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Martin Garcia Pol - One of the best experts on this subject based on the ideXlab platform.

  • Aplicació del Material Point Method (MPM) a la deformació d'objectes
    Universitat Politècnica de Catalunya, 2020
    Co-Authors: Martin Garcia Pol
    Abstract:

    Una de les branques més importants dins de l'animació per computador és la simulació física del comportament dels objectes d'una escena. Generalment es busca obtenir resultats que visualment es comportin com els objectes reals, i per això és important utilitzar els models matemàtics que defineixen el seu comportament. El fet que la validació en molts casos sigui visual, permet poder dur a terme simplificacions en els models matemàtics per guanyar velocitat de càlcul o disminuir la complexitat del que seria una simulació d'enginyeria. Això si, ajustant sempre les possibles simplificacions a un comportament final visualment realista. Els objectes amb més dificultat a l'hora de la simulació són els objectes deformables, el comportament dels quals ve definit per la mecànica dels medis continus. En aquesta categoria podem trobar des de fluids fins a diferents tipus de materials elàstics. Així podrem simular des d'aigua fins a una pilota de goma, passant per sorra o objectes quasi rígids que es deformen de manera permanent (deformació plàstica). El canvi dels materials vindrà definit pels paràmetres que farem servir en les simulacions, com ara densitat, viscositat, elasticitat, etc. Per tant ens interessa fer servir un model de simulació que permeti canviar i experimentar amb tots aquests valors. En aquest treball s'aprofundeix en el mètode MPM (material point method) que és un mètode híbrid basat en partícules i malles, prou versàtil i eficient per a realitzar una àmplia gamma de simulacions amb diversos materials. Amb aquest mètode podrem incorporar també els diferents tipus de deformacions (elàstica, plàstica i de trencament) que poden experimentar els objectes simulats. També, aquest treball intenta ser una bona introducció en el camp de la simulació de materials des del punt de vista d'un enginyer informàtic, sense assumir coneixements previs de mecànica dels medis continus, mètodes numèrics, i tècniques de simulació, tan basades en elements finits (FEM) com en el mateix MPM. Per això, aquest document es redacta intentant explicar els múltiples conceptes necessaris per entendre el funcionament dels simuladors actuals. S'han inclòs capítols i apèndixs, així com les referències a la corresponent literatura pròpia d'aquest camp. Finalment s'ha desenvolupat un simulador 3D de materials deformables seguint el model de MPM-MLS, juntament amb una interfície interactiva que permet definir una escena amb els respectius materials per fer-ne la simulació, i posterior representació gràfica, emmagatzematge i exportació.One of the most important branches of computer animation is the Physic Simulation of objects' behavior in a scene. It is usually wanted to obtain results that visually behave as real objects, and thus it is important to use the mathematical models that define their behavior. The fact that the validation in many cases is visual, allows to simplify such mathematical models to gain calculation speed or to decrease the complexity of what would be an engineering Simulation. However, always fitting the possible simplifications to a final behavior visually realistic. The objects with higher difficulty when it comes to simulate them are deformable objects, the behavior of which is defined by continuum mechanics. In this category we can find from fluids to different types of elastic materials. With this we will be able to simulate from water to a rubber ball, through sand or objects almost rigid that get permanently deformed (plastic deformation). The change in materials is given by the parameters that will be used in the Simulations, such as density, viscosity, elasticity, etc. Because of this we are interested in using a Simulation model that allows to change and experiment with all this values. In this document we delve into MPM (material point method) which is a hybrid method based in particles and meshes, adaptable enough and efficient to conduct a wide spectrum of Simulations with multiple materials. With this method we can incorporate the different types of deformations (elastic, plastic and tear) that the simulated objects can experience. Also, this document tries to be a good introduction to the material Simulation field from the point of view of a computer scientist, without assuming previous knowledge of continuum mechanics, numerical methods, and Simulation techniques, either based on finite element methods (FEM) or in MPM itself. Thereby, this text is written in order to explain the multiple necessary concepts to understand the workings of actual simulators. Chapters, appendixes, and references to the corresponding literature of the field are included. Finally a 3D simulator for deformable materials has been developed following the MPM-MLS model, altogether with an interactive interface that allows the definition of a scene with its own materials to simulate, and succeeding graphical representation, storage and exportation

Papukchiev A - One of the best experts on this subject based on the ideXlab platform.

