Abstract: This paper takes the aerodynamic performance of FAW-Volkswagen BORA model as the research object. Using transient boundary seeding (TBS) technology, the drag coefficient of BORA remains the same with 86% simulation time reduced. Based on this, combined with Design Guide technology, taking drag coefficient and lift coefficient as research objects, the design variables composed of rear window angle and rear cover height are explored and optimized in the design space composed of 234 design points. Through 24 TBS runs, drag coefficient and lift coefficient could be reduced 3 counts and 15 counts separately. In addition, the interaction between design variables and response variables, as well as the optimization potential of the wind resistance coefficient in a given design space, can be further obtained by fitting the response surface and relationship graph information generated by the Design Guide.

Key words: TBS; Vehicle aerodynamic; Simulation cycle; Explore design space

摘要： 文章以一汽-大众 BORA 车型空气动力学性能为研究对象，使用瞬态边界种子（TBS） 技术，风阻系数保持不变，仿真耗时减少约 86%。以此为基础，结合 Design Guide 技术，以 阻力系数和升力系数作为研究对象，对由后风窗角度和后盖尾翼造型高度构成的设计变量进 行设计空间内的探索及优化。在 234 个全集变量组合的设计空间内，仅通过 24 个 TBS 计算， 完成 BORA 基本车型的风阻系数降低 3 counts，升力系数降低 15 counts。此外，通过 Design Guide 拟合生成的响应面及关系图信息，可进一步获取设计变量与响应变量间的相互作用关 系，以及给定设计空间内风阻系数的优化潜力。

关键词: TBS；整车空气动力学；仿真周期；设计空间探索