CAREER: Non-equilibrium wall-bounded turbulent flows at high Reynolds numbers

1453633 larsson尽管工业和环境中的大多数流动都是湍流的，但我们对其行为的了解存在显着差距，特别是在非规范情况下（即流动不在平衡状态的情况）。这是本CAREER提案旨在覆盖的空白区域——用大涡模拟（LES）开发可压缩、非平衡湍流模拟的理论和模型。除了更广泛的科学影响外，还建议开展教育活动，重点是开发一种新的课堂软件工具，通过为流体动力学问题提供视觉答案，为本科生和研究生提供体验式学习。其他教育工作者也可以使用这个软件工具。本提案的目标是发明新的LES模型，可以准确地模拟靠近固体壁的非平衡湍流的行为（这些被称为壁模型）。这是目前可用的计算技术中一个关键但缺失的元素，这个问题的解决方案将打开一个我们能够预测的工程流程的全新领域。PI建议通过直接数值模拟具有代表性的流动情况来获得高保真的模拟数据，然后利用这些数据来开发和验证他的新模型。该项目的成功完成将使我们对接近固体壁的非平衡湍流的预测能力发生重大变化。

1453633LarssonEven though the majority of flows in industry and in the environment are turbulent, significant gaps exist in our knowledge of their behavior, especially in non-canonical cases (i.e., cases where the flow is not at equilibrium). This is the white space that this CAREER proposal aims to cover -- to develop theory and models for the simulation of compressible, non-equilibrium turbulent flows with Large Eddy Simulations (LES). In addition to the scientific broader impact, educational activities are proposed that are focused on the development of a new classroom software tool that can be used to provide experiential learning to undergraduate and graduate students by offering visual answers to fluid dynamics questions. The software tool would be available to other educators.The goal of this proposal is to invent new LES models that can accurately simulate the behavior of non-equilibrium turbulent flows close to solid walls (these are known as wall models). This is a critical yet missing element from currently available computational techniques, and the solution to this problem would open up a whole new area of engineering flows that we would be able to predict. The PI proposes to obtain high fidelity simulation data using direct numerical simulations of representative flow cases and then utilize these data to both develop and validate his new models. Successful completion of this project would constitute a step change in our predictive capabilities for non-equilibrium turbulent flows close to solid walls.