基于VBA的螺旋桨流固耦合数值模拟

针对近年来广受关注的船用螺旋桨水弹性问题,采用面元法（BEM）进行螺旋桨水动力分析,基于有限元（FEM）进行桨叶结构分析,在Excel VBA环境中借助于Shell函数分别调用BEM代码和FEM模块,实现了螺旋桨稳态性能的双向流固耦合数值模拟.算例对DTMB4119桨分别采用＂刚性＂铝青铜和＂弹性＂S玻璃纤维两种各向同性材料进行了求解,计算结果表明,弹性桨变形量远大于刚性桨,变形形态以轴向和周向的弯曲为主,体现为侧斜和纵倾的改变;桨叶螺距基本不发生变化,其水动力性能与＂刚性＂桨保持一致,两者的应力分布也基本相当.相关研究结论可为后续复合材料螺旋桨水弹性分析与设计工作提供前期基础.

Numerical Simulation of Propeller Fluid-structure Interaction Based on VBA

In view of hot issue of marine propeller hydroelasticity,boundary element method（BEM）is adopted for hydrodynamics analysis while finite element method（FEM）is adopted for structure analysis,and the two of them are combined in Excel visual basic application（VBA）by using the Shell function to fulfill the numerical simulation of propeller fluid-structure interaction.Propeller of DTMB4119 with isotropy material of＂rigid＂aluminum bronze and＂elastic＂S glass fiber were selected to test the capability of platform addressed.The results show that elastic propeller has greater deformation than their rigid counterpart,and the main characteristics of deformation is the circumferential and axial bending which reflects the change of skew and rake;the pitch distribution,hydrodynamics and stress distribution of elastic propeller remain the same of rigid propeller.The relevant conclusions addressed will be helpful for the further study on hydroelastic analysis and design of composite propeller.