Boundary conditions generated by dynamic particles in SPH methods
Boundary conditions generated by dynamic particles in SPH methods
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DOI：
10.3970/cmc.2007.005.173
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发表时间：
2007-06
影响因子：
3.1
通讯作者：
A. Crespo;M. Gómez-Gesteira;R. Dalrymple
中科院分区：
文献类型：
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作者：
A. Crespo;M. Gómez-Gesteira;R. Dalrymple
光滑粒子流体动力学是一种纯粹的拉格朗日方法，可以应用于各种领域。本文介绍了动态边界粒子（DBPs）的产生及其性质。这些边界粒子与置于域内的运动粒子共享相同的连续性方程和状态方程，尽管它们的位置和速度在时间上保持不变或由外部规定。对运动粒子与边界粒子的碰撞进行了理论和数值计算。在没有粘性的情况下，观察到边界以弹性方式表现。它们允许流体粒子接近，直到临界距离，这取决于入射粒子的能量。此外，一个溃坝被限制在一个盒子里，用来检查的方法的有效性。实验结果与数值计算结果吻合较好，表明了DBPs的可靠性。关键词：无网格方法，SPH，光滑粒子流体动力学，边界条件
Smoothed Particle Hydrodynamics is a purely Lagrangian method that can be applied to a wide variety of fields. The foundation and properties of the so called dynamic boundary particles (DBPs) are described in this paper. These boundary particles share the same equations of continuity and state as the moving particles placed inside the domain, although their positions and velocities remain unaltered in time or are externally prescribed. Theoretical and numerical calculations were carried out to study the collision between a moving particle and a boundary particle. The boundaries were observed to behave in an elastic manner in absence of viscosity. They allow the fluid particles to approach till a critical distance depending on the energy of the incident particle. In addition, a dam break confined in a box was used to check the validity of the approach. The good agreement between experiments and numerical results shows the reliability of DBPs. Keyword: Meshfree methods, SPH, smoothed particle hydrodynamics, boundary conditions