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<span id="openzim-page-title" class="mw-page-title-main"><span class="mw-page-title-main">Multiscale modeling</span></span>
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<p><b>Multiscale modeling</b> or <b>multiscale mathematics</b> is the <a href="Branches_of_science" title="Branches of science">field</a> of solving problems that have important features at multiple scales of time and/or space. Important problems include multiscale modeling of fluids,<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Steinhauser_20082_2-0" class="reference"><a href="#cite_note-Steinhauser_20082-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> solids,<sup id="cite_ref-Steinhauser_20082_2-1" class="reference"><a href="#cite_note-Steinhauser_20082-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> polymers,<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Baeurle_20092_6-0" class="reference"><a href="#cite_note-Baeurle_20092-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> proteins,<sup id="cite_ref-7" class="reference"><a href="#cite_note-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:0_8-0" class="reference"><a href="#cite_note-:0-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_9-0" class="reference"><a href="#cite_note-:1-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_10-0" class="reference"><a href="#cite_note-:2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> <a href="Nucleic_acids" class="mw-redirect" title="Nucleic acids">nucleic acids</a><sup id="cite_ref-de_Pablo_20112_11-0" class="reference"><a href="#cite_note-de_Pablo_20112-11"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> as well as various physical and chemical phenomena (like adsorption, chemical reactions, <a href="Diffusion" title="Diffusion">diffusion</a>).<sup id="cite_ref-:1_9-1" class="reference"><a href="#cite_note-:1-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Knizhnik2_12-0" class="reference"><a href="#cite_note-Knizhnik2-12"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-Adams2_13-0" class="reference"><a href="#cite_note-Adams2-13"><span class="cite-bracket">[</span>13<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-14" class="reference"><a href="#cite_note-14"><span class="cite-bracket">[</span>14<span class="cite-bracket">]</span></a></sup>
</p><p>An example of such problems involve the <a href="Navier%E2%80%93Stokes_equations" title="Navier–Stokes equations">Navier–Stokes equations</a> for incompressible fluid flow.
</p><p><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle {\begin{array}{lcl}\rho _{0}(\partial _{t}\mathbf {u} +(\mathbf {u} \cdot \nabla )\mathbf {u} )=\nabla \cdot \tau ,\\\nabla \cdot \mathbf {u} =0.\end{array}}}">
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<annotation encoding="application/x-tex">{\displaystyle {\begin{array}{lcl}\rho _{0}(\partial _{t}\mathbf {u} +(\mathbf {u} \cdot \nabla )\mathbf {u} )=\nabla \cdot \tau ,\\\nabla \cdot \mathbf {u} =0.\end{array}}}</annotation>
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</math></span><img src="./7ac19e8c8b8f531320f49e835d8768aa61503a01.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -2.505ex; width:28.16ex; height:6.176ex;" alt="{\displaystyle {\begin{array}{lcl}\rho _{0}(\partial _{t}\mathbf {u} +(\mathbf {u} \cdot \nabla )\mathbf {u} )=\nabla \cdot \tau ,\\\nabla \cdot \mathbf {u} =0.\end{array}}}" loading="lazy"></span>
</p><p>In a wide variety of applications, the stress tensor <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \tau }">
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</math></span><img src="./38a7dcde9730ef0853809fefc18d88771f95206c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.202ex; height:1.676ex;" alt="{\displaystyle \tau }" loading="lazy"></span> is given as a linear function of the gradient <span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \nabla u}">
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</math></span><img src="./38a7dcde9730ef0853809fefc18d88771f95206c.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.338ex; width:1.202ex; height:1.676ex;" alt="{\displaystyle \tau }" loading="lazy"></span> has been proven to be sufficient for describing the dynamics of a broad range of fluids. However, its use for more complex fluids such as polymers is dubious. In such a case, it may be necessary to use multiscale modeling to accurately model the system such that the stress tensor can be extracted without requiring the computational cost of a full microscale simulation.<sup id="cite_ref-15" class="reference"><a href="#cite_note-15"><span class="cite-bracket">[</span>15<span class="cite-bracket">]</span></a></sup>
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<div class="mw-heading mw-heading2"><h2 id="History">History</h2></div>
<p>Horstemeyer 2009,<sup id="cite_ref-Horstemeyer_2009_16-0" class="reference"><a href="#cite_note-Horstemeyer_2009-16"><span class="cite-bracket">[</span>16<span class="cite-bracket">]</span></a></sup> 2012<sup id="cite_ref-Horstemeyer_2012_17-0" class="reference"><a href="#cite_note-Horstemeyer_2012-17"><span class="cite-bracket">[</span>17<span class="cite-bracket">]</span></a></sup> presented a historical review of the different disciplines (mathematics, physics, and materials science) for solid materials related to multiscale materials modeling.
