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首页> 美国政府科技报告 >Development of a 3-D Defocusing Liquid Crystal Particle Thermometry and Velocimetry (3DDLCPTV) System
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Development of a 3-D Defocusing Liquid Crystal Particle Thermometry and Velocimetry (3DDLCPTV) System

机译：开发三维散焦液晶粒子温度测量和测速（3DDLCpTV）系统

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One of the most intriguing and perplexing problems in fluid mechanics today, as it was 50 years ago, is that of turbulence. The behavior of a fluid in turbulent regions around an object consists of chaotic flow phenomena made of unsteady vortices on many scales that can critically affect the ability of that object to pass through the fluid. Indeed, turbulent convective heat and mass transfer is one of the frequently encountered problems at all levels of applied engineering. While countless research efforts are devoted to understanding turbulent phenomena, this chaotic motion which also consists of random fluctuations in temperature, velocity, pressure, and fluid properties as well as advanced mixing (among other things), has yet to be solved analytically. As a result, understanding this flow requires the use of numerical methods. While turbulent behavior can be resolved through Direct Numerical Simulation (DNS) of the Navier-Stokes Equations, this method is extremely computationally intensive and cannot be practically implemented with today's computing power in flows with Reynolds numbers above approximately 104 or 105. As a result, other methods must be used that can approximate turbulent behavior with flow modeling.

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