  • Advanced Multi-Physics Simulation for Reactor Safety in the framework of the NURESAFE Project
    Annals of Nuclear Energy, 2015
    Co-Authors: B. Chanaron, Victor Sanchez, Nicolas Crouzet, C. Ahnert, Nikola Kolev, Olivier Marchand, A. Soeren, Papukchiev A
    Abstract:

    Since some years, there is a worldwide trend to move towards "higher-fidelity" Simulation techniques in reactor analysis. One of the main objectives of the research in this area is to enhance the prediction capability of the computations used for safety demonstration of the current LWR nuclear power plants through the dynamic 3D coupling of the codes simulating the different Physics of the problem into a common multi-Physic Simulation scheme. In this context, the NURESAFE European project aims at delivering to the European stakeholders an advanced and reliable software capacity usable for safety analysis needs of present and future LWR reactors and developing a high level of expertise in Europe in the proper use of the most recent Simulation tools including uncertainty assessment to quantify the margins toward feared phenomena occurring during an accident. This software capacity is based on the NURESIM European Simulation platform created during FP6 NURESIM project which includes advanced core Physics, two-phase thermal-hydraulics, fuel modeling and multi-scale and multi-Physics features together with sensitivity and uncertainty tools. These Physics are fully integrated into the platform in order to provide a standardized state-of-the-art code system to support safety analysis of current and evolving LWRs.

Xing Min Huang - One of the best experts on this subject based on the ideXlab platform.

  • Physic Simulation of slurry preparation by ultrasonic vibration in semisolid metal processing
    Materials Science Forum, 2011
    Co-Authors: Junwen Zhao, Jing Han, Guang Ze Dai, Xing Min Huang
    Abstract:

    In current research, a series of visualization experiments simulating the action of ultrasonic vibration (UV) in metal slurry preparation process on fluid flow, grain nucleation and growth as well as its interaction with viscosity of fluids were conducted. In these visualization experiments, the metal slurry maker was substituted by a transparent cup while the liquid and semisolid slurry of metal were replaced by other fluids or mixture system with similar characteristics. Scaled-up UV was applied to the liquid or mixture systems. The Simulation shows that UV can roll up the particles at the bottom of the cup and make the liquid convection intense below the radiating surface of sonotrode while weak above it. UV can break dendrites rapidly and distribute them in melt. High viscosity reduces the actual power transmitted into liquid, and higher viscosity requires higher inception power of UV.

B. Chanaron - One of the best experts on this subject based on the ideXlab platform.

  • Advanced Multi-Physics Simulation for Reactor Safety in the framework of the NURESAFE Project
    Annals of Nuclear Energy, 2015
    Co-Authors: B. Chanaron, Victor Sanchez, Nicolas Crouzet, C. Ahnert, Nikola Kolev, Olivier Marchand, A. Soeren, Papukchiev A
    Abstract:

    Since some years, there is a worldwide trend to move towards "higher-fidelity" Simulation techniques in reactor analysis. One of the main objectives of the research in this area is to enhance the prediction capability of the computations used for safety demonstration of the current LWR nuclear power plants through the dynamic 3D coupling of the codes simulating the different Physics of the problem into a common multi-Physic Simulation scheme. In this context, the NURESAFE European project aims at delivering to the European stakeholders an advanced and reliable software capacity usable for safety analysis needs of present and future LWR reactors and developing a high level of expertise in Europe in the proper use of the most recent Simulation tools including uncertainty assessment to quantify the margins toward feared phenomena occurring during an accident. This software capacity is based on the NURESIM European Simulation platform created during FP6 NURESIM project which includes advanced core Physics, two-phase thermal-hydraulics, fuel modeling and multi-scale and multi-Physics features together with sensitivity and uncertainty tools. These Physics are fully integrated into the platform in order to provide a standardized state-of-the-art code system to support safety analysis of current and evolving LWRs.

Gumrowi Ahmad - One of the best experts on this subject based on the ideXlab platform.

  • MENINGKATKAN HASIL BELAJAR MATERI GELOMBANG MENGGUNAKAN SIMULASI CROCODILE PhysicS PADA MODEL THINK- PAIR-SHARE
    'Muhammadiyah Metro University', 2020
    Co-Authors: Gumrowi Ahmad
    Abstract:

    This action research aims at increasing students' achievement on the topic Gelombang for the second year studens of MAN 1 Pesisir Barat by using Crocodile Physic Simulation of Think-Pair-Share model. The students' achievement on the wave topic is the research's object, whereas the subject of the research is the students of MAN 1 Pesisir Barat.This action research is conducted within three cycles. Each cycle consists of plan, action, observation and reflection. Based on the result of analysis it is found that Crocodile Physics Simulation of Think-Pair-Share model is able to increase the students' achievement of the wave topic.The average students achievement increases from 58,77 becomes 65,70 or 11,80% increasingly during Cycle I, increases from 65,70 to 71,37 or 8,63% during Cycle II, and increases up to 74,30 or 4,11% in Cycle III. By comparing between Pre Research and Cycle III there is 26,43% increases. Besides, the completeness of learning increases from 26,67 during Pre Research to 46,67 during Cycle I, increases 63,33 during Cycle II and becomes 86,67 in Cycle III. By comparing the 58,77 during Pre Researçh there is an increasing students achievement up to 60%