du cinéma TECHNÈS. This content is part of the Encyclopedia of Film Techniques and Technologies , published by the International Research Partnership on Cinema Technology, TECHNÈS. Parcours rattaché/ related parcours : Parcours étudiants : regards et perspectives / Student Parcours: Potpourri Source: Autodesk Maya 2016 Help Identifiant/ identifier : ark:/17444/22919r

Ce contenu fait partie de l' Encyclopédie raisonnée des techniques du cinéma , publiée par le Partenariat international de recherche sur les techniques et technologies du cinéma TECHNÈS. This content is part of the Encyclopedia of Film Techniques and Technologies , published by the International Research Partnership on Cinema Technology, TECHNÈS. Parcours rattaché/ related parcours : Parcours étudiants : regards et perspectives / Student Parcours: Potpourri Source: Autodesk Maya 2016 Help Identifiant/ identifier : ark:/17444/22919r

Surface formulation of method of moments gives the best results in electromagnetic analysis when geometrical modeling is performed with quadrilateral patches. Quadrilateral modeling, however, can be very difficult. Many structures, e.g. different microwave devices, can be easily modeled using polygonal surfaces. This paper presents general method for conversion of polygonal model into quadrilateral model. Proposed method is illustrated on real microwave filter.