人工髋关节润滑系统的流固耦合分析

Fluid-structure interaction analysis on lubrication system of artificial hip joint

目的在人工髋关节润滑系统研究中,对基于计算流体动力学和流固耦合技术的方法与传统的雷诺方程法进行比较。方法以金属对金属的全置换髋关节系统为研究对象,使用商业软件Adina作为计算平台,分别建立刚性和弹性流体动力学模型。结果使用基于计算流体动力学和流固耦合技术得到的润滑膜厚度曲线,中部有比较明显的凹陷现象,相较于传统的雷诺方程法得到的结果更为合理;人工髋关节系统的髋臼杯和股骨头的流固耦合表面在所施加的载荷的作用下发生了明显的弹性变形,且该变形和流体域中的压力分布相一致。结论使用基于计算流体动力学和流固耦合技术的方法计算人工髋关节系统的流体动力润滑性能比传统的雷诺方程法更为全面合理。

Objective To compare the method based on computational fluid dynamics（CFD） and fluid-structure interaction（FSI） with the traditional Reynolds equation method in the study of an artificial hip joint lubrication system.Methods Using business software Adina as a computing platform,the metal-on-metal total hip replacement（MOM THR） model was developed as the subject to establish the rigid and elastic CFD model,respectively.Results The film-thickness curve obtained by the CFDFSI method had a significant depression in the center,which was more reasonable than that obtained by the traditional Reynolds equation method.The model with elastic surface under the given load showed a significant deformation at the FSI surface of the acetabular cup femoral head,and the deformation was consistent with the pressure and film-thickness distribution in fluid field.Conclusions The CFDFSI method used here was more reasonable than the traditional method when computing the elasto-hydrodynamic lubrication of an artificial hip joint system.