树木在风中摇曳的流固耦合数值模拟方法探索

树木在风中摇曳是一个流固耦合问题,但树的结构复杂,无法直接用已有的流固耦合数值方法来模拟.本文提出一种基于虚拟耦合面的流固耦合方法,该方法用一个虚拟的连续曲面把树冠包裹起来,在这个曲面上建立流固耦合关系,并将虚拟曲面上计算得到的风荷载作为树木结构的外力进行加载.虚拟耦合面本身不妨碍树木枝条的运动,且能避免在每个枝条、树...

Fluid-structure interaction simulation of a tree swaying in wind field

A tree swaying in wind field is a fluid-structure interaction (FSI) problem, however, tree structure is very complicated and the problem cannot be simulated using the existing FSI simulation methods. A special FSI simulation method based on virtual coupling surface is proposed in this paper, and the method was realized by enclosing the tree canopy with a virtual continuous curved surface as fluid-structure interaction interface, the calculated wind load on the virtual curved surface was exerted onto the tree structure as an external load. The virtual coupling surface does not obstruct the motion of tree branches, and the difficulty of establishing coupling surface on every branch and leaves can be avoided. The solution algorithm of the numerical model is based on a non-boundary fitting FSI algorithm supplied by the MSC.Dytran code, and the method proposed can be easily implemented by inserting a user programmed module into the MSC.Dytran user programming interface.