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<p>The recent surge of multiscale modeling from the smallest scale (atoms) to full system level (e.g., autos) related to solid mechanics that has now grown into an international multidisciplinary activity was birthed from an unlikely source. Since the US Department of Energy (DOE) national labs started to reduce nuclear underground tests in the mid-1980s, with the last one in 1992, the idea of simulation-based design and analysis concepts were birthed. Multiscale modeling was a key in garnering more precise and accurate predictive tools. In essence, the number of large-scale systems level tests that were previously used to validate a design was reduced to nothing, thus warranting the increase in simulation results of the complex systems for design verification and validation purposes.
</p><p>Essentially, the idea of filling the space of system-level “tests” was then proposed to be filled by simulation results. After the Comprehensive Test Ban Treaty of 1996 in which many countries pledged to discontinue all systems-level nuclear testing, programs like the Advanced Strategic Computing Initiative (ASCI) were birthed within the Department of Energy (DOE) and managed by the national labs within the US. Within ASCI, the basic recognized premise was to provide more accurate and precise simulation-based design and analysis tools. Because of the requirements for greater complexity in the simulations, parallel computing and multiscale modeling became the major challenges that needed to be addressed. With this perspective, the idea of experiments shifted from the large-scale complex tests to multiscale experiments that provided material models with validation at different length scales. If the modeling and simulations were physically based and less empirical, then a predictive capability could be realized for other conditions. As such, various multiscale modeling methodologies were independently being created at the DOE national labs: Los Alamos National Lab (LANL), Lawrence Livermore National Laboratory (LLNL), Sandia National Laboratories (SNL), and Oak Ridge National Laboratory (ORNL). In addition, personnel from these national labs encouraged, funded, and managed academic research related to multiscale modeling. Hence, the creation of different methodologies and computational algorithms for parallel environments gave rise to different emphases regarding multiscale modeling and the associated multiscale experiments.
</p><p>The advent of parallel computing also contributed to the development of multiscale modeling. Since more degrees of freedom could be resolved by parallel computing environments, more accurate and precise algorithmic formulations could be admitted. This thought also drove the political leaders to encourage the simulation-based design concepts.
</p><p>At LANL, LLNL, and ORNL, the multiscale modeling efforts were driven from the materials science and physics communities with a bottom-up approach. Each had different programs that tried to unify computational efforts, materials science information, and applied mechanics algorithms with different levels of success. Multiple scientific articles were written, and the multiscale activities took different lives of their own. At SNL, the multiscale modeling effort was an engineering top-down approach starting from continuum mechanics perspective, which was already rich with a computational paradigm. SNL tried to merge the materials science community into the continuum mechanics community to address the lower-length scale issues that could help solve engineering problems in practice.
</p><p>Once this management infrastructure and associated funding was in place at the various DOE institutions, different academic research projects started, initiating various satellite networks of multiscale modeling research. Technological transfer also arose into other labs within the Department of Defense and industrial research communities.
</p><p>The growth of multiscale modeling in the industrial sector was primarily due to financial motivations. From the DOE national labs perspective, the shift from large-scale systems experiments mentality occurred because of the 1996 Nuclear Ban Treaty. Once industry realized that the notions of multiscale modeling and simulation-based design were invariant to the type of product and that effective multiscale simulations could in fact lead to design optimization, a paradigm shift began to occur, in various measures within different industries, as cost savings and accuracy in product warranty estimates were rationalized.
