Comments on 'An improved free surface capturing method based on Cartesian cut cell mesh for water-entry and -exit problems'
Comments on 'An improved free surface capturing method based on Cartesian cut cell mesh for water-entry and -exit problems'
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关于“基于笛卡尔切割单元网格的改进的自由表面捕获方法，用于解决进水和出水问题”的评论
DOI：
10.1098/rspa.2011.0379
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Qian L
中科院分区：
文献类型：
--
作者：
Qian L
在题为“一种改进的自由面捕捉方法基于笛卡尔切割细胞网格的水进入和退出问题”（Proc.R.C. Soc.A465，1843-1868（doi：10.1098/rspa.2008.0410）），本作者的早期工作（，Proc. R. Soc.A462，21-42（doi：10.1098/rspa.2005.1528））已经被具体应用于固体物体的入水和出水的研究。一个扩展的边界条件，保留由于在动量方程中的移动边界的加速度项，已被用于计算在固体表面的压力梯度，并根据他们的数值实验，它是由王和王得出的结论，没有这个术语的计算将大大低于预测的冲击力，甚至可能会崩溃。因此，一个更复杂的程序的基础上的精确解的黎曼问题的移动边界的实施。本文将作者的自由面捕捉程序应用于同一个楔形体入水问题，结果表明，采用新的压力边界条件与不加加速度项的原边界条件的结果几乎相同，表明它对模拟结果的影响很小。对压力边界条件的实施细节的进一步检查也支持这一结论。
In the paper entitled ‘An improved free surface capturing method based on Cartesian cut cell mesh for water-entry and -exit problems’ (Proc. R. Soc. A465, 1843–1868 (doi:10.1098/rspa.2008.0410)), the present authors' earlier work (,Proc. R. Soc. A462, 21–42 (doi:10.1098/rspa.2005.1528)) has been specifically applied to the study of water-entry and -exit of solid objects. An extended boundary condition, retaining the term owing to acceleration of moving boundaries in the momentum equation, has been implemented for calculating the pressure gradient at solid surfaces and, based on their numerical experiments, it was concluded by Wang and Wang that without this term the calculation will substantially under-predict the impact forces and may even break down. Therefore, a more complex procedure based on the exact solution of a Riemann problem for moving boundaries was implemented. In this short comment, by applying the authors' free surface capturing code to the same flow problem of water-entry of a wedge, it can, however, be demonstrated that the results from implementing the new pressure boundary condition are nearly identical to that of employing the original boundary condition without the acceleration term, indicating that its effects on the simulation results are minimal. A further examination of the implementation details on the pressure boundary condition also supports this conclusion.