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CFD中文网

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  3. CFDEM 非牛顿流

CFDEM 非牛顿流

Scheduled Pinned Locked Moved OpenFOAM
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  • J Offline
    J Offline
    Jacob Z
    wrote on last edited by
    #1

    大家好,我最近使用CFDEM模拟非牛顿流体、颗粒两相流。粘度模型为powerLaw。参数:nuMax=0.0005(m^2/s); nuMin=0.00005(m^2/s); k=1.2; n=0.525。按理说这个粘度比水大,为什么同样的模型计算结果显示颗粒的沉降速度在水中反而更慢呢?而且是慢很多:135:

    1 Reply Last reply
  • bestucanB Offline
    bestucanB Offline
    bestucan 版主 大神
    wrote on last edited by
    #2

    加大参数再看,看加大参数有效果没。如果有效果,说明是计算过程有问题;如果没效果,说明算都没算,估计直接是0。

    滚来滚去……~(~o ̄▽ ̄)~o 滚来滚去都不能让大家看出来我不是老师么 O_o

    异步沟通方式(《posting style》from wiki)(下载后打开):
    https://www.jianguoyun.com/p/Dc52X2sQsLv2BRiqnKYD
    提问的智慧(github在gitee的镜像):
    https://gitee.com/bestucan/How-To-Ask-Questions-The-Smart-Way

    J 1 Reply Last reply
  • J Offline
    J Offline
    Jacob Z
    replied to bestucan on last edited by
    #3

    @bestucan 感谢大佬。已尝试增大粘度,结果还是错的。但是当粘度接近水的粘度(1e-6)甚至更小时就正常了。没搞懂是什么原因:136:

    1 Reply Last reply
  • 李东岳李 Online
    李东岳李 Online
    李东岳 管理员
    wrote on last edited by
    #4

    界面类大密度比的时候算法会存在一些缺陷。跟你描述的差不多。但你这个欧拉拉格朗日应该不至于。我建议你模拟单个用欧拉拉格朗日模拟一个粒子,看下结果。

    9月CFD算法编程课: http://dyfluid.com/class.html

    需要帮助debug算例的看这个 https://cfd-china.com/topic/8018

    1 Reply Last reply
  • A Offline
    A Offline
    asininno
    wrote on last edited by
    #5

    非牛顿流体力拖曳力的计算应该不一样,不知道你用的哪个方法计算,如果直接套用牛顿流体的模型会导致拖曳力计算偏小吧

    J 1 Reply Last reply
  • J Offline
    J Offline
    Jacob Z
    replied to asininno on last edited by
    #6

    @asininno 不好意思忘了回复。感谢指点,的确是曳力模型的问题:xiexie:

    L 1 Reply Last reply
  • J Offline
    J Offline
    Jacob Z
    wrote on last edited by
    #7

    @李东岳 很抱歉忘了回复。。。感谢李老师指点,是我参数设置有问题。李老师新年快乐哈!:xiexie:

    1 Reply Last reply
  • L Offline
    L Offline
    lys
    replied to Jacob Z on last edited by
    #8

    @Jacob-Z 请问非牛的曳力模型是of中已经有的吗?还是需要自己重新编译非牛的曳力模型

    J 1 Reply Last reply
  • J Offline
    J Offline
    Jacob Z
    replied to lys on last edited by
    #9

    @lys 用的已有模型,专门针对非牛顿流体的曳力模型还没用过,希望能进一步交流啊

    1 Reply Last reply

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