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CFD中文网

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  3. 请教各位大神,6dof动网格,被动运动,运动无法趋于平稳怎么回事

请教各位大神,6dof动网格,被动运动,运动无法趋于平稳怎么回事

Scheduled Pinned Locked Moved Fluent
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  • Y Offline
    Y Offline
    ykk
    wrote on last edited by
    #1

    c540cb25-703b-4d99-ac62-8f9f037eb5bb-image.png

    C 1 Reply Last reply
  • G Offline
    G Offline
    gemini
    wrote on last edited by
    #2

    信息有点少啊..

    Y 1 Reply Last reply
  • C Offline
    C Offline
    cccrrryyy 超神
    replied to ykk on last edited by
    #3

    @ykk 为什么“在粘性阻力作用下,摆动角度先大后小趋于平稳才是”?

    I don't want to survive, I want to thrive.

    Y 1 Reply Last reply
  • Y Offline
    Y Offline
    ykk
    replied to cccrrryyy on last edited by
    #4

    @cccrrryyy 想像的是这样的:开始的时候球体在浮力的作用下,处于竖直向上的稳定状态,来流后球体会产生摆动,此时的摆动可能由于惯性的原因幅度会特别大,一段时间后会稳定于只有涡激振动引起的摆动。想像的是这样的,不知道6dof这种方法是否合适。(最终目的就是得到单铰球在涡激作用下的摆动振幅)

    C 1 Reply Last reply
  • Y Offline
    Y Offline
    ykk
    replied to gemini on last edited by
    #5

    @gemini 我的目的是想研究下:单铰球在涡激振动下的摆动频率/振幅。但是目前用6dof这种方法,一直无法稳定,摆动的幅度越来越大。

    1 Reply Last reply
  • 梧 Offline
    梧 Offline
    梧桐
    wrote on last edited by
    #6

    首先,看看流场是否合理。再积分下球受到的作用力是否合理? 如果都合理,会不会是共振了?

    1 Reply Last reply
  • C Offline
    C Offline
    cccrrryyy 超神
    replied to ykk on last edited by
    #7

    @ykk 方法自然是合适的,但是你需要确定你算的是对的,边界条件、数值格式啥的,而且瞬态模拟时间步长也需要关注。

    我比较好奇的是你是做了这种工况下的实验观测到了运动趋于平稳吗,有没有可能它就是不平稳呢?

    I don't want to survive, I want to thrive.

    1 Reply Last reply

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