Scaling of the velocity power spectra in turbulent thermal convection.
Scaling of the velocity power spectra in turbulent thermal convection.
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DOI：
10.1103/physreve.64.065301
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发表时间：
2001-11
期刊：
影响因子：
--
通讯作者：
X. Shang;K. Xia
中科院分区：
文献类型：
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作者：
X. Shang;K. Xia
我们报告测量的局部速度充满水的对流单体。在浮力子区（Bolgiano尺度f（B）和积分尺度f（o）之间的尺度），发现了两个由耗散谱的峰值频率f（p）分隔的速度频率功率谱标度区，当f（p）<f<f（B）时，我们观察到Bolgiano-Obukhov标度指数为-11/5的幂律.对于f（o）<f<f（p），观察到具有指数-1.35的意外缩放。我们还发现，速度功率谱是关于特征尺度f（p）的普适函数。和f（B）。
We report measurements of the local velocity in a convection cell filled with water. In the buoyancy subrange (the scales between the Bolgiano scale f(B) and the integral scale f(o)), two scaling regions of the velocity frequency power spectra, separated by the peak frequency f(p) of the dissipation spectra, are found. For f(p)<f<f(B), we observe a power law with the Bolgiano-Obukhov scaling exponent -11/5. For f(o)<f<f(p), an unexpected scaling with an exponent -1.35 is observed. We also found that the velocity power spectra are universal functions with respect to the characteristic scales f(p). and f(B).