报告题目：A Novel Hybrid Numerical Framework for Investigation of Three-Dimensional Tornadic Wind Effects

报告简介：A tornado combines three co‑existing kinematic components - updraft, translation, and rotation - producing a fully three‑dimensional, transient flow field. Accurately prescribing boundary conditions for such a system in conventional CFD frameworks is challenging, which helps explain the scarcity of truly three‑dimensional numerical studies on tornado–building interactions.

Motivated by recent advances in the immersed‑boundary method (IBM), we re‑tailored Rankine Combined Vortex Model (RCVM). Using the “relative‑motion” principle, the model treats the building as virtually translating toward a pinned, purely rotational flow. At a sufficiently distant outer boundary, the flow is therefore time‑invariant, eliminating the costly boundary‑condition updates required in the original RCVM and greatly accelerating computation.

In this study we extend the re‑tailored RCVM to three dimensions by incorporating a logarithmic vertical profile for velocity variation. The resulting 3‑D tornado inflow is embedded in a high‑order finite‑difference turbulence solver equipped with an IBM treatment of the moving building, yielding a practical and powerful tool for simulating tornado–structure interaction.

A case study on a prismatic building shows that the vertical (uplift) force component dominates the load spectrum in all three directions, corroborating field observations of the “uprooting” effect seen in many tornado disasters.

报告人：Dr. Jun Cao obtained his Bachelor degree in Aerodynamics in 1989 from Nanjing University of Aeronautics and Astronautics,China, and his Ph.D. degree in Mathematics in 1995 from Sorbonne University (formerly University of Paris VI), France. He joined Toronto Metropolitan University (TMU, formerly Ryerson University) in August 2000, and now he is a Professor of Mechanical and Industrial Engineering. At TMU, his research work has focused on mathematical modeling and numerical simulation of complex flows and transport phenomena of industrial interests; currently, he is conducting computational tornado dynamics analysis using their in-house immersed boundary (IB)-based CFD software packages.

报告时间：2025年8月3日下午3:00-5:30
报告地点：扬州大学瘦西湖校区数学学院617室
联系人：董琪翔
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