Effect of gradient production on scalar fluctuations in decaying grid turbulence.
Effect of gradient production on scalar fluctuations in decaying grid turbulence.
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梯度产生对衰减网格湍流中标量波动的影响。
DOI：
10.1103/physreve.64.016316
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
L. Mydlarski
中科院分区：
文献类型：
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作者：
L. Danaila;L. Mydlarski
本文导出了一个广义的Yaglom方程，其中考虑了湍流产生温度涨落的影响。将修正的Yaglom方程（它扩展了Danaila等人的工作[J.Fluid Mech.391，359（1999）]，以纳入衰变和产生的影响）与实验数据进行比较。所考虑的流动是具有强加的平均温度梯度的衰减网格湍流（Mydlarski和Warhaft [J.Fluid Mech.358，135（1998）]）。理论和实验之间的协议是好的，在流动中的非均匀性的影响是小的。
A generalized form of Yaglom's equation, in which the effect of turbulent production of temperature fluctuations is taken into account, is derived. The modified Yaglom equation (which extends the work of Danaila et al. [J. Fluid Mech. 391, 359 (1999)] to incorporate the effects of decay and production) is compared with experimental data. The flow under consideration is decaying grid turbulence with an imposed mean temperature gradient (Mydlarski and Warhaft [J. Fluid Mech. 358, 135 (1998)]). The agreement between theory and experiment is good and the effects of nonhomogeneities in the flow are small.