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CEE Guest Speaker - Dr. Yaojun Ge

Thursday, September 14, 2017
1:00 pm - 2:00 pm
Spencer Engineering Building (SEB)
Room: 3109

"Challenge and Frontier of Structural Wind Engineering"

Dr. Yaojun Ge                                 
Chair Professor, Department of Bridge Engineering
Director, State Key Laboratory of Disaster Reduction in Civil Engineering
Tongji University, Shanghai, China

Abstract: The history of wind engineering marked three unforgettable milestones towards the understanding of wind effect on engineering structures: mean wind, gust wind, and dynamic wind. Today, researchers and engineers worldwide face challenges in mitigating wind effects on large-scale civil engineering structures as urbanization becomes a trend of the economic development in modern societies; technological breakthroughs in wind mitigation could potentially be the fourth milestone in structural wind engineering. Current researches in structural wind engineering can be generally categorized into three groups: aerodynamic force models (theoretical method), boundary layer wind tunnel tests (experimental method), and computational fluid dynamics (numerical method). Based on the characteristics of boundary layer wind and wind effect on structures, the aerodynamic force models are basically stationary, steady or quasi-steady, and linear. Since 1960s when boundary layer wind tunnels were developed at Colorado State University and the University of Western Ontario, the difficulties and deficiencies in experimental approach are practical limits on turbulence simulation scales and the similitute law of physical models, which results in a bottleneck of Reynolds number simulation. Even with the most powerful supercomputers, large-scale structures under wind flows with high Reynolds number are difficult to simulate with high accuracy due to complexity and computational demand of the structures. Field measurements can be used to validate the results obtained from the above three approaches, but cannot be generalized in practice.

Stephanie Laurence
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