Abstract：

This paper presents a PIV (particle image velocimetry) image processing method for measuring flow velocities around an arbitrarily moving body. This image processing technique uses a contour-texture analysis based on user-defined textons to determine the arbitrarily moving interface in the particle images. After the interface tracking procedure is performed, the particle images near the interface are transformed into Cartesian coordinates that are related to the distance from the interface. This transformed image always has a straight interface, so the interrogation windows can easily be arranged at certain distances from the interface. Accurate measurements near the interface can then be achieved by applying the window deformation algorithm in concert with PIV/IG (interface gradiometry). The displacement of each window is evaluated by using the window deformation algorithm and was found to result in acceptable errors except for the border windows. Quantitative evaluations of this method were performed by applying it to computer-generated images and actual PIV measurements.

 

韩国科学技术院(KAIST)机械工程系教授。1978 年于首尔国立大学获学士学位，1980 年和1984 年于KAIST 分别获硕士和博士学位，之后留KAIST 任教至今。成亨镇教授兴趣广泛，其课题组研究内容涉及流动控制、流体-柔性体耦合、光电/微流体技术和印刷电子技术等，至今发表SCI 论文160 余篇,并多次受邀在国际学术会议上作大会报告。曾获得KAIST Grand Prix Academic Award (KAIST 最高学术奖，每年授予1 人，2009)、KAIST International Cooperation Award (2008)和Inter-Research Technology Award (from President，2003)等学术奖项。现为ASME,AIAA,KSME,韩国流动显示协会和日本流动显示协会等多家协会会员，湍流传热与传质国际会议顾问委员会成员，湍流与剪切流现象国际会议顾问委员会成员，Fluid Dynamics Research 杂志和Experiments in Fluids 杂志编委。