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<div style="padding-bottom: 0; padding-top: 0.5em"><cite class="left-aligned" style=""><a href="Mark_Horstemeyer" title="Mark Horstemeyer">Mark Horstemeyer</a>, <i>Integrated Computational Materials Engineering (ICME) for Metals</i>, Chapter 1, Section 1.3.</cite></div>
</div>
<p>The aforementioned DOE multiscale modeling efforts were hierarchical in nature. The first concurrent multiscale model occurred when Michael Ortiz (Caltech) took the molecular dynamics code Dynamo, developed by <a href="Michael_Baskes" title="Michael Baskes">Mike Baskes</a> at Sandia National Labs, and with his students embedded it into a finite element code for the first time.<sup id="cite_ref-18" class="reference"><a href="#cite_note-18"><span class="cite-bracket">[</span>18<span class="cite-bracket">]</span></a></sup> <a href="Martin_Karplus" title="Martin Karplus">Martin Karplus</a>, <a href="Michael_Levitt_(biophysicist)" title="Michael Levitt (biophysicist)">Michael Levitt</a>, and <a href="Arieh_Warshel" title="Arieh Warshel">Arieh Warshel</a> received the Nobel Prize in Chemistry in 2013 for the development of a multiscale model method using both classical and quantum mechanical theory which were used to model large complex chemical systems and reactions.<sup id="cite_ref-:0_8-1" class="reference"><a href="#cite_note-:0-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:1_9-2" class="reference"><a href="#cite_note-:1-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-:2_10-1" class="reference"><a href="#cite_note-:2-10"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Areas_of_research">Areas of research</h2></div>
<p>In physics and chemistry, multiscale modeling is aimed at the calculation of material properties or system behavior on one level using information or models from different levels. On each level, particular approaches are used for the description of a system. The following levels are usually distinguished: level of <a href="Quantum_mechanical_model" class="mw-redirect" title="Quantum mechanical model">quantum mechanical models</a> (information about electrons is included), level of <a href="Molecular_dynamics" title="Molecular dynamics">molecular dynamics</a> models (information about individual atoms is included), <a href="Coarse-grained_modeling" title="Coarse-grained modeling">coarse-grained models</a> (information about atoms and/or groups of atoms is included), mesoscale or nano-level (information about large groups of atoms and/or molecule positions is included), level of continuum models, level of device models. Each level addresses a phenomenon over a specific window of length and time. Multiscale modeling is particularly important in <a href="Integrated_computational_materials_engineering" title="Integrated computational materials engineering">integrated computational materials engineering</a> since it allows the prediction of material properties or system behavior based on knowledge of the process-structure-property relationships.
</p><p>In <a href="Operations_research" title="Operations research">operations research</a>, multiscale modeling addresses challenges for decision-makers that come from multiscale phenomena across organizational, temporal, and spatial scales. This theory fuses <a href="Decision_theory" title="Decision theory">decision theory</a> and multiscale mathematics and is referred to as <a href="Multiscale_decision-making" title="Multiscale decision-making">multiscale decision-making</a>. Multiscale decision-making draws upon the analogies between physical systems and complex man-made systems.
</p><p>In meteorology, multiscale modeling is the modeling of the interaction between weather systems of different spatial and temporal scales that produces the weather that we experience. The most challenging task is to model the way through which the weather systems interact as models cannot see beyond the limit of the model grid size. In other words, to run an atmospheric model that is having a grid size (very small ~ <span class="nowrap">500 m</span>) which can see each possible cloud structure for the whole globe is computationally very expensive. On the other hand, a computationally feasible <a href="Global_climate_model" class="mw-redirect" title="Global climate model">Global climate model</a> (GCM), with grid size ~ <span class="nowrap">100 km</span>, cannot see the smaller cloud systems. So we need to come to a balance point so that the model becomes computationally feasible and at the same time we do not lose much information, with the help of making some rational guesses, a process called parametrization.
</p><p>Besides the many specific applications, one area of research is methods for the accurate and efficient solution of multiscale modeling problems. The primary areas of mathematical and algorithmic development include:
</p>
<ul><li><a href="Analytical_mechanics" title="Analytical mechanics">Analytical modeling</a></li>
<li><a href="Center_manifold" title="Center manifold">Center manifold</a> and <a href="Slow_manifold" title="Slow manifold">slow manifold</a> theory</li>
<li><a href="Continuum_mechanics" title="Continuum mechanics">Continuum modeling</a></li>
<li><a href="Discrete_modeling" class="mw-redirect" title="Discrete modeling">Discrete modeling</a></li>
<li><a href="Network_theory" title="Network theory">Network-based modeling</a></li>
<li><a href="Statistical_mechanics" title="Statistical mechanics">Statistical modeling</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2></div>
<ul><li><a href="Computational_mechanics" title="Computational mechanics">Computational mechanics</a></li>
<li><a href="Equation-free_modeling" title="Equation-free modeling">Equation-free modeling</a></li>
