Characterization by proper-orthogonal-decomposition of flow field around bridge slotted decks
For the limitations of the research methods, emphasis has always been put on the dynamics of the bridge sections when carrying the research of the mechanism of wind-induced vibrations with no concerns of the flow structure around the decks. The emergence of PIV(Particle Image Velocimetry) makes it possible of analyzing the flow structures. In order to inspect the relationship between the dynamics of the decks and the flow structures around the decks, the static force coefficients of the bridge slotted decks and the velocity maps are marked and analyzed using numerical wind tunnel tests. Snapshot POD method is carried out to analyze the flow structures around the decks to find the dominant vortices in the flow filed. The fluctuating velocity maps are reconstructed using the first several modes with most of the energy contained. The research shows that in the flow field around the decks there are some periodic moving vortices. Relationship is found between the rule of the kinemics of the vortices and the static force coefficients of the decks. The research in this paper will guarantee the theoretical basis for investigating the micro mechanism of wind induced vibrations of bridges using the method of PIV.
Proper-orthogonal-decomposition static force coefficients bridge slotted decks wake flow
W.Zhang Y.J.Ge T.C.Liu
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）