On the Kolmogorov constant in stochastic turbulence models
On the Kolmogorov constant in stochastic turbulence models
复制标题
关于随机湍流模型中的柯尔莫哥洛夫常数
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
S. Heinz
中科院分区：
文献类型：
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作者：
S. Heinz
Kolmogorov常数是湍流随机模型的基础。为了解释观测到的这个量的变化的原因，用不同的方法和数据计算了两个流。速度波动被认为是由于各向异性，加速度波动和随机强迫，是由柯尔莫哥洛夫常数控制的贡献的总和。结果表明，各向异性和加速度波动的影响是负责显着变化的Kolmogorov常数。它被发现接近2的各向异性和加速度波动有助于能量预算的流量，和接近6，如果这种贡献消失。
The Kolmogorov constant is fundamental in stochastic models of turbulence. To explain the reasons for observed variations of this quantity, it is calculated for two flows by various methods and data. Velocity fluctuations are considered as the sum of contributions due to anisotropy, acceleration fluctuations and stochastic forcing that is controlled by the Kolmogorov constant. It is shown that the effects of anisotropy and acceleration fluctuations are responsible for significant variations of the Kolmogorov constant. It is found near 2 for flows where anisotropy and acceleration fluctuations contribute to the energy budget, and near 6 if such contributions disappear.