建筑风场任意六面体同位网格系统的数值模拟

Numerical Simulation of Wind Fields around Buildings Using Arbitrary Collocated Hexahedron Grids

开发了建筑风场数值模拟程序W SB,自动生成任意六面体同位网格系统,建立控制方程的离散方式,实现与网格系统相适应的通用S IM PLE算法.对于网格非正交性和两相邻单元的中心连线与其公共面中心点的错位等两方面进行的修正,以显式的处理归入源项中,以保证控制方程离散的统一性和程序的通用性.通过对双坡屋面建筑模型的风场数值模拟和正方体网格系统的建筑风场数值模拟结果进行比较,以及与风洞试验结果相比较,都有相一致的结果.

An in-house computer program, named Wind Simulation of Buildings （WSB）, is developed in this study to model wind fields around buildings. This program is capable of automatically generating collocated grids consisting of arbitrary hexahedrons, based on which the discreteness of the governing equation is formed. The general SIMPLE algorithm which is compatible with the generated grid, is implemented in the program. In addition, corrections are explicitly made in the source term in the governing equation to offset the negative effects of grid non-orthogonality and dislocation between the lines connecting the centroidal points of adiacent elements and the center of their common surface. This ensures the unification of the discreteness of the governing equation and the generality of the program. The wind field around a double-sloped building model is simulated using the developed program to validate the proposed method. The numerical results are compared with those from the tests of the meshes, composed of cubes, and the wind tunnel. It is demonstrated that the proposed method is more effective, accurate and general.