基于SPH方法的剪切流驱动液滴在固体表面变形运动数值模拟研究

光滑粒子流体动力学(SPH)方法是纯拉格朗日粒子方法，可以有效避免网格法在模拟大变形过程中带来的网格扭曲等缺陷，适合模拟含大变形的剪切流驱动液滴在固体表面变形运动过程。在基于CSF模型的表面张力SPH方法基础上，采用新的边界处理方式和界面法向修正方法，引入Brackbill提出的壁面附着力边界条件处理方法，得到了含壁面附着力边界条件的表面张力算法。基于新方法模拟了剪切流驱动液滴在固体表面变形运动过程并与实验结果和VOF方法模拟结果进行了对比验证。结果表明:该方法在处理壁面附着力问题时精度较高，稳定性较好，适合处理工程中剪切流驱动液滴在固体表面变形运动问题。

NUMERICAL Simulation OF Deformation and Motion of Droplet on solid Surface driven by shear flow Based on SPH Method

As a Lagrangian particle method, Smoothed Particle Hydrodynamics (SPH) method can deal with large deformation effectively without mesh distortion, which is different from traditional grid-based methods. Therefore, it is one of the most suitable methods to simulate the process of the deformation and motion of droplet on solid surface driven by shear flow. Based on the SPH methodology with continuum surface force (CSF) model for surface tension, a surface tension algorithm with boundary conditions of wall adhesion is derived using a new treatment of boundary conditions and a corrective algorithm of particles#x02019; interface normal, and by introducing Brackbill#x02019;s treatment of boundary conditions of wall adhesion. Based on the new method, the deformation and motion process of a droplet on solid surface driven by shear flow was simulated and the results were compared with the experiment data and VOF method. It is shown that the new method has higher accuracy and better stability, and it can be adapted to deal with the engineering problems such as the deformation and motion of droplets on solid surface driven by shear flow.