任意六面体网格系统的建筑风致干扰数值模拟

采用任意六面体同位网格系统对控制方程进行离散,显式修正了网格非正交性和两相邻网格的错位,构建了与网格系统相适应的SIMPLE算法,并编制通用的建筑间风致干扰的数值模拟程序WSB.应用WSB和任意六面体同位网格系统,对中国沿海地区典型的低层双坡建筑物与上风不同体型建筑物之间的风致干扰进行数值模拟和分析.结果表明:任意六面体同位网格系统的生成、控制方程的离散、SIMPLE算法的实现以及程序WSB正确且有效;上风建筑对抗风起着积极的作用;上风建筑及其体型的不同对低层双坡屋面建筑坡面风压大小和分布形态影响显著.

Numerical Simulation of Wind Disturbance Using Arbitrary Collocated Hexahedron Grids

The paper proposed a new model to simulate wind disturbance around buildings.Using collocated grids consisting of arbitrary hexahedrons,the model firstly used the finite volume method to discretise the governing equation.The effects of grid non-orthogonality and dislocation between adjacent elements were explicitly corrected.The grid-compatible general SIMPLE algorithm was then realized.A computer program,named Wind Simulation around Buildings(WSB),was also developed accordingly.Detailed studies were conducted for the wind disturbance between two different buildings.The changes of the streamline and the pressure distribution were discussed.The numerical results indicate that the generation of grid systems,the discretization of governing equations,the implementation of the corresponding SIMPLE algorithms and the program WSB are correct and effective.It is also demonstrated that the upwind disturbing building and its different shape have significant effects on the roof pressures of the disturbed building.