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首页> 外文期刊>International Journal of Heat and Mass Transfer >Large-eddy simulation for turbulent flow and gas dispersion over wavy walls
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Large-eddy simulation for turbulent flow and gas dispersion over wavy walls

机译：大涡模拟波浪壁上的湍流和气体扩散

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摘要

Large-eddy simulation is implemented for turbulent flow and gas dispersion over wavy walls across a wide range of the wave amplitude to wavelength ratio (α = 1.0, 1.5, and 2.0). Two tracer gases are emitted from point sources located at a single crest and trough of the wavy wall. Because the values ofαincrease under the Reynolds number based on the bulk velocity and the wavelength is6.67×104, the flow separates behind the crest and the standard deviations of the fluctuation in streamwise and spanwise velocity components become relatively large especially at the upslope of the wavy wall. The increase are related to the vortices linked to the Görtler instability mechanism. The change in the flow pattern with respect to the value ofαsignificantly affects the gas dispersion within the valley. As the Reynolds number increases under the wavy wall withα = 2.0, the flow tends to follow the bottom surface of the wavy wall and the number of the vortices increases at the upslope, but the vortices do not significantly affect the gas dispersion over the wavy wall.
机译：大涡流模拟是在波振幅和波长比（α= 1.0、1.5和2.0）的宽范围内对波状壁上的湍流和气体扩散进行的。从位于波浪壁的单个波峰和波谷处的点源发出两种示踪气体。由于基于体速和波长的雷诺数下的α值增加，为6.67×104，因此气流在波峰后分离，并且在流速和展向速度分量波动的标准偏差变得相对较大，特别是在波峰向上。波浪墙。这种增加与与格尔特勒不稳定机制有关的涡旋有关。流动模式相对于α值的变化会显着影响谷底内的气体扩散。随着波浪壁下雷诺数的增加（α= 2.0），流动趋于跟随波浪壁的底面，并且涡流的数量在上坡处增加，但涡流不会显着影响波浪壁上的气体扩散。

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