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  3. 湍动能和Reynolds shear stress如何求

湍动能和Reynolds shear stress如何求

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  • C Offline
    C Offline
    Calf.Z-DNS
    wrote on last edited by
    #1

    圆管DNS后处理中需要分析湍动能TKE和Reynolds shear stress(RSS),表达式分别如下:
    001e792b-9d9f-483e-902d-6a6bddcd9898-图片.png
    abd669be-7e9a-4762-ae22-7fc351fb5d21-图片.png
    其中Ui是圆柱坐标下三个方向上的速度。ui''表示Favre平均下的速度脉动。Favre平均就是:
    4bbaa074-67ab-4338-8140-36eb64e1a3e0-图片.png c5870088-f2ca-4af5-a089-bf06b39ee559-图片.png
    那么我想请教下我这么推导是正确的吗?
    3025df52-6597-4b5b-bb4f-974bdacec602-图片.png

    或者说通过其他量就能计算得到TKE和RSS? 我试过Uprime2Meanxx来表示u''u'',画出来的趋势差不多。但不知道对不对。

    另外我想了解圆柱坐标下的径向速度Ur如何得到呢,通过根号(UxUx+UyUy)吗?

    以上问题还望解答,谢谢!

    P 1 Reply Last reply
  • C Offline
    C Offline
    Calf.Z-DNS
    wrote on last edited by
    #2

    请问有人能帮忙解答这个问题吗?

    1 Reply Last reply
  • 霜 Offline
    霜 Offline
    霜染丹枫
    wrote on last edited by
    #3

    你好,本人是在校生,也是做超临界流体(煤油)数值计算方向,方便的话,可以一起交流一下么?本人qq:1191364394。希望可以一起学习,握手。

    1 Reply Last reply
  • P Offline
    P Offline
    peiying
    replied to Calf.Z-DNS on last edited by
    #4

    @calf-z-dns 你解决了吗?

    我也在查 Reynolds Shear Stress, 和 Reynolds stress 有点分不太清楚.
    http://brennen.caltech.edu/fluidbook/basicfluiddynamics/turbulence/reynoldsstresses.pdf (http://brennen.caltech.edu/fluidbook 公式的索引)
    这篇上还有个 Reynolds normal stress ...

    看公式脑壳不呢么疼了,入门了?

    1 Reply Last reply

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