基于不可压缩光滑粒子流体动力学的旋转强制动边界问题研究

Research on Incompressible Smoothed Particle Hydrodynamics-based Constraint Revolving Moving Boundary Problem

利用不可压缩光滑粒子流体动力学(Incompressible smoothed particle hydrodynamics,ISPH)方法,针对螺杆挤出数值模拟中提出的旋转强制动边界问题,采用FORTRAN语言编程,进行模拟计算。采用'静态粒子法'构建二维旋转强制动边界模型,同时构建基于相对运动假设的静边界模型。采用'参考压力法'解决了'张力不稳定性'。通过将旋转动边界模型的计算结果与静边界模型,以及商业软件FLUENT的计算结果进行比较研究,结果表明:该动边界处理方法简单有效,适当选取分辨率可以同时满足计算精度与运算速度的要求,选择具有高阶可导的核函数更佳。为三维复杂模型模拟奠定了基础。同时,该方法对于不同领域中的动边界问题的研究也具有一定参考价值。

Based on the incompressible smoothed particle hydrodynamics（ISPH） method,one constraint moving boundary problem in screw extrusion has been investigated,and the program is written in FORTRAN.The dummy particles are used to treat the moving boundary.A fixed boundary model is also simulated.The tensile instability is avoided by setting a reference pressure.Through comparing the results separately produced by the moving boundary model,the fixed boundary model and the commercial software FLUENT,it has been shown that the boundary treatment method is simple and effective,the algorithm is accurate and fast if an appropriate resolution is selected and the high order derivable kernel function could give a better result.It laid the foundation for the simulating of the more complex 3D model.It has something referential value for the research on moving boundary problems in various areas.