Abstract
Prediction of maneouvring motion of ships is quite important in the view point of practical ship design and safety of traffics at seas. The understanding of flow field around ship hull and accurate estimation of hydrodynamic forces and moments on the hull makes the better prediction possible.
As an application of dye tracer method, flows around a simple shaped ship model with drifting angle were observed in a towing tank. Surface streamlines and trailing vortices were visualized by means of luminous dye tracer injected from holes on the model surface. Some knowledge on the structure of flow field and experimental techniques of flow observation were obtained. Results of observation were compared with those of qualitative measurements and calculation of potential flows.
