论文标题
Lagrangian自由流边界条件，用于弱化平滑颗粒流体动力学
A Lagrangian free-stream boundary condition for weakly compressible smoothed particle hydrodynamics
论文作者
论文摘要
本文提出了在纯粹可压缩平滑粒子流体动力学（WCSPH）的纯粹拉格朗日框架中的第一个自由流边界条件。边界条件是基于几种数值技术来实现的，包括时空方法以及确保表面颗粒识别的技术，在自由流边界附近的密度和速度的远场校正以及改善的内在和出口条件，这些条件可确保平稳的流入型分以及没有截见的核心问题的流出颗粒。该方法的准确性和有效性已通过平板和圆形圆柱体的参考溶液进行了验证。该方法还通过更复杂的流进行了测试以证明其适用性，例如流体结构相互作用（FSI）和3D流过一个球体。
This paper proposes the first free-stream boundary condition in a purely Lagrangian framework for weakly-compressible smoothed particle hydrodynamics (WCSPH). The boundary condition is implemented based on several numerical techniques, including a spatio-temporal method and an ensuring technique for surface particle identification, far-field corrections of density and velocity near the free-stream boundary, and improved in- and outlet conditions which guarantee smooth inflow profile and free outflow particles without the issue of the truncated kernel. The accuracy and effectiveness of the method have been validated by the reference solutions of flow past a flat plate and circular cylinder, respectively. The method has also been tested with more complex flows to demonstrate its applicability, such as fluid-structure interaction (FSI) and 3D flow past a sphere.
