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

提案编号： CTS-0449151主要供应商：ASSAD OBERAI机构： 波士顿大学职业生涯：大涡模拟变分多尺度方法的新方向在过去的三十年里，大涡模拟（LES）已经成为模拟湍流流动的一种重要技术，在环境、航空航天、汽车、船舶和材料加工研究和工业中有着广泛的应用。大涡模拟的应用需要大规模涡的分辨率，以及大规模并行计算机和负担得起的工作站集群的出现，刺激了大涡模拟应用的增长。 这导致了几个新的有前途的LES配方，包括变分多尺度（VMS）方法的发展。 这项拨款资助的研究将推动LES的最新发展，特别是LES的VMS制定。 将导出新的、稳健的和准确的VMS模型，将开发用于复杂几何形状流动的算法，VMS概念将扩展到湍流混合和可压缩流动，并将进行系统的研究，以评估拟议的模型和方法。 动态VMS的发展可能会产生有益的影响LES模拟，特别是如果他们在实际应用中的使用证明。 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。 教育的重点是提出的形式的发展和使用的计算模块，让学生“实验”与简单的流程。 科学和工程将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，使高中学生更容易获得和“有趣”。 高中教师和学生将接受关于波传播和流体力学的培训。在本科和研究生阶段，学生将接受严格的流体力学，数值模拟和湍流建模培训。在所有各级，将努力从科学和工程专业代表性不足的群体中雇用学生。

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.