SPH Method with Surface Tension and Its Application in Droplets Colliding
Droplets colliding is of vital importance in spray of liquid propelknt. Smoothed particle hydrodynamics (SPH) method can solve the problems including coalescence and bouncing of colliding droplets in spray of liquid propellant without mesh distortion effectively from traditional grid-based methods. In this paper, SPH equations presented here are based on modified ()tt-Schnetter SPH method. A hybrid expression, which combines a standard SPH first derivative with a finite difference approximation of a first derivative, is used to replace the second derivative item in viscosity. It is tested via a Couette flow test The SPH results and series results are in close agreement Molecular cohesive pressure within van der Waals (vdW) model is used to cope with the surface tension which is then tested via the evolution of a liquid droplet under surface tension from initial square shape. It is suitable for macroscopic fact Finally, based on the illustrated SPH method three-dimensional problems of head-on and off-centre tetradecane collision dynamics of equal sized are simulated, simultaneity the collision of immiscible droplets with large surface tension difference namely, a water droplet and a diesel oil droplet, is also investigated. The simulation results are all showed a good agreement with experimental results. It is proved this method is suitable to solve large deformation such as collision of droplets.
smoothed particle hydrodynamics viscosity surface tension droplets colliding coalescence bouncing
Qiang Hongfu Chen Fuzhen Gao Weiran
201 Staff Room, Xian Hi-Tech Institute, Xian 710025, China
国际会议
2010 Asia-Pacific International Symposium on Aerospace Technology(2010 亚太航空航天技术研讨会 APISAT 2010)
西安
英文
1192-1195
2010-09-01（万方平台首次上网日期，不代表论文的发表时间）