<li><a href="Integrated_computational_materials_engineering" title="Integrated computational materials engineering">Integrated computational materials engineering</a></li>
<li><a href="Multilevel_model" title="Multilevel model">Multilevel model</a></li>
<li><a href="Multiphysics" class="mw-redirect" title="Multiphysics">Multiphysics</a></li>
<li><a href="Multiresolution_analysis" title="Multiresolution analysis">Multiresolution analysis</a></li>
<li><a href="Space_mapping" title="Space mapping">Space mapping</a></li></ul>
<div class="mw-heading mw-heading2"><h2 id="References">References</h2></div>
<div class="mw-references-wrap mw-references-columns"><ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">
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<div class="mw-heading mw-heading2"><h2 id="Further_reading">Further reading</h2></div>
<ul><li><cite id="CITEREFHosseiniShah2009" class="citation journal cs1">Hosseini, SA; Shah, N (2009). "Multiscale modelling of hydrothermal biomass pretreatment for chip size optimization". <i>Bioresource Technology</i>. <b>100</b> (9): <span class="nowrap">2621–</span>8. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2009BiTec.100.2621H">2009BiTec.100.2621H</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1016%2Fj.biortech.2008.11.030">10.1016/j.biortech.2008.11.030</a>. <a href="PMID_(identifier)" class="mw-redirect" title="PMID (identifier)">PMID</a> <a rel="nofollow" class="external text" href="https://pubmed.ncbi.nlm.nih.gov/19136256">19136256</a>.</cite></li>
<li><cite id="CITEREFTaoChernAtlasRandall2009" class="citation journal cs1">Tao, Wei-Kuo; Chern, Jiun-Dar; Atlas, Robert; Randall, David; Khairoutdinov, Marat; Li, Jui-Lin; Waliser, Duane E.; Hou, Arthur; et al. (2009). "A Multiscale Modeling System: Developments, Applications, and Critical Issues". <i>Bulletin of the American Meteorological Society</i>. <b>90</b> (4): <span class="nowrap">515–</span>534. <a href="Bibcode_(identifier)" class="mw-redirect" title="Bibcode (identifier)">Bibcode</a>:<a rel="nofollow" class="external text" href="https://ui.adsabs.harvard.edu/abs/2009BAMS...90..515T">2009BAMS...90..515T</a>. <a href="Doi_(identifier)" class="mw-redirect" title="Doi (identifier)">doi</a>:<a rel="nofollow" class="external text" href="https://doi.org/10.1175%2F2008BAMS2542.1">10.1175/2008BAMS2542.1</a>. <a href="Hdl_(identifier)" class="mw-redirect" title="Hdl (identifier)">hdl</a>:<span class="id-lock-free" title="Freely accessible"><a rel="nofollow" class="external text" href="https://hdl.handle.net/2060%2F20080039624">2060/20080039624</a></span>.</cite></li></ul>
<div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://icme.hpc.msstate.edu/mediawiki/index.php/Main_Page">Mississippi State University ICME Cyberinfrastructure</a></li>
<li><a rel="nofollow" class="external text" href="https://www.cemf.ir/">Multiscale Modeling of Flow Flow</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20141017021247/http://www.chemie.unibas.ch/~steinhauser/index.html">Multiscale Modeling of Materials (MMM-Tools) Project at Dr. Martin Steinhauser's group at the Fraunhofer-Institute for High-Speed Dynamics, Ernst-Mach-Institut, EMI, at Freiburg, Germany. Since 2013, M.O. Steinhauser is associated at the University of Basel, Switzerland.</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080503073240/http://www-dick.chemie.uni-regensburg.de/group/stephan_baeurle/index.html">Multiscale Modeling Group: Institute of Physical & Theoretical Chemistry, University of Regensburg, Regensburg, Germany</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080220104618/http://www.mmm2008.org/bin/view.pl/Main/WebHome">Multiscale Materials Modeling: Fourth International Conference, Tallahassee, FL, USA</a></li>
<li><a rel="nofollow" class="external text" href="http://www.biocomp.chem.uw.edu.pl/multiscale_modeling.php">Multiscale Modeling Tools for Protein Structure Prediction and Protein Folding Simulations, Warsaw, Poland</a></li>
<li><a rel="nofollow" class="external text" href="http://www.e-xstream.com/applications/material-engineering/about-material-engineering">Multiscale modeling for Materials Engineering: Set-up of quantitative micromechanical models</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20190812193431/http://multiscale-modelling.eu/">Multiscale Material Modelling on High Performance Computer Architectures, MMM@HPC project</a></li>
<li><a rel="nofollow" class="external text" href="http://www.modelingmaterials.org"><i>Modeling Materials: Continuum, Atomistic and Multiscale Techniques</i> (E. B. Tadmor and R. E. Miller, Cambridge University Press, 2011)</a></li>
<li><a rel="nofollow" class="external text" href="https://www.youtube.com/watch?v=wbWlOZ3KWuw">An Introduction to Computational Multiphysics II: Theoretical Background Part I Harvard University video series</a></li>
<li><a rel="nofollow" class="external text" href="http://epubs.siam.org/MMS/">SIAM Journal of Multiscale Modeling and Simulation</a></li>
<li><a rel="nofollow" class="external text" href="http://www.begellhouse.com/journals/61fd1b191cf7e96f.html">International Journal for Multiscale Computational Engineering</a></li>
<li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20150123160454/http://multiscale.emsl.pnl.gov/">Department of Energy Summer School on Multiscale Mathematics and High Performance Computing</a></li>
<li><a rel="nofollow" class="external text" href="https://zenodo.org/record/854760">Multiscale Conceptual Model Figures for Biological and Environmental Science</a></li></ul></div><!--htdig_noindex--><div><div class="zim-footer">
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