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首页> 外文期刊>Ocean Dynamics >Flow over a rounded backward-facing step, using a z-coordinate model and a a-coordinate model
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Flow over a rounded backward-facing step, using a z-coordinate model and a a-coordinate model

机译：使用z坐标模型和a坐标模型进行倒圆的向后步骤

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摘要

Homogeneous, nonrotating flow over a backward-facing rounded step is simulated using the 2D vertical version of two general circulation models, a z-coordinate model—the Massachusetts Institute of Technology general circulation model (MITgcm)— and a a -coordinate model—the Bergen Ocean Model (BOM). The backward-facing step is a well-known test-case since it is geometrically simple but still embodies important flow characteristics such as separation point, reattachment length, and recirculation of the flow. The study compares the core of the two models and uses constant eddy viscosities and diffusivities. The Reynolds numbers ranges from 2102 to 2-106. The results correspond with previously published results having a relatively stationary separation point and a fluctuating reattachment length due to downslope propagating eddies released from the reattachment zone for Reynolds numbers higher than or equal to 2 • 104. For Reynolds number within the laminar regime, the flow is stationary. The discrepancies between the models increase by enhancing Reynolds numbers. The a -coordinate model experiences a reduction in eddy sizes with increasing resolution and Reynolds numbers in correspondence with published experiments, while the size of the eddies are independent of the Reynolds number using the MITgcm. Due to mixing generated by the staircase topography, the z-coordinate model gives a better convergence of the separation point and reattachment length compared with the BOM; however, this conclusion might change with the inclusion of a relevant turbulence scheme.
机译：使用两个常规循环模型的二维垂直版本，即z坐标模型（麻省理工学院常规循环模型（MITgcm））和aa坐标模型（卑尔根），模拟了朝后的圆形步骤的均质非旋转流动海洋模型（BOM）。面向后的步骤是众所周知的测试用例，因为它在几何上很简单，但仍体现了重要的流动特性，例如分离点，重新连接长度和流动再循环。该研究比较了两个模型的核心，并使用了恒定的涡流粘度和扩散率。雷诺数范围从2102到2-106。该结果与先前发表的结果相对应，该结果具有相对固定的分离点，并且由于雷诺数大于或等于2•104的从重新附着区释放的下坡传播涡流而导致重新附着长度波动。对于层流状态下的雷诺数，流动是固定的。通过增加雷诺数，模型之间的差异会增加。与已发表的实验相对应，a坐标模型的涡旋尺寸随着分辨率和雷诺数的增加而减小，而涡旋的尺寸与使用MITgcm的雷诺数无关。由于阶梯形地形产生的混合，与BOM相比，z坐标模型可以更好地收敛分离点和重新连接长度。然而，随着相关湍流方案的加入，这一结论可能会改变。

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  • 来源
    《Ocean Dynamics》 |2011年第10期|p.1681-1696|共16页
  • 作者

    K. Rygg; G. Alendal; G. Alendal; P. M. Haugan;

  • 作者单位

    UniComputing, H0yteknologisenteret, Thorm0hlensgate 55, 5008 Bergen, Norway;

    UniComputing, H0yteknologisenteret, Thorm0hlensgate 55, 5008 Bergen, Norway;

    Department of Mathematics, University of Bergen,Johannes Brunsgate 12,5008 Bergen, Norway;

    Geophysical Institute, University of Bergen,Allegaten 70, 5007 Bergen, Norway;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    backward-facing step; separation; reattachment; mitgcm; bom;

    机译：向后的步骤;分离重新连接;mitgcm;宝;

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