Special Issue on ICCM2015; Guest Editor: Moubin LiuNo Access

Numerical Simulation of Violent Impinging Jet Flows with Improved SPH Method

J. R. Shao

Chongqing University of Technology, No.69 Hongguang Road, Chongqing, China

E-mail Address: shaojiaru@cqut.edu.cn

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S. M. Li

Institute of Systems Engineering, China Academy of Engineering Physics, No.64 Mianshan Road, Mianyang, China

E-mail Address: hustmingsl@126.com

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, and

M. B. Liu

College of Engineering, Peking University, Institute of Ocean Research, Peking University, State Key Laboratory for Turbulence and Complex systems, No. 5, Yiheyuan Road, Beijing, China

E-mail Address: mbliu@pku.edu.cn

Corresponding author.

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https://doi.org/10.1142/S0219876216410012Cited by:15 (Source: Crossref)

Abstract

This paper presents an implementation of an improved smoothed particle hydrodynamics (SPH) method for simulating violent water impinging jet flow problems. The presented SPH method involves three major modifications on the traditional SPH method, (1) The kernel gradient correction (KGC) and density correction are used to improve the computational accuracy and obtain smoothed pressure field, (2) a coupled dynamic solid boundary treatment (SBT) is used to remove the numerical oscillation near the solid boundary and ensure no penetration condition, (3) a free surface condition, which is obtained from the summation of kernel function and volume, is used to describe the water jet accurately. Different cases about violent impinging jet flows are simulated. The influences of impact velocity and angles are investigated. It is demonstrated that the presented SPH method has very good performance with accurate impinging jet patterns and pressure field distribution. It is also found that the pressure time histories of observation points are greatly influenced by the rarefaction wave from surrounding air. Closer distance from free surface can lead to quicker decay of the pressure time history.

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