Detailed and Hybrid LES-Subgrid-Modelling of Nano-Particle-Synthesis in Spray-Flames

本研究项目的目标是对喷雾火焰合成纳米粒子的过程进行详细的数值研究。在SPP中进行的测量第一次允许通过将模拟结果与实验结果进行比较来适当地验证所需的物理模型和数值方法。纳米颗粒的合成将由不同详细的物理模型来描述，计划根据当地所需的精度在模型之间进行局部切换。为此目的进行了详细的准备工作，该研究所提供了单峰模型和分段模型的原型实施。这些模型将与内部大涡模拟(LES)CFD解算器相结合，该解算器专为在数千个处理器核心上进行高效高性能计算而设计。该研究项目的主要目标之一是为LES中尚未解决的量表找到和进一步发展合适的模型，尽管这些量表可以预期对结果产生重大影响，但大多数相关研究都忽略了这一点。只有这些模型才能对未来的半工业设备进行精确的数值预测，从而有可能对喷雾火焰合成过程中的复杂物理过程产生更深的理解。

The goal of this research project is a detailed numerical investigation of the nanoparticle synthesis from spray flames. The measurements that are carried out in the SPP allow, for the first time, a proper validation of the required physical models and numerical methods by comparing simulation results against experimental results. The nanoparticle synthesis will be described by differently detailed physical models, it is planned to switch locally between the models depending on the locally required precision. Elaborated preparations have been carried out for this purpose, prototype implementations of a monomodal model and a sectional model are available at the institute. These models will be coupled with an in-house large eddy simulation (LES) CFD solver that has been designed for efficient high-performance computing on several thousand processor cores. One of the major goals of the research project is the finding and further development of suitable models for the unresolved scales in the LES, which have been neglected in most of the respective studies although a significant impact of these scales on the results can be expected. Only these models enable precise numerical predictions of semi-industrial devices in the future, which have the potential to generate a deeper understanding of the complex physical processes during the spray flame synthesis.