Proceedings of the 9th International Conference

on Hydrodynamics (ICHD 2010)

October 11 – 15, 2010,Shanghai, China
Editors: Y. S. Wu, S. Q. Dai, H. Liu, L. D. Zhou, X. C. Yang

Keynotes (3)

K1.  On the evolution and run-up of tsunamis

P. A. Madsen.

Dept. of Mechanical Engineering, Technical University of Denmark, Lyngby, Denmark.

Abstract :

The first part of this work investigates the validity of the classical solitry wave paradigm for tsunamis. Our study involves the evolution of transient waves, from the initial release of a hump of water, then propagating large distances over flat bottom and finally shoaling over a mildly sloping bottom from the ocean to the beach. We monitor the development of time- and space-scales and compare with solitary wave theory. Next, we simulate the disintegration of long waves into a train of undular bores and discuss the relevance of this phenomenon for tsunami runup. We conclude that solitary wave theory is not applicable for geophysical tsunamis. In the second part of this work, we derive new analytical run-up formulas for incoming single waves and leading depression N-waves, where the time- and space-scales can be chosen freely independent of the wave height. Finally, we derive a convolution formulation for the run-up of transient waves. This is compared with a numerical simulation and the results are in good agreement.

K2.  New developments and propeller design

G. Kuiper

Consultant , Bennekom, The Netherlands.

Abstract :

The use of newly available tools in propeller design is discussed. It is stated that new tools are too much used to imitate experimental results. The paper takes a step back and investigates new approaches to ship propeller design in which new tools are better integrated or calibrated.

K3.  Studies of hydrodynamics in fishlike swimming propulsion

Xi-yun Lu, Xie-zheng Yin, Ji-ming Yang, Bing-gang Tong

Department of Modern Mechanics, University of Science and Technology of China, Hefei, China.

Abstract :

In this paper, we will attempt to provide an overview on the hydrodynamics of fishlike swimming propulsion based on our recent workperformed experimentally, numerically and theoretically. We mainly present some typical work, including measurement on kinematics of free-swimming fish and prediction of dynamics acting on an arbitrarily deformable body, numerical and experimental simulations of flow over flapping and traveling wavy bodies, and the relevant biomimetic technology.