摘要
针对传统基于网格剖分的数值模拟方法在处理流体机械动静干涉时,常因在动静交界面附近采用混合平面法以及网格间信息传递而带来的计算误差问题,介绍一种新的数值模拟方法———无网格移动粒子半隐式法(MPS),并将其应用于流体机械的数值模拟.该方法相对于传统网格法而言不需要进行网格剖分,从而对计算区域存在大变形的非定常流动问题可实现整场求解.以不可压缩流体为研究对象,从简单旋转流体机械算例入手,综合分析了采用移动粒子半隐式法模拟流体机械流场所需的运动边界模型、复杂几何边界离散方法、进出口边界模型和计算效率优化等基本条件以及目前的解决方案.此外,对算法的计算精度与稳定性、三维复杂情况的适用性、计算效率以及数据后处理等进行了评估,并以此为基础,对无网格法在流体机械模拟中的工程应用前景进行了展望.
Usually there are computational errors caused from the mixing plane approach to handle rotor-stator interaction and data transfer between mesh blocks when the interaction is treated with a conventional mesh-based numerical method. In order to solve this problem,a new numerical method—meshless moving particle semi-implicit method(MPS)is introduced to simulate a flow in fluid machinery. Comparing with mesh-based methods,for this meshless method,not only there is no need to generate a mesh,but also the entire unsteady flow field that is subject to large deformation can be calculated in one piece. For incompressible fluids,and starting with a simple rotating fluid machine,the basic issues,such as moving boundary model,discretization method for complex geometry,inlet / outlet boundary model and optimization of computational efficiency,which are needed for simulating flow in a fluid machine by using MPS method,were reviewed and analyzed. Furthermore,the accuracy and stability of MPS and its applicability in three-dimensional complex flow domains,computational efficiency and post processing were evaluated. Finally,a prospect that MPS method is going to be applied in flow simulation of fluid machinery in industry was presented.
出处
《排灌机械工程学报》
EI
北大核心
2013年第11期921-927,共7页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51106125
51236006)
中央高校基本科研业务费专项资金资助项目
