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首页> 外文期刊>Applied Mathematical Modelling >A near-wall domain decomposition approach in application to turbulent flow in a diffuser
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A near-wall domain decomposition approach in application to turbulent flow in a diffuser

机译：近壁域分解方法在扩散器湍流中的应用

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摘要

Turbulent flow in an asymmetric, two-dimensional diffuser is studied using a near-wall domain decomposition method and a k-ε turbulence model. A one-dimensional boundary layer equation is used to transfer the boundary conditions from the wall to an interface within the flow. The boundary conditions applied to the fluid velocity and turbulent kinetic energy are of Robin type. They are mesh independent and can account for arbitrary source terms. This approach avoids the computational expense of fully simulating the turbulent boundary layers. For the first time, the technique has been applied to modelling a separated flow with an unstructured code. It is shown how the interface boundary condition on the turbulent kinetic energy allows the recirculation region in the diffuser to be captured. In contrast, the standard wall function approach, based on the log law, fails to predict any recirculation region. The only parameter required to apply the domain decomposition method is a turbulent viscosity profile across the boundary layer. Three different profiles are used in this work. It is shown how making the turbulent viscosity a function of the pressure gradient improves flow predictions for the diffuser. The results demonstrate that the method is an efficient way to simulate the boundary layers in engineering problems that include complex geometries or separating flows.
机译：使用近壁区域分解方法和k-ε湍流模型研究了非对称二维扩散器中的湍流。一维边界层方程用于将边界条件从壁传递到流内的界面。应用于流体速度和湍动能的边界条件是罗宾型的。它们是独立于网格的，可以解释任意源项。这种方法避免了完全模拟湍流边界层的计算费用。第一次，该技术已被应用到具有非结构化代码的分离流建模中。示出了在湍动能上的界面边界条件如何允许扩散器中的再循环区域被捕获。相反，基于对数定律的标准墙函数方法无法预测任何再循环区域。应用区域分解方法所需的唯一参数是边界层上的湍流粘度曲线。在这项工作中使用了三种不同的配置文件。示出了如何使湍流粘度作为压力梯度的函数来改善扩散器的流量预测。结果表明，该方法是一种模拟复杂几何形状或分离流的工程问题中边界层的有效方法。

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