膜结构风致响应的分区耦合算法

采用完全隐式的分区耦合的方式,将用于计算流体流动和结构变形的软件结合起来.其中,结构和流场的几何模型分别通过有限元软件ANSYS和CFD软件建立.对流体域的模拟采用有限体积法,计算三维的、不可压缩的、湍动流动;对结构域的模拟采用有限元法,并且考虑了薄膜结构几何非线性.在每一时间步内对结构场、流体场依次求解,通过把前一个物理场的计算结果作为外荷载施加于后一个物理场来实现两个场的耦合.最后对一鞍形膜结构进行了风致响应计算,验证了这种耦合算法的可行性.

Partitioned Coupling Arithmetic of Wind-Induced Response of Membrane Structure

A numerical simulation approach for fluid-structure interaction on membrane structures is put forward by coupling two codes developed for flow simulation and structural dynamics in this paper.The coupling algorithm is partitioned.The geometrical model of the structure is built in FE software and the fluid is modeled in CFD software.The finite volume based CFD code is able to calculate three-dimensional,incompressible,turbulent flows.The structure simulations are performed by using a finite element program including algorithms for geometrically problems.Each simulation code runs on its own processor within each timestep.The results acquired from former code have been put on the latter one as outside loads.Wind-induced response of a saddle-backed membrane structure has been calculated,and the feasibility of the coupling algorithm has been verified.