HECToR-enabled Step Change in Turbulent Multiphase Combustion Simulation

在过去的几年里，我们集中精力研究了一类相对较新的湍流多相燃烧，即被液相稀释的湍流燃烧。这种稀释燃烧不同于传统的喷雾燃烧（如柴油发动机），在几种低排放高效能源系统和消防安全中有应用。通过系统的方法和一系列的期刊和会议出版物，我们已经建立了一个现象的计算原型，它是通用的，现象丰富的，科学上有趣的，但计算上可行的（在HEC上！）和高效的。HECToR phase 2a和2b为紊流多相燃烧的高级模拟提供了前所未有的机会。特别是新的Baker系统，峰值速度约为340 Tflops和60 TB可用，预计由44,544个内核（2x12内核芯片和每个节点32GB内存）组成，理论上峰值约为340TF。我们的目标是在HECToR上进行具有里程碑意义的紊流多相稀释燃烧模拟，以便在我们对关键现象的理解上做出一步改变，并有可能优化该技术的应用。在Baker系统上，我们将在多达12000个岩心上进行湍流燃烧的DNS，通过蒸发液滴按尺寸和复杂程度递增进行稀释。之后，晶格玻尔兹曼方法将与DNS动态耦合，形成紊流燃烧中完全分解液滴的多尺度模拟。研究结果将发表在国际顶级期刊上，有望推动基础知识的发展，并在长期内对社会和行业产生影响。

Over the past few years, we have concentrated efforts on a relatively new class of turbulent multiphase combustion, that is, turbulent combustion diluted by a liquid phase. Such diluted combustion is different from the conventional spray combustion (e.g. in diesel engines) and has applications in several low-emission high-efficiency energy systems and fire safety. Through a systematic approach and a series of jounral and conference publications, we have established a computational prototype of the phenomena, which is generic, phenomena-rich, scientifically interesting yet computationally amenable (on HEC!) and efficient. HECToR Phases 2a and 2b offer unprecedented opportunities for advanced simulations in turbulent multiphase combustion. The new Baker system, in particular, will have a peak speed of about 340 Tflops and 60 TB available, which is anticipated to consist of 44,544 cores (2x12 core chips and 32GB memory per node) giving a theoretical peak of around 340TF.We aim to conduct landmark simulations of turbulent multiphase diluted combustion on HECToR in order to make a step change in our understanding of key phenomena and potentially optimize applications of the technology. On the Baker system, we will conduct DNS of turbulent combustion diluted by evaporating droplets in order of increasing size and sophistication on up to 12,000 cores. Thereafter, the Lattice Boltzmann Method will be dynamically coupled with DNS to form a multi-scale simulation of fully resolved droplets in turbulent combustion. The results will be published in top international journals, promising to advance fundamental knowledge and impact on society and industry in the longer term.