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Rolicer Consortium; What Makes a Material Function? EUROPEAN COMMISSION Directorate-General for Research and Innovation Directorate G— Industrial Technologies Unit G3 Materials E-mail: [email protected] [email protected] Website: http://ec.europa.eu/research/industrial_technologies/pdf/modelling-brochure_en.pdf Contact: Lula Rosso and Anne F. de Baas European Commission B-1049 Brussels What makes a material function? Let me compute the ways… Modelling in FP7 NMP Programme Materials projects Third version Edited by Lula Rosso and Anne F de Baas Directorate-General for Research and Innovation 2012 Industrial technologies (NMP) programme EUR 25531 EN EUROPE DIRECT is a service to help you find answers to your questions about the European Union Freephone number (*): 00 800 6 7 8 9 10 11 (*) Certain mobile telephone operators do not allow access to 00 800 numbers or these calls may be billed LEGAL NOTICE Neither the European Commission nor any person acting on behalf of the Commission is responsible for the use which might be made of the following information. The views expressed in this publication are the sole responsibility of the author and do not necessarily reflect the views of the European Commission. More information on the European Union is available on the Internet (http://europa.eu). Cataloguing data can be found at the end of this publication. Luxembourg: Publications Office of the European Union, 2012 ISBN 978-92-79-26597-6 doi 10.2777/21919 © European Union, 2012 Reproduction is authorised provided the source is acknowledged. CONTENT Introduction Importance of the projects to the European industry Questions that can be answered by modelling What are models? What are simulations? Model application and model development Choosing the right model Numerical power needed and up-scaling for the industry Model types and scales Linking of models (multi-scaling and multi-physics/chemistry modeling) Modelling for interpretation of experimental results/characterisation Chapter 1 Electronic models 1.1 Ab initio quantum mechanical (or first principle) models 1.1.1 Hartree Fock approximation 1.1.2 Higher level ab initio methods 1.1.3 Density Functional Theory 1.2 Many-body models and effective Hamiltonians 1.2.1 Nearly free electron model 1.2.2 Pseudopotentials 1.2.3 Semi-empirical tight binding potential (TB) model 1.2.4 Hubbard model 1.2.5 k⋅p effective Hamiltonian 1.2.6 Polarisable continuum model 1.2.7 Envelope function approximation for continuous media 1.3 Quantum mechanical in response to time dependent fields 1.3.1 TD-DFT and TD(Spin)DFT 1.3.2 Time dependent k⋅p model 1.3.3 Other time-dependent models 1.4 Statistical charge transport model 1.4.1 Semi-classical drift-diffusion model 1.4.5 Percolation models Chapter 2 Atomistic models 2.1 Molecular Mechanics 2.2 Statistical mechanics models: Molecular Dynamics 2.2.1 Classical molecular dynamics 2.2.2. Ab-initio molecular dynamics 2.2.3. Quantum mechanics/molecular mechanics (QM/MM) 2.3 Statistical mechanics models: Monte Carlo molecular models 2.4 Atomistic spin models 2.5 Statistical atomistic models 2.5.1 Langevin Dynamic method for magnetic spin systems 2.5.2 Semi-classical non-equilibrium spin transport model 2.5.3 Statistical transport model at atomistic level 1 Chapter 3 Mesocopic models 3.1 Coarse Grained Molecular Dynamics 3.2 Discrete lattice dynamics model 3.3 Statistical Mechanics mesoscopic models 3.3.1 Lattice gas automata 3.3.2 Dissipative Particle Dynamics (DPD) 3.4 Discrete phase field model (thermodynamics) 3.5 Micromagnetism model Chapter 4 Continuum modelling of materials 4.1 Solid Mechanics 4.2 Fluid Mechanics 4.3 Heat flow and thermo-mechanics 4.4 Continuum Thermodynamics 4.5 Chemistry reaction (kinetic) models (meso and continuum) 4.6 Electromagnetism (including optics, magnetics, electrical) 4.7 Process and device modelling Chapter 5 Linking of models and numeric 5.1 Linking of models 5.1.1 Linking between different electronic models 5.1.2 Linking between electronic and atomistic models 5.1.3 Linking between electronic and mesoscopic models 5.1.4 Linking between electronic and continuum models 5.1.5 Linking between different atomistic models 5.1.6 Linking between atomistic and mesocale models 5.1.7 Linking between atomistic and continuum mechanics 5.1.8 Linking between mesoscopic and continuum mechanics 5.1.9 Linking between different continuum models 5.1.10 Combination of flow models with thermomechanics 5.2 Numerics 5.2.1 Discretisation 5.2.2 Statistical method to solve different equations 5.2.3 Accelerated simulations models 5.2.4 Post processing and extraction of data 5.2.5 Databases Chapter 6 Development of models 6.1 Modelling of fundamental equations 6.2 Modelling of constitutive equations Chapter 7 Applications of models 2 Chapter 8 Impressions of industrial modelling 8.1 Industrial areas 8.2 Type of models used 8.3 Reasons why industry uses modelling 8.4 Industrial use of models for new materials 8.5 Industrial use of models for manufacturing 8.6 Industrial use of models for products and devices design 8.7 Industrial research into modelling Chapter 9 