Fluid-structure interaction simulation of a tree swaying in wind field
Received:December 07, 2009  Revised:December 02, 2010
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KeyWord:tree  fluid-structure interaction  numerical method  virtual coupling surface  boundary fitting
胡潇毅 浙江农林大学 机电系,临安
陶伟明 浙江大学 工程力学系,杭州
郭乙木 浙江大学 工程力学系,杭州
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      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.