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- Title
Unsteady finite-depth effects during resistance tests on a ship model in a towing tank.
- Authors
Day, Alexander; Clelland, David; Doctors, Lawrence
- Abstract
Abstract This paper covers an extension of the study of Doctors et al. (J Ship Res 52(4):263–273, 2008) on oscillations in wave resistance during the constant-velocity phase of a towing-tank resistance test on a ship model to the case of relatively shallow water. We demonstrate here that the unsteady effects are very prominent and that it is essentially impossible to achieve a steady-state resistance curve in a towing tank of typical proportions for a water-depth-to-model-length ratio of 0.25. This statement is particularly true in the speed region near a depth Froude number of unity. However, on the positive side, we show here that an application of unsteady linearized wave-resistance theory provides an excellent prediction of the measured total resistance, when one accounts for the form factor in the usual manner. Finally, a simple application of the results to the planning and analysis of towing-tank tests is presented.
- Subjects
SHIP model testing; MARINE towing; WAVE resistance (Hydrodynamics); OSCILLATIONS; WATER depth; MARINE engineering
- Publication
Journal of Marine Science & Technology, 2009, Vol 14, Issue 3, p387
- ISSN
0948-4280
- Publication type
Article
- DOI
10.1007/s00773-009-0057-2