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  3. 压力显示成台阶状的分布疑惑

压力显示成台阶状的分布疑惑

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

    先前有研究竖直圆管的摩擦压降分析。我画出了圆管的轴向中心沿线分布,查看了压力场,发现整体趋势是笔直的,但局部却是成台阶状的分布
    49c8dcae-5c80-40ff-8216-4a7613e8d2ee-图片.png
    按理说不会出现这种情况吧。压力突然垂直向下,那不是压力梯度无穷大了吗?但是计算过程仍感觉没有问题,没报错。
    不知道是什么引起的这种现象?

    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 李东岳
    #2

    另外,我不清楚你这个画的是什么,只有一个类似的阶梯状的图。类似这个图我在今年8月份复现过,不过不是你这个算力,很多高阶格式都会把smooth的型线压缩成square的,例如Superbee,即使Minmod也有这种情况存在。

    Figure 6.2(b) shows the same test problem as before but with the superbee method. The discontinuity stays considerably sharper.On the other hand, we see a tendency of the smoothhump to become steeper and squared off. This is sometimes a problem with superbee – by choosing the larger of the neighboring slopes it tends to steepen smooth transitions near inflection points.

    Leveque 2002 p. 112

    不过,我觉得你的问题可能不是这个...只不过图跟我遇到的有点像,给你点启发

    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

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