Numerical study of an inverted fl ag in a unifor fl ow

摘要：

　　The dynamics of an inverted ag in a uniform ow for a three-dimensional model is studied numerically by an immersed boundary-lattice Boltzmann method for the uid and a nite element method for the ag.Four states of the ag performance are identied,namely,straight,apping,deected,and deected-apping states,depending mainly on the bending stiness of the ag.It is found that the ag becomes easier to transfer from the straight state to the apping state for a larger aspect ratio.The maximum drag force and bending energy of the ag in the apping state are both much larger than that of the deected state.The energy conversion ratio increases with the increase of the aspect ratio.The three-dimensional vortical structures in the wake of the ag are also analyzed for dierent states.Besides,the ag whose initial direction is parallel to the inow can acquire most energy from the uid comparing to other inow directions.The results obtained here are consistent with previous experiments and can provide some physical insights into the understanding of ow-structure interaction and energy conversion.

关键词： Inverted Flag Flow-structure Interaction Energy Conversion

作者: Chao Tang Ru-Nan Hua Nan-Sheng Liu Xi-Yun Lu

作者单位: Department of Modern Mechanics, University of Science and Technology of China,Hefei, Anhui 230026, China

会议类型: 国际会议

会议名称: The 8th International Conference of Computational Fluid Dynamics, (ICCFD8)(第八届国际计算流体力学会议)

会议地点: 成都

会议语种:英文

页码: 1-9

在线出版日期: 2014-07-25（万方平台首次上网日期，不代表论文的发表时间）