Research of interaction force coefficients based on model test in loading condition

Abstract

It is very difficult, for the component-type ship mathematical model, to estimate the interaction force coefficients among the hull, propeller and rudder. Some coefficients such as wake fraction and flow straightening coefficient were studied from the model tests in different loading conditions and the normal force of rudder was tested in captive model tests to obtain the coefficients. From these results of the tests, the flow straightening coefficients increase with the increase of trims or drafts. Similarly, wake fraction coefficients are larger for the large drafts, however, become small as the trims increase. The resistance is obviously different in fully loaded condition with the trims by stern, however, the difference is not evident when the draft decreases and the bulbous bow is above the water surface.