Achievements of the models beyond experiments Chapter 10 Conclusions Annex 1 FP7 NMP Projects fiches Annex 2 List of simulation software used in NMP projects 3 Introduction This is the third and more complete brochure presenting modelling projects funded under FP7. The publication of the first and second brochure has received extensive appreciation and the European Commission has received numerous statements and inputs that have been taken into account to prepare this second brochure. Modelling is a powerful tool that supports materials research in the development of novel or improved applications. It provides the key information for identifying new materials, tailoring materials and design materials for structures and systems. To foster dialogue and mutual understanding between industrial end-users, software developers and theoreticians, this publication presents the scope and achievements of the modeling in about 80 projects funded in the 7th Framework Programme (2007-2013) by the NMP Programme, unit Materials. Importance of the projects to the European Industry The use of materials modeling in industries is very versatile. Application addresses fields like Energy, Environment, Transport, Health, ICT and Manufacturing. It is supporting the creation of products like solar cells, sensors, car parts, tissues, computers, tools, coatings. Industrial application is the target of the FP7 NMP program and the projects show the continuous effort to move from model development to model application and finally upscaling for industrial application. It is important to note that, in general, models become most useful to industry when they have reached an advanced maturity. This requires strong interaction between the code developers and industry, and, because of the complexity and long timescale of the code development and validation process, the support of programmes such as NMP makes an important contribution to competitiveness. The most crucial issue related to modeling in industrial applications is in the formulation of models that produce realistic results. In general, modeling and simulations can be the eyes of the experimentalists, helping them to access information that would not be available otherwise and interpret the experimental results. Modeling provides also invaluable predictions on the evolution of a system in a quicker or cheaper way than with trial and error methods. Industry uses modelling for: Saving costs by establishing a strategy for testing and by screening new material candidates, when a “try and fail” approach cannot be carried out in the industry or it would be too complicated, dangerous or expensive. Understanding results of measurements. This is particularly important at the nanoscale and at femtoscale where access to materials properties and processing methods is often difficult. The simulation can provide this information for every point in the sample at every time. Reducing the time to market, by accelerating the time scales of understanding and developing new materials. Suggesting new materials and experimental procedures to create them. Materials design by modeling is about investigation of relations between chemical and physical composition, microstructure and effective properties at a macroscale, so that a material can be designed with desired macro-properties. Modeling can be used to examine the properties of materials and devices that have not or cannot yet be created. 4 Questions that can be answered by modelling To show the value of modeling, the achievements of the models beyond experiments have been listed. The models can answer questions like: •What is the influence of the automotive catalytic converter’s shape on its performance? •Which hydrogen-microstructure interactions play a critical role in the degradation of materials and components? •Which are the dissipation mechanisms that contribute to the macroscopic adhesion between a metal and a polymer? •What is the role of thermodynamics and what are the reversal processes involved in ultrafast magnetisation processes? • Is it possible to control the parameters of the excitation process and of the metal oxides to create long-lived metastable phases with tailored physical properties? • Which is the role of the size of the systems in realistic nanometric devices? How is the dynamics influenced when the length scale is reduced to the nanometer size of devices (<20 nm)? •Which are the parameters that control the final state in a solar cell reached after the photo-excitation? • Which is the influence of biomedical devices on the surrounding tissues? • What is the most adequate stiffness and permeability of an intervertebral disc substitute? • Which is the increase of electrical conductivity in composites upon addition of carbon nanotubes? What are models? What are simulations? Materials are complex systems and the equations that describe the physical and chemical behaviour of real systems are often too complicated to be solved easily. In order to save computer time, which is a precious and limited resource, the description of phenomena has to be simplified.
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