Computation of Scale Effects in Free-Surface Flows near a Ship’s Transom
Author Ploeg, A. van der, Chao, K., Marzi, J. and Wackers, J.
Title Computation of Scale Effects in Free-Surface Flows near a Ship’s Transom
Conference/Journal 13th Numerical Towing Tank Symposium (NuTTS'10), Duisburg
Month October
Year 2010

Abstract
In this paper we focus on the computation of the viscous free-surface flow including scale effects for a relatively difficult test case: a container ship with a partly wetted transom. This wetted transom poses some extra challenges for a computational method: the transition between the wetted and dry regime and the details of the flow and the free surface (possible wave breaking) behind the wetted part of the transom are hard to capture. The challenge is to compute accurately the flow both on model scale and full scale. Scale effects near transoms can become very important when at full scale a smaller part of the transom is wetted than at model scale, since this can have a strong effect on the resistance.
The good agreement with measurements and the strong similarity in the computed scale effects demonstrates that also for the more difficult case with a partly wetted transom, strong progress in free surface RANS methods has been achieved.

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