Research of the high precision approach for Computational Fluid Dynamics based on VCAD System

随着计算流体力学（CFD）技术在各行业的广泛应用，复杂几何结构的网格生成已成为CFD实际应用中的瓶颈。基于日本理研研究所（RIKEN Institute）开发的用于存储几何形状和材料属性数据的VCAD （Volume CAD）框架，我们开发了一个通用的流动分析求解器，名为V-Flow3D，用于使用非结构化网格方法求解任意几何形状的三维不可压缩粘性流体流动和传热问题。在Novier-Stokes方程离散化中，提出了一种处理VCAD中kittaccube形状的新方法。本研究利用V-Flow3D软件对建筑风环境进行模拟，数值模拟结果显示了V-Flow3D在建筑设计规划中的实际应用。

With the extensive application of Computational Fluid Dynamics (CFD) technique in various industries, mesh generation for complex geometry is becoming a bottleneck in CFD practical use. Based on VCAD (Volume CAD) Framework, which is developed at RIKEN Institute for storing shape and material attribute data of geometry, we developed a general flow analysis solver, named as V-Flow3D, for three dimensional incompressible viscous fluid flows and heat transfer problems with arbitrary geometries using unstructured grid method. A novel approach has been proposed to deal with the shape of KittaCube of VCAD in Novier-Stokes equation discretization. In this study, the wind environment of buildings is simulated by using V-Flow3D software, and the numerical simulation results show the practical applications of V-Flow3D in the building design and planning.