人体脑血流问题的并行数值模拟

The Parallel Numerical Simulation of Some Cerebral Flow

设计了一套高性能血流动力学数值模拟系统,包括几何模型构建、计算网格生成、流体方程离散和求解以及计算结果可视化和分析等模块.重点介绍流体方程的求解模块,并通过对北京天坛医院提供的1个真实脑中风病例(包括术前和术后)的血流动力学瞬态模拟案例来验证系统的可靠性和效率.模拟结果显示:计算获得的各项参数(包括压力、速度、剪切力等)的分布与临床观察结果基本一致.该系统的并行性能测试结果显示:当模型的网格单元数量为2.12×10~6,CPU核数扩展至128时,系统仍可达到72.43%的并行效率.

A set of high performance numerical simulation system for human hemodynamics is developed.The system includes the construction of 3D artery geometry from MRI images,unstructured mesh generation,the discretization and solution of the fluid flow equations,and the analysis of the generation of results.The flow equations solver part in this paper is mainly focused on and the reliability and efficiency of the system are verified by solving a real patient case of stroke(including preoperative and postoperative cases)which is provided by Beijing Tiantan Hospital.The results show that the computed values,including the pressure,the velocity and the wall shear stress are consistent with the clinical conclusion.Regarding to the parallel performance of the method,an almost linear speedup is obtained with up to 128 processor cores for a case with 2.12×10 6 mesh elements and the parallel efficiency is still around 72.43%.