Abstract The pathology of aortic diseases is related to wall shear stress, which in the lattice Boltzmann method can be easily calculated using information for the unit normal vector of computational geometry. This paper proposes a method to calculate the unit normal vector. In comparison with the existing method, this approach requires a smaller number of input parameters and significantly reduces the computational cost. Tests on several geometries indicate that this method is a better choice from the viewpoint of accuracy and operability. Finally, the distribution of wall shear stress in a realistic aortic arch is obtained and found to agree with the conclusions of a previous study.

中文翻译：

---

计算晶格玻尔兹曼模型中壁面剪应力的单位法向量

摘要 主动脉疾病的病理学与壁剪应力有关，在格子玻尔兹曼方法中可以使用计算几何的单位法向向量的信息轻松计算壁剪应力。本文提出了一种计算单位法向量的方法。与现有方法相比，该方法需要更少的输入参数，并显着降低了计算成本。对几种几何形状的测试表明，从准确性和可操作性的角度来看，这种方法是更好的选择。最后，获得了真实主动脉弓中壁剪应力的分布，并发现与先前研究的结论一致。