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Coanda Wall Jet Calculations Using One- and Two-Equation Turbulence Models

机译：使用一方程式和二方程式湍流模型计算柯恩达壁面射流

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摘要

The wall jet over a convex surface, the Coanda wall jet, has many potential technical applications, such as circulation control of airfoils. Reynolds-averaged Navier-Stokes is a potentially very powerful tool for Coanda wall jet calculations. A number of common linear eddy-viscosity turbulence models were used for Reynolds-averaged Navier-Stokes calculations of a turbulent Coanda wall jet experiment. Calculations were also carried out with an explicit algebraic stress model. The differences in the computed results were shown to be large depending on what turbulence model was employed. The k-ω model was then employed for three-dimensional Reynolds-averaged Navier-Stokes calculations where the downstream evolution of streamwise vortices in the turbulent wall jet was studied for various spanwise wavelengths and forcing amplitudes. It was found that a centrifugal instability of the turbulent mean flow may lead to the streamwise growth of longitudinal vortices. Beyond a certain disturbance amplitude threshold the relative phase of the vortices had a noticeable impact on the amplification rates and the mean flow characteristics were affected by the added wall normal momentum exchange.
机译：凸表面上的壁射流，即柯恩达壁射流，具有许多潜在的技术应用，例如机翼的循环控制。雷诺平均Navier-Stokes是用于柯恩达壁面射流计算的潜在非常强大的工具。许多常见的线性涡流-粘性湍流模型用于湍流柯恩达壁射流实验的雷诺平均Navier-Stokes计算。还使用显式代数应力模型进行了计算。结果表明，根据所采用的湍流模型，计算结果的差异很大。然后，将k-ω模型用于三维雷诺平均Navier-Stokes计算，其中研究了湍流壁面射流中流向涡旋的下游演变，以了解不同的展向方向波长和强迫振幅。已经发现，湍流平均流的离心不稳定性可能导致纵向涡流沿流方向生长。除了一定的扰动幅度阈值外，涡旋的相对相位对放大率有显着影响，并且平均流量特性受增加的壁法向动量交换的影响。

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  • 来源
    《AIAA Journal》 |2006年第9期|p.2095-2107|共13页
  • 作者

    A. Gross; H. F. Fasel;

  • 作者单位

    University of Arizona, Tucson, Arizona 85721;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 航空、航天;航空;
  • 关键词

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