CAREER: New Directions in the Variational Multiscale Formulation of Large Eddy Simulation

建议没有。研究方向：大涡模拟的变分多尺度公式的新方向在过去的三十年中，大涡模拟（LES）已经成为模拟湍流的重要技术，在环境，航空航天，汽车，海洋和材料加工研究和工业中得到了应用。LES使用的增长是由需要大规模漩涡分辨率的应用程序以及大规模并行计算机和负担得起的工作站集群的出现推动的。这导致了几种新的有前途的LES公式的发展，包括变分多尺度（VMS）方法。这项拨款所资助的研究，将会在整体上推动低碳系统的发展，特别是低碳系统的VMS配方。将推导出新的、鲁棒的和精确的VMS模型，开发用于复杂几何形状流动的算法，将VMS概念扩展到湍流混合和可压缩流动，并进行系统研究以评估所提出的模型和方法。动态VMS的发展可以对LES模拟产生有益的影响，特别是如果它们在实际应用中得到证明。教育计划包括高中阶段的活动、本科阶段的课程改进和研究生阶段的课程开发。教育重点以开发和使用计算模块的形式提出，让学生用简单的流程进行“实验”。通过利用计算机模拟来可视化隐藏的物理现象，并进行刺激的虚拟实验，科学和工程将对高中生来说更容易理解和“有趣”。高中教师和学生将接受波传播和流体力学方面的培训。在本科和研究生阶段，学生将在流体力学、数值模拟和湍流建模方面接受严格的训练。在所有级别，将努力雇用来自科学和工程领域代表性不足群体的学生。

PROPOSAL NO.: CTS-0449151PRINCIPAL INVESTIGATORS: ASSAD OBERAIINSTITUTION: BOSTON UNIVERSITYCAREER: NEW DIRECTIONS IN THE VARIATIONAL MULTISCALE FORMULATION OF LARGE EDDY SIMULATIONOver the last three decades, Large Eddy Simulation (LES) has emerged as an important technique in simulating turbulent flows, with applications in environmental, aerospace, automotive, marine, and material processing research and industry. The growth in the use of LES has been spurred by applications where the resolution of large scale eddies is necessary, and by the advent of massively parallel computers and affordable workstation clusters. This has resulted in the development of several new promising LES formulations, including the variational multiscale (VMS) method. The research funded by this grant will advance the state-of-the-art in LES in general, and the VMS formulation of LES in particular. New, robust and accurate VMS models will be derived, algorithms for their application to flows in complex geometries will be developed, the VMS concept will be extended to turbulent mixing and compressible flows, and systematic studies will be performed to evaluate the proposed models and methods. The development of dynamic VMS could have a beneficial impact on LES simulations, especially if their use in practical applications is demonstrated. The educational program includes activities at the high school level, course improvement at the undergraduate level, and course development at the graduate level. Educational emphasis is proposed in the form of development and use of computational modules for students to "experiment" with simple flows. Science and engineering will be made more accessible and "fun" to high-school students by utilizing computer simulations to visualize hidden physical phenomena and to perform stimulating virtual experiments. High school teachers and students will be trained in topics on wave propagation and fluid mechanics. At undergraduate and graduate levels, students will be rigorously trained in fluid mechanics, numerical simulations and turbulence modeling. At all levels, efforts will be made to hire students from underrepresented groups in science and engineering.