应土木工程学院陈文礼教授和陈冠斌副研究员的邀请，韩国釜山国立大学（Pusan National University），韩国翰林院院士、Journal of Visualization主编Kyung Chun Kim教授将于2026年05月25日到06月09问我校，并作报告，欢迎感兴趣的师生参加。
报告时间：2026年05月29日 9:30-11:00
报告地点：土木工程学院303会议室
报告主题：Simultaneous free-surface and 3D flow measurements of a vortex ring in head-on collision with the air–water interface
Abstract
Quantitative vortex–free-surface coupling requires simultaneous measurement of interface deformation and subsurface flow, but it remains challenging because reflection/refraction near the interface degrade volumetric velocimetry. We present an integrated system that combines multiview stereo (MVS) free-surface reconstruction with four-dimensional particle tracking velocimetry (4D-PTV) for a Reynolds number, 2509 vortex ring in head-on collision with an air–water interface. The two subsystems share a common trigger and a single coordinate system. Stable operation under dual illumination is achieved by combining short time-window background subtraction with the inherent temporal consistency of Lagrangian tracking, which suppresses surface-related optical contamination in the high-speed images. The flow is measured at 600 Hz and the surface at 60 Hz, enabling time-resolved reconstruction of vortex evolution and surface deformation through approach, impact, spreading, and late-stage fragmentation with secondary structure. Measurement quality and alignment are validated by three checks: a kinematic-condition residual from free surface reconstruction that remains narrowly distributed near zero; a stress-free indicator from volumetric velocity gradients concentrated near the shear-free limit; and a correlation-based time-lag analysis showing physically consistent lag growth with depth and high correlation over most depths, peaking at 0.73. The results demonstrate a stable, well-registered simultaneous dataset suitable for quantitative studies of vortex–free-surface interaction.
报告人Kyung Chun Kim教授简介
Prof. KC Kim received his BA degree at Pusan National University, Korea in 1979. He received MS and Ph.D degree at KAIST, Korea in 1981 and 1987 respectively. Since 1983, he is a professor at School of Mechanical Engineering in Pusan National University (PNU), Korea. He was invited as a visiting professor from Ottawa University in Canada for 1989-1990. He joined at the department of theoretical and applied mechanics in University of Illinois, Urbana-Champaign, USA as an invited professor for 1996-1997. He was invited as a special foreign professor from the University of Tokyo, Japan for 2009-2010. On the basis of his research outcomes, he became a member of National Academy of Engineering in Korea in 2004. He received the outstanding paper awards (1995, 2002) from KSME and KOSEF. In 2009 and 2016, he received the Academic award and the first Yeosong award from KSME. He received Nakayama award in 2012 and Asanuma award in 2014 based on contributions in world Visualization society. KC Kim was selected as a PNU Distinguished Professor in 2018. In 2019, he received Busan Science and Technology award.
Prof. KC Kim is currently serving as an Editor in Chief for Journal of Visualization. In 2020, he was selected as the director of Regional Leading Research Center for Eco-friendly Smart Ship. His research interests include: Turbulence, Two-Phase Flows, Flow Visualization, and Artificial Intelligence.
