A new scheme for identifying free surface particles in improved SPH

• Published in: Science China. Physics, mechanics & astronomy Vol. 55; no. 8; pp. 1454 - 1463
• Main Authors: Zheng, Xing, Duan, WenYang, Ma, QingWei
• Format: Journal Article
• Language: English
• Published: Heidelberg SP Science China Press 01.08.2012; Springer Nature B.V
• Subjects: Astronomy; Classical and Continuum Physics; Compressibility; Density ratio; Flow simulation; Free surfaces; Hydrodynamics; Observations and Techniques; Physics; Physics and Astronomy; Smooth particle hydrodynamics; SPH; Surface flow; U-Pb年龄; Water waves; 弱可压缩; 数值试验; 模拟过程; 流体动力学; 自由表面流动; 表面颗粒; SPH; free surface identification scheme; meshfree method; improved SPH
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-012-4809-3

The present paper proposes a new scheme for identifying free surface particles in an improved SPH （Smoothed Particle Hydrodynamics）, With the development of the SPH, free surface identification becomes a key challenge in free surface flow sim- ulations, especially for violent breaking water waves. According to numerical tests, existing free surface identified schemes are not reliable for weakly compressible SPH when violent waves are modeled. The new free surface identification scheme sug- gested here considers changes in density ratio and three auxiliary functions. Although this new scheme originates from a scheme for another meshfree method （MLPG_R method）, it includes several improvements, especially developed for the im- proved SPH. The limited numerical tests have indicated that the scheme does not significantly increase CPU time required, but it considerably improves the identification of free surface particles.