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arXiv 1906.05500physics.flu-dyn
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关于声学turbulence的一点注记

A note on acoustic turbulence

Erik Lindborg

摘要:

我们考虑一个理想气体的三维声场,其中所有的熵产生被限制在弱激波,并表明类似的标度关系适用于这样一个领域的强迫Burgers湍流,其中的冲击振幅的尺度为$ (εd)^{1/3} $和$ p $:第阶结构函数的尺度为$ (εd)^{p/3} r/d$,$ ε$是每单位质量的平均能量耗散,$ d $的平均距离之间的冲击和$ r $的分离距离。然而,对于声场,$ ε$应该由$ ε+ χ$代替,其中$ χ$与由于热传导引起的熵产生相关联。特别地,三阶纵向结构函数按比例缩放为$ \langle δu_r^3 \rangle = -C(ε+ χ) r $,其中$ C $取弱冲击极限中的值$ 12/5(γ+1) $,$ γ= c_p/c_v$是恒定压力和恒定体积下的比热之间的比率。

英文摘要:

We consider a three-dimensional acoustic field of an ideal gas in which all entropy production is confined to weak shocks and show that similar scaling relations hold for such a field as for forced Burgers turbulence, where the shock amplitude scales as $ (εd)^{1/3} $ and the $ p $:th order structure function scales as $ (εd)^{p/3} r/d$, $ ε$ being the mean energy dissipation per unit mass, $ d $ the mean distance between the shocks and $ r $ the separation distance. However, for the acoustic field $ ε$ should be replaced by $ ε+ χ$, where $ χ$ is associated with entropy production due to heat conduction. In particular, the third order longitudinal structure function scales as $ \langle δu_r^3 \rangle = -C(ε+ χ) r $, where $ C $ takes the value $ 12/5(γ+1) $ in the weak shock limit, $ γ= c_p/c_v$ being the ratio between the specific heats at constant pressure and constant volume.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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