基于改进SPH的皮肤表面血流模拟算法

A bleeding simulation algorithm for skin surface based on improved SPH method

针对现有血流真实感绘制中采用的动力学模型精度较低的问题,提出一种基于改进光滑粒与动力学(smoothed particle hydrodynamics,SPH)的皮肤表面血流模拟算法。首先对血液模拟算法进行分析,选取Casson流体作为血液流动现象的流体动力学模型;然后,根据Casson流体的动力学方程的特点,对传统的SPH方法进行改进,并用改进后的方法对血液流动现象进行数值计算;最后将得到的血液粒子运动学信息用于模拟皮肤表面的血流过程。试验结果证明,该方法降低了传统方法的复杂度,提高程序的计算精度,为虚拟手术中对皮肤切口出血的仿真研究提供了新思路。

Aiming at lowdynamic model precision problem of the current blood flowrealistic graphics rendering methods,a bleeding simulation algorithm for skin surface based on improved SPH method was proposed. First,some blood flowsimulation algorithms were analyzed and the Casson model was selected as the fluid dynamics model of blood flow. Second,according to the characteristics of the dynamic equation of Casson fluid,the traditional SPH method was improved. Third,the improved method was used to calculate the blood flow. Finally,the obtained blood particle kinematics information was used to simulate the flowof the skin surface. The experimental results showed that the improved SPH method could reduce the complexity of the traditional method and improve the accuracy of the program,which would provide a newmethod for the skin incision bleeding simulation in virtual surgery.