Integrated Simulation at the Exascale: coupling, synthesis and performance

未来几年，百亿亿次计算机的到来不仅会带来更大、更高保真度和更快的计算，还会带来全新的模拟和建模类别。它将为我们设计、优化和预测高度复杂、耦合的工程和自然系统的能力开辟新的领域。由多个耦合物理过程控制的复杂问题的系统级模拟将成为可能，为创建新的、复杂的工程系统提供了机会，通过对相互作用的物理过程的有效计算机模拟，有可能极大地推进高优先级领域的进展和工程重大挑战。该项目汇集了计算科学、高性能计算、工程和计算数学领域的领先研究人员组成的多学科团队，以创建新的和必要的数学和软件工具，使具有耦合物理现象的集成系统的稳定、准确和高效的模拟成为可能。它将把严谨的数学分析与尖端的软件工具结合起来，提供新的工具，为科学和工程的计算开辟前沿。软件工具将是开源的，社区建设和知识交流将贯穿始终。高社会和工业影响的三大挑战问题将指导该项目的技术发展：-融合建模的耦合模拟，这将支持未来电网聚变能源系统的虚拟设计和优化，这将对减少二氧化碳排放产生变革；-碳中和飞行，特别是新型高能量密度电力推进系统，其中电磁、热、机械和流体过程是强耦合的；计算大型病毒结构行为的耦合模拟技术。

The arrival in the coming years of exascale computers will not just enable bigger, higher-fidelity and faster computations, but also whole new classes of simulation and modelling. It will open new frontiers in our ability to design, optimise and predict highly complex and coupled engineered and natural systems. System-level simulation of complex problems governed by multiple coupled physical processes will become possible, unlocking opportunities to create new, sophisticated engineered systems, with efficient computer simulations of interacting physical processes having the potential to greatly advance progress in high-priority areas and engineering grand challenges.This project draws together a multidisciplinary team of leading researchers in computational science, high-performance computing, engineering and computational mathematics to create new and necessary mathematical and software tools to make stable, accurate and efficient simulation of integrated systems with coupled physical phenomena possible. It will combine rigorous mathematical analysis with cutting edge software tools to deliver new tools that will open frontiers in computing for science and engineering. The software tools will be open-source, with community building and knowledge exchange a focus throughout. Three grand challenge problems of high social and industrial impact will direct the technical developments in this project:- Coupled simulation of fusion modelling, which will support the virtual design and optimisation of future fusion energy systems for the electricity grid, which will have a transformative on reducing CO2 emissions;- Carbon neutral flight, an in particular new high energy density electric propulsion systems in which the electromagnetic, thermal, mechanical and fluid process are strongly coupled; and- Coupled simulation techniques for computing the behaviour of large virus structures.