INVESTIGATION OF SCALE EFFECT CORRECTION FACTOR IN SHIP RESISTANCE MODEL TEST

Document Type : Research Note

Authors

Dept . of Mechanical Engineering Sharif University of Technology

Abstract

In small towing tanks , due to tank and model di­mension limitations, tests has been perfomLed atlow Reynolds number and lan1inar flow regimes. In this condition, flow momentum is low and as are­ sult, the probability of flow separation is high. This has been resulted to a difference in flow behavior around the model and prototype. Therefore the scale effect in model testing cannot be avoided, which will be grater in small towing tanks . For eorrec.tion of results in all towing tanks, the seale effec.t correction factor has been used. This paper is a result of tests done on a model of a 35000 tons Produet Carrier. Tests have been done with and without a turbulent simulator and the scale c.orrec.tion fac.tor for both conditions has been evaluated. Results show that, without a turbu­ lent simulator, this factor approximate ly has been changed linearly. And, in the case of using a turbu­ lent simulator, the amount of this factor decreased extremely and varied nonlinearly.

Keywords