Experimental and Numerical Studies of Vorticity Dynamics and Passive Scalar Mixing in a Turbulent Mixing Layer

摘要 提案编号：CTS-9618627 首席研究员：Wallace 这是对湍流混合层的实验和数值研究，重点关注涡度和被动标量场的特性。 涡度场的结构和动力学将通过矩和谱的检查以及涡度场的联合概率密度分析，通过统计手段来研究。 流动的三维可视化将从伴随的大涡模拟中获得，以产生涡度场特性的完整图像。 实验和数值计算都将扩展到详细研究无源标量的通量，目的是突出控制标量输运的物理现象。 将研究统计数据和瞬时场，并评估雷诺平均纳维-斯托克斯方程的标量输运模型的性能。

ABSTRACT Proposal Number: CTS-9618627 Principal Investigator: Wallace This is an experimental and numerical study of the turbulent mixing layer, focusing on the properties of the vorticity and passive scalar fields. The structure and dynamics of the vorticity field will be studied by statistical means through an examination of the moments and spectra, as well as by the joint-probability-density analysis of the vorticity field. Three-dimensional visualizations of the flow will be obtained from the accompanying large-eddy simulation to yield a complete picture of the properties of the vorticity field. Both experiments and numerical calculations will be extended to investigate in detail the fluxes of a passive scalar, with the purpose of highlighting the physical phenomena that govern scalar transport. Statistical data and instantaneous fields will be studied, and the performance of scalar transport models for the Reynolds-averaged Navier-Stokes equations will be evaluated.