A discrete numerical model for granular assemblies
Author: CUNDALL, P. A. & STRACK, 0. D. L. | Size: 1.328 MB | Format:PDF | Publisher: Géotechnique | Year: 1979 | pages: 19
The distinct element method is a numerical model capable of describing the mechanical behaviour of assemblies of discs and spheres. The method is based on the use of an explicit numerical scheme in which the interaction of the particles is monitored contact by contact and the motion of the particles modelled particle by particle. The main features of the distinct element method are described. The method is validated by comparing force vector plots obtained from the computer program BALL with the corresponding plots obtained from a photoelastic analysis. The photoelastic analysis used for the comparison is the one applied to an assembly of discs by De Josselin de Jong and Verruijt (1969). The force vector diagrams
obtained numerically closely resemble those obtained photoelastically. It is concluded from this comparison that the distinct element method and the program BALL are valid tools for research into the behaviour of granular assemblies.
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This second edition has been expanded to include new and revised sections and provides practical, easy to follow methodologies for a range of calculations used in the design and sizing of heating, ventilating and air conditioning.
The guidance is primarily based on data and procedures contained within the CIBSE Guides, together with other sources such as Building Regulations, with cross-referencing to data sources.
Presented in the form of calculation sheets including design watchpoints, design tips and rules of thumb, the Guide is intended to aid the design process and reduce errors. Calculation sheets are presented in five sections: heating loads, cooling loads, water flow distribution, air flow distribution, and acoustics. Each section is introduced via flowcharts providing an overview of the system design process.
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This Part of EN 508 specifies requirements for self-supporting roofing products for discontinuous laying made from metallic coated steel sheet with or without additional organic coatings. The standard establishes general characteristics, definitions, classifications and labelling for the products, together with requirements for the materials from which the products can be manufactured. It is intended to be used either by manufacturers to ensure that their products comply with the requirements or by purchasers to verify that the products comply when purchased before they are despatched from the factory. It specifies the requirements for products which enable them to meet all normal service conditions. The standard applies to all discontinuously laid self-supporting external profiled sheets for roofing with the exception of tiles with a surface area less than 1 m2 and produced by stamping. These profiled roof sheets are designed to keep wind, rain and snow out of the building and to transfer any resultant loads and infrequent maintenance loads to the structure. No requirements for supporting construction, design of roof system and execution of connections and flashings are included.
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This comprehensive text presents the fundamentals of Computer Fluid Dynamics simply and clearly. The use of Computational Fluid Dynamics to simulate and predict fluid flows, heat transfer and associated phenomena continues to grow throughout many engineering disciplines. On the back of ever more powerful computers and graphical user interfaces CFD provides engineers with a reliable tool to assist in the design of industrial equipment often reducing or eliminating the need for performing trial-and-error experimentation.
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A practical, single-source guide tosuccessful strategies for landscape architecture research
As the scope of landscape architecture expands to engage with other disciplines, and streams of information directing this field continue to grow and diversify, it becomes increasingly important for landscape architects to be able to implement a range of effective research strategies when seeking, creating, and validating knowledge. Landscape Architecture Research offers a framework for advancing better design thinking solutions by supplying readers with a system of inquiry tactics that open up a wider range of research possibilities. With a logical and innovative approach that favors legitimacy of knowledge based on collective, grounded practices, rather than strict adherence to protocols drawn only from scientific models, this comprehensive, illustrated guide produces a sound argument for establishing a new paradigm for legitimizing research quality. Landscape Architecture Research presents:
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