Wave body interaction in 2D using smoothed particle hydrodynamics (SPH) with variable particle mass
Wave body interaction in 2D using smoothed particle hydrodynamics (SPH) with variable particle mass
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DOI：
10.1002/fld.2528
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发表时间：
2012-02
影响因子：
1.8
通讯作者：
P. Omidvar;P. Stansby;B. Rogers
中科院分区：
文献类型：
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作者：
P. Omidvar;P. Stansby;B. Rogers
波浪与物体的相互作用是光滑粒子流体动力学（SPH）的一个重要实际应用，SPH原则上适用于陡波和破碎波，无需特殊处理。然而，很少有详细的测试已经进行，即使是小振幅波。为了减少计算机时间的可变粒子质量分布测试在这里与身体附近的精细分辨率和粗分辨率进一步远离，同时保持一个统一的内核大小。我们考虑两个定义良好的测试情况下，在两个维度上，由起伏的半浸没圆柱体产生的波浪和前进波与固定圆柱体相互作用。但首先，静水与静水压力进行测试。开源代码SPHysics（http：www.sphysics.org）§首次在线发布后在此处进行更新。在任意拉格朗日-欧拉公式中与黎曼解算器一起使用。对于垂荡圆柱，SPH的远场波幅和圆柱力的结果与Yu和Ursell（J. Fluid Mech.1961; 11：529-551）的数据显示出良好的一致性。对于半淹没圆柱体上的波浪载荷，与狄克逊等人的实验数据一致。1979; 105：421-438），均方根力在2%以内。对于更多的淹没情况下，结果显示出一些差异，但这也被发现与其他建模方法。结果对基于MUSCL的黎曼解算器中使用的斜率限制器的值的敏感性得到了证明。在这些情况下，可变质量分布导致计算机运行加速接近200%。版权所有© 2011约翰威利父子有限公司.
Wave interaction with bodies is an important practical application for smoothed particle hydrodynamics (SPH) which in principle applies to steep and breaking waves without special treatment. However, few detailed tests have been undertaken even with small amplitude waves. In order to reduce computer time a variable particle mass distribution is tested here with fine resolution near the body and coarse resolution further away, while maintaining a uniform kernel size. We consider two well‐defined test cases, in two dimensions, of waves generated by a heaving semi‐immersed cylinder and progressive waves interacting with a fixed cylinder. But first, still water with hydrostatic pressure is tested. The open‐source code SPHysics (http://www.sphysics.org)§Update made here after initial online publication. is used with a Riemann solver in an Arbitrary Lagrangian–Eulerian formulation. For the heaving cylinder, SPH results for far field wave amplitude and cylinder force show good agreement with the data of Yu and Ursell (J. Fluid Mech. 1961; 11:529–551). For wave loading on a half‐submerged cylinder the agreement with the experimental data of Dixon et al. (J. Waterway Port Coastal Ocean Div. 1979; 105:421–438) for the root mean square force is within 2%. For more submerged cases, the results show some discrepancy, but this was also found with other modelling approaches. The sensitivity of results to the value of the slope limiter used in the MUSCL‐based Riemann solver is demonstrated. The variable mass distribution leads to a computer run speedup of nearly 200% in these cases. Copyright © 2011 John Wiley & Sons, Ltd.