Multiphase Large Eddy Simulations

多相大涡模拟

• 批准号: 395172569
• 负责人: Dr.-Ing. Thomas Ziegenhein
• 金额: --
• 依托单位: School for Engineering of Matter, Transport and Energy
• 依托单位国家: 德国
• 项目类别: Research Fellowships
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/395172569?language=en
• 关键词: Multiphase; Large; Eddy; Simulations

One of the main pillars in single-phase computational fluid dynamics is filtering in the context of Large Eddy Simulations (LES) providing accurate results with relatively low computational costs. By extending this idea to multiphase flows, a filtered interface needs to be handled in addition to the filtered turbulence. Although filtered interfaces in turbulent flows have been mathematically described in the last decade, methods as well as closure models are not well established for this problem. A general method for such LES-like multiphase flow descriptions can lead into a new direction in multiphase computational fluid dynamics like the introduction of single-phase flow LES did in the 70s of the last century. New methods will be available for investigating complex multiphase problems, which would be positioned between the established fully resolved and unresolved methods.A very promising method for handling filtered interfaces with focus on the primary break-up of sprays was developed by Prof. Herrmann in Tempe, Arizona. This method will be extended to bubbly flows during the post-doc period. This includes the advancement of the present method, implementing new closure models, and detailed verification and validation with data from direct numerical simulations as well as from experiments. Finally, the simulation of complex multiphase problems that are exceeding the possibilities of the established methods will show the high potential of the new approach. For the applicant personally, the stay will enable him to do active research in the area of filtered interfaces in his own junior research group. For this purpose, the learned skills and the built scientific network during the post-doc period will be the fundament. This research interest in LES-like multiphase flow simulations is unique in Germany and it will bridge the established research groups dealing with fully resolved and non-resolved interfaces.

单相计算流体动力学的主要支柱之一是在大涡模拟（LES）的背景下进行滤波，以相对较低的计算成本提供准确的结果。通过将这一思想扩展到多相流，除了过滤湍流之外，还需要处理过滤界面。虽然在过去的十年中，湍流中的过滤界面已被数学描述，方法以及封闭模型没有很好地建立这个问题。类似于上个世纪70年代单相流大涡模拟的引入，一种通用的多相流大涡模拟方法可以为多相流计算流体动力学开辟一个新的方向。新的方法将可用于研究复杂的多相问题，这将位于已建立的完全解决和未解决的方法之间。一个非常有前途的方法，处理过滤界面，重点是初级破碎的喷雾滕佩，亚利桑那州的Herrmann教授开发的。该方法将在博士后期间扩展到泡状流。这包括本方法的进步，实现新的封闭模型，并详细的验证和验证数据直接数值模拟以及实验。最后，对复杂多相问题的模拟超出了现有方法的可能性，将显示新方法的巨大潜力。对于申请人个人来说，逗留将使他能够在自己的初级研究小组中积极研究过滤界面领域。为此，在博士后期间学习的技能和建立的科学网络将是基础。这种研究兴趣在LES一样的多相流模拟是独一无二的，在德国，它将桥梁建立研究小组处理完全解决和非解决接口。