Seminar on Skin Friction Reduction with Supercavitation and Ventilated Cavitation for Underwater Bodies

Dr Warn-Gyu Park

Professor Emeritus

Pusan National University, Korea

This seminar will be chaired by Dr Eddie Ng.

Cavitation is widely observed in various propulsion systems and high speed underwater objects such as marine propellers, impellers of turbomachinery, hydrofoils, nozzles, injectors, torpedoes and underwater explosion. Besides of these engineering fields, it is also applied in biomedical and biological areas including drug delivery, detachment of cancer cells, destruction of kidney stones with HIFU(High Intensity Focused Ultrasound), needleless injection, sterilization of water, etc. In order to analyze these multiphase flows, the code should be able to handle both of incompressible and compressible flow features. But, it is very hard to do it because the matrix equation becomes very stiff.  In the presentation, the numerical methodology for multiphase flow analysis will be explained in detail and how the skin friction could be reduced by the super- and ventilated cavitation in supercavitating torpedo and other high speed underwater bodies. In addition, the process of bubble collapsing as well as underwater explosion will be also introduced.

Warn-Gyu Park received his Bachelor’s degree in Mechanical Engineering from Pusan National University, Busan, Korea in 1981 and his Master’s degree in Aeronautical Engineering from Korea Advanced Institute of Science and Technology (KAIST), Korea in 1983. Then, he worked in Korea Institute of Science and Technology (KIST) as a research scientist for 5 years. After then, he went to USA to continue his study and got his Ph.D. degree in Aerospace Engineering from Georgia Institute of Technology (Georgia Tech), Atlanta, Georgia, USA in 1993 under the supervision of Prof. Lakshimi Sankar. His Ph.D. thesis was on the numerical analysis of counter-rotating propeller by using the sliding multiblock and multigrid technique to accelerate the convergence. After his Ph.D. degree, He came back to Korea to join as the faculty member of School of Mechanical Engineering in Pusan National University, Busan, Korea. He served as the Dean of School of Mechanical Engineering in Pusan National University for 6 years, and also served as the President of the Korea Society of Computational Fluid Engineering in 2017. Nowadays, his research interests are in the area of multiphase flow simulation, FSI, underwater explosion, high sped water entry, bubble collapsing, etc.