类车体流固耦合现象实验及数值分析

Experimental and Numerical Analysis for Fluid structure Interaction Phenomenon of Ahmed Body

摘要:

以改进的类车体模型为对象，将流固耦合效应引入风洞实验和数值仿真中.基于车身位移测量数据，验证数值方法有效性.通过实验与仿真的方法，揭示了在引入流固耦合机制后车体所受气动力及力矩的变化规律及内在机理.研究表明：在车体设计中有必要考虑流固耦合效应.

关键词:流固耦合; 风洞实验; 计算流体动力学

Abstract:

The fluid structure interaction (FSI) effect was considered in the wind tunnel test and numerical simulation for the improved Ahmed body. The validity of numerical simulation method about FSI was confirmed with body displacement data which was measured by the scaled wind tunnel test. By experimental and numerical methods, the change regulation of aerodynamic force and moment was described when FSI was considered and the internal mechanism of the change of aerodynamic force and moment was revealed. It was concluded that the FSI effect should be considered in vehicle design.

Key words:fluid structure interaction (FSI); wind tunnel test; computational fluid dynamics (CFD)