Numerical simulation of wind-induced fluid-structure interactions for high-rise buildings based on FFD transform

In most cases of wind-induced aeroelastic analysis of high-rise buildings using a loosely coupled method, convergence difficulties and errors often occur due to the distortion of the continuity and coordination of deformation of the simple structural finite element models which usually have fewer nodal points than the outer mold surface defined by the fluid mesh. The deformation method of high-rise buildings is presented based on the free form deformation principle. Under the premise without changing the number and topology of the grid on the building surface, the high order continuous deformation of the large amount of fluid mesh using the information of a small amount of structural mesh deformation are achieved, by taking the structural nodal points as the control points. The validity and effectiveness of this method, which may model continuous curvature and complex torsion of high-rise buildings, are confirmed through an example and comparing with results from wind tunnel test and other published papers.