葛飾北斎筆 富嶽三十六景 神奈川沖浪裏

“The Great Wave off Kanagawa” by Katsushika Hokusai (1760-1849)

This woodblock print depicts masterly nonlinear phenomena of steepening and breaking of
water waves, which is used as the symbol of our group.

“View of the Whirlpools at Awa Naruto” (triptych) by Utagawa Hiroshige (1797-1858)

One of the famous prints by Hiroshige depicts vehement whirlpools due to vortex motions of fluid.
It is not too much to say that vortex constitute essence of fluid’s motion as well as wave.

Scope of Researches

Fluid Mechanics Group studies waves and oscillations in fluids or fluid-structure systems in terms of fluid mechanics and nonlinear mechanics. Topics cover wide range of phenomena which occur in nature or man-made objects. They include problems in acoustics, gas-dynamics, water waves, internal waves, capillary waves, dynamics of liquid sheets or drops, dynamics of structures traveling in a fluid or floating on it, and so on. Emphasis is placed on finding of new problems, and creation of physically relevant models to them as well as examining well established problems. Current researches are classified mainly into three areas:

1.Nonlinear acoustic problems such as generation of “acoustic soliton,” suppression of shocks, resonant excitation of unshocked high-amplitude oscillations in a tube, thermoacoustic waves and oscillations in tubes and resonators, in view of applications to acoustic problems associated with traveling of high-speed trains, novel technologies of acoustic compressors and acoustic heat engines,

2.Nonlinear phenomena involving liquid sheets and drops such as capillary waves, Marangoni effects for surface tension due to variations of temperature and concentration, break-up of sheets and formation of drops, in view of applications to micro- and nano-technologies, and bio- medical problems,

3.Nonlinear waves and oscillations in fluid-structure systems such as localization and delocalization in a spatially periodic structures like articulated beams or panels traveling in a fluid-filled tube or floating on water, chaotic oscillations of a beam in a fluid-filled tube, in view of applications to high-speed trains traveling in a tunnel, and large-scaled structures like “Megafloat.”

Faculity of Engineering Science Kansai University