Comparative study of different SPH schemes on simulating violent water wave impact flows
Comparative study of different SPH schemes on simulating violent water wave impact flows
复制标题
DOI：
10.1007/s13344-014-0061-0
复制
发表时间：
2014-12
影响因子：
1.6
通讯作者：
Xing Zheng;Qing-wei Ma;W. Duan
中科院分区：
文献类型：
--
作者：
Xing Zheng;Qing-wei Ma;W. Duan
自由表面流动是计算流体动力学（CFD）研究的重要内容。然而，剧烈的水波冲击模拟，特别是当自由面破碎或冲击固体壁时，对许多CFD技术来说是一个很大的挑战。光滑粒子流体动力学（SPH）是一种模拟剧烈自由表面流动的可靠方法。弱可压缩SPH（Weakly Compressable SPH，WCSPH）采用大声速的状态方程，其计算结果在模拟波浪冲击问题时会产生噪声压力场和虚假的压力时程振荡。作为一种补救措施，引入了真正不可压缩SPH（ISPH）技术，该技术使用压力泊松方程来计算压力。虽然ISPH得到的压力分布在整个领域是光滑的，技术的稳定性仍然是一个开放的讨论。本文介绍了一种新的自由面识别方案和固体边界处理方法，以提高ISPH的精度。将该模型应用于溃坝流和液舱剧烈晃动流的研究。通过对WCSPH和ISPH的对比研究，对WCSPH的精度和效率进行了评估，并将计算结果与实验数据进行了比较。
Free surface flows are of significant interest in Computational Fluid Dynamics (CFD). However, violent water wave impact simulation especially when free surface breaks or impacts on solid wall can be a big challenge for many CFD techniques. Smoothed Particle Hydrodynamics (SPH) has been reported as a robust and reliable method for simulating violent free surface flows. Weakly compressible SPH (WCSPH) uses an equation of state with a large sound speed, and the results of the WCSPH can induce a noisy pressure field and spurious oscillation of pressure in time history for wave impact problem simulation. As a remedy, the truly incompressible SPH (ISPH) technique was introduced, which uses a pressure Poisson equation to calculate the pressure. Although the pressure distribution in the whole field obtained by ISPH is smooth, the stability of the techniques is still an open discussion. In this paper, a new free surface identification scheme and solid boundary handling method are introduced to improve the accuracy of ISPH. This modified ISPH is used to study dam breaking flow and violent tank sloshing flows. On the comparative study of WCSPH and ISPH, the accuracy and efficiency are assessed and the results are compared with the experimental data.