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The experimental data indicate a Rλ0.5 dependence for the kurtosis of the temperature derivative and a Rλ0.15 variation for the strain rate-scalar dissipation correlation.
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| | Previous investigators′ study indicates that the turbulent dissipation correlation and the turbulent dissipation rate are composed of an inhomogeneous part and a homogeneous part.On the basis of this result,the homogeneous part is further composed of a main part—isotropic part and a residual part. The residual part is negligible in the turbulence model.Further more,the relation among the isotropic part ε h,fluctuating energy k and transverse differential length scale λ g is established.... | | 在前人研究的成果———将耗散相关εij 和能耗率ε分解为非均匀部分和均匀部分———的基础上,进一步将均匀部分分解为主要部分即各向同性部分和剩余部分.分析了各向同性部分εh 与脉动能k 、横向微比尺λg 的关系,指出εh 随着脉动能k 的取值,落在阻力平方区、过渡区和阻力线性区等范围,提出了可以代替紊流模式中并不精确的能耗率简化方程的算式. | | 文摘来源 | |   |
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