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    (principle) Reynolds (shear) stress (tensor)

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    • P
      peiying last edited by

      基础不好的小白被这几个 stress 搞得有点stress.
      Reynolds stress, Reynolds shear stress, and stress tensor.

      原来好像知道什么是Reynolds stress, papers 里前面加个principle,中间加shear, 末尾再加tensor,就发现自己概念不清了. 符号各个paper里还不一样, 也得慢慢对照.

      还望大牛给点指点. 我继续掰书去了...

      看公式脑壳不呢么疼了,入门了?

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      • P
        peiying last edited by

        Turbulent stress 就是 Reynolds stress (Cengel, Fluid Mechanics, 第八章第五节, Turbulent flow in pipes)

        Stress Tensor 就是为了突出下是九个方向。(Credit to Yeru)

        Reynolds shear stress 有时候等同于 Reynolds stress,有时候特指 $\overline{u^{\prime} v^{\prime}}$。

        “$\rho \overline{u^{\prime} v^{\prime}}$ is Reynolds shear stress and $\rho \overline{u^{\prime} u^{\prime}}$ and $\rho \overline{v^{\prime} v^{\prime}}$ are Reynolds normal stresses,” (Choon-Sik Jhun, 2018;Reynolds Stresses,An Internet Book on Fluid Dynamics,http://brennen.caltech.edu/fluidbook/basicfluiddynamics/turbulence/reynoldsstresses.pdf
        )
        $\rho \overline{u^{\prime} v^{\prime}}=\frac{1}{N} \sum_{1}^{N} \rho(u-\bar{u})(v-\bar{v})$
        $\rho \overline{u^{\prime} u^{\prime}}=\frac{1}{N} \sum_{1}^{N} \rho(u-\bar{u})^{2}$
        $\rho \overline{v^{\prime} v^{\prime}}=\frac{1}{N} \sum_{1}^{N} \rho(v-\bar{v})^{2}$

        Principle RSS
        $R S S_{p }=\sqrt{\left(\frac{\rho \overline{u^{\prime} u^{\prime}}-\rho \overline{v^{\prime} v^{\prime}}}{2}\right)^{2}-\left(\rho \overline{u^{\prime} v^{\prime}}\right)^{2}}$
        我暂时用不着,不去想了... (Choon-Sik Jhun, 2018, Determination of Reynolds Shear Stress Level for Hemolysis)

        几乎全是摘得,要是理解有误还望指正,感谢。

        看公式脑壳不呢么疼了,入门了?

        李东岳 1 Reply Last reply Reply Quote
        • G
          gemini @peiying last edited by

          @peiying :146:

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          • 李东岳
            李东岳 管理员 @peiying last edited by

            $\tau$这个雷诺应力,对角线的是normal stress,非对角线的是shear stress。不过你说的更详细,感谢分享!

            CFD课程 改成线上了 http://dyfluid.com/class.html
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