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arXiv 1810.06010physics.comp-ph
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固体中的双支撑光滑粒子流体动力学:变分原理与隐式公式

Dual-support smoothed particle hydrodynamics in solid: variational principle and implicit formulation

Huilong Ren, Xiaoying Zhuang, Timon Rabczuk, Hehua Zhu

AI总结:

本文在变分原理下推导固体DS-SPH,提出沙漏能量泛函,获得切线刚度矩阵,实现隐式SPH,并通过数值算例验证。

摘要:

本文在变分原理框架下推导了固体中的双支撑光滑粒子流体动力学(DS-SPH)。SPH的切线刚度矩阵易于获得,可作为隐式SPH的基础。我们提出了一个沙漏能量泛函,可直接推导沙漏力和沙漏切线刚度矩阵。基于变分原理的所有推导中均识别出双支撑,并在刚度矩阵组装中自动满足。刚度矩阵的实现包括两步:基于变形梯度的节点组装和全局组装。给出了几个数值算例来验证该方法。

英文摘要:

In this paper, we derive the dual-support smoothed particle hydrodynamics (DS-SPH) in solid in the framework of variational principle. The tangent stiffness matrix of SPH is obtained with ease, which can be served as the basis for implicit SPH. We propose a hourglass energy functional, which allows the direct derivation of hourglass force and hourglass tangent stiffness matrix. The dual-support is identified in all derivation based on variational principles and is automatically satisfied in the assembling of stiffness matrix. The implementation of stiffness matrix comprises with two steps, the nodal assembly based on deformation gradient and global assembly. Several numerical examples are presented to validate the method.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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