基于弱耦合的翼伞气动变形数值模拟

对不带气室翼伞和带气室翼伞的气动特性和结构变形进行三维数值模拟,分析气室对翼伞气动特性和结构变形的影响.流场方面,采用有限体积法求解Navier-Stokes控制方程,选用剪切应力输运(SST,Shear-Stress Transport)k-ω湍流模型;结构方面,假定翼伞有初始形状,使用插值方法映射传递流固交界面的压力数据,通过ANSYS计算翼伞伞衣的气动变形.结果表明:气室对阻力影响不大,对升力的影响主要表现在大迎角情况下;翼伞柔性和尺寸大小对其有利迎角的范围影响不大;翼伞的气动变形和最大主应力主要集中在气室中前部分,带气室翼伞由于有肋片加强的缘故,伞衣气动变形较小,一定程度上保证了翼伞的气动特性.

Numerical simulation of parafoil aerodynamics and structural deformation based on loose coupled method

The aerodynamic characteristic and structural deformation of two kinds of parafoils, one without cells and one with cells, were numerically simulated by utilizing loose coupled method to study the cell's effect on parafoil aerodynamic performance and structural deformation. In terms of fluid analysis, the finite volume method was used to solve Navier-Stokes equations and the shear-stress transport (SST) k-ω two-equation turbulence model was applied to simulate the turbulence. In terms of structure analysis, parafoils have initial shape was assumed and interpolation method was used to pass mapped pressure data in the interface. ANSYS was also used as a numerical solver. The final results show that cell has little effect on drag and its effect on lift occurs when angle of attack is high; parafoil's flexibility and size have little impact on the range of favorable angle of attack; the deformation and maximum principle stress are mainly concentrated in the middle of cells, the aerodynamic deformation of parafoil with cells is small because of the ribs and this ensures parafoil better aerodynamic characteristics to some extent.