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arXiv 1208.4541physics.flu-dyn
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可压缩壁面约束turbulence的一般雷诺相似理论

A general Reynolds analogy theory for the compressible wall-bounded turbulence

You-sheng Zhang, Wei-tao Bi, Fazle. Husain, Xin-liang Li, Zhen-su She

摘要:

本文提出了一种适用于可压缩壁面湍流中平均速度和温度及脉动速度和温度的广义雷诺相似理论。特别地,导出了可压缩湍流管道和槽道流动的精确模拟解和可压缩湍流边界层(CTBL)的近似模拟解,两者都与流体Prandtl数和壁温条件无关。类比解与直接数值模拟数据非常吻合,能够再现经验关系,可以看作是现有理论的扩展。与Walz的绝热CTBL方程不同,GRA导出的平均温度-速度关系可以适用于非绝热壁面条件下的不同壁面有界流动,这是通过将Walz的绝热恢复因子扩展为与热流密度相关的恢复因子来实现的。由GRA导出的脉动温度-速度关系与由Huang等人唯象导出的修正强Reynolds类比(HSRA)略有不同,但比HSRA具有更好的性能。此外,在GRA中引入了几个关键量,包括一般的总焓(或温度)和绝热度-一个有充分根据的无量纲参数,用于表征非绝热流动中的壁温效应。GRA揭示了温度场和速度场之间复杂的非线性耦合背后的普遍特征,并使得利用相应不可压流动的信息来预测可压缩壁面湍流的平均场成为可能。

英文摘要:

A general Reynolds analogy (GRA) theory is proposed for the mean and fluctuating velocity and temperature in compressible wall-bounded turbulent flows. In particular, an exact analogy solution is derived for compressible turbulent pipe and channel flows and an approximate analogy solution is derived for compressible turbulent boundary layers (CTBL), both of which are independent of fluid Prandtl number and wall temperature condition. The analogy solutions are in excellent agreement with direct numerical simulation data, able to reproduce empirical relations, and can be viewed as extensions of existing theories. In contrast to Walz's equation for adiabatic CTBL, the mean temperature-velocity relation derived by GRA can be applied to different wall-bounded flows in non-adiabatic wall condition, which is achieved by extending Walz's adiabatic recovery factor to a heat flux dependent one. The fluctuation temperature-velocity relations derived by GRA are slightly different from the modified strong Reynolds analogy derived phenomenologically by Huang et al. (HSRA), and have a better performance than HSRA. In addition, several key quantities are introduced in GRA, including a general total enthalpy (or temperature) and an adiabatic degree--a well-founded dimensionless parameter for characterizing the wall-temperature effects in non-adiabatic flows. The GRA unveils the universal feature behind the complex nonlinear couplings between the thermal and velocity fields, and makes possible of predicting the mean fields of compressible wall-bounded turbulence with the information of the corresponding incompressible flow.

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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