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

项目编号：CTS-9618627项目负责人：Wallace对湍流混合层进行了实验和数值研究，重点研究了涡量场和被动标量场的特性。涡度场的结构和动力学将通过对矩和谱的检验，以及涡度场的联合概率-密度分析，用统计方法来研究。流动的三维可视化将从附带的大涡模拟中获得，以获得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被动标量的通量，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reynolds -average Navier-Stokes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.