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种相对较新的湍流多相燃烧，即被液体稀释的湍流燃烧。这种稀释燃烧不同于传统的喷雾燃烧(例如在柴油机上)，在一些低排放、高效率的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、具有科学趣味性的，但在计算上是可行的(在HEC！)而且效率很高。Hector阶段2a和2b为湍流多相燃烧的高级模拟提供了前所未有的机会。特别是，新的贝克系统将具有约340 TFLOPS的峰值速度和60 TB的可用容量，预计由44,544个内核(2x12内核芯片和每节点32 GB内存)组成，理论峰值约为340TF。我们的目标是在赫克托上进行里程碑式的多相湍流稀释燃烧模拟，以改变我们对关键现象的理解，并潜在地优化该技术的应用。在贝克系统上，我们将对多达12,000个岩芯进行由蒸发液滴稀释的湍流燃烧的域名系统，按大小和复杂性的顺序递增。然后，将格子Boltzmann方法与直接数值模拟相结合，对湍流燃烧过程中的液滴进行多尺度数值模拟。研究结果将发表在顶级国际期刊上，有望促进基础知识的发展，并在较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.