Towards Accurate Computations of Active Stabiliser Fins, focusing on Dynamic Stall
Author Fernandes, G., Kapsenberg, G.K., Kerkvliet, M. and Walree, F. van
Title Towards Accurate Computations of Active Stabiliser Fins, focusing on Dynamic Stall
Conference/Journal 15th International Ship Stability Workshop, Stockholm, Sweden
Month June
Year 2016

Abstract
Steps towards accurate and efficient characterisation of the hydrodynamic behaviour of active stabiliser fins have been conducted using computational fluid dynamics. Conditions seen at hydrodynamic testing facilities (Reynolds number = 135,000), with an angle of attack variation described as alpha(t) = 10 deg + 15 deg * sin(omega*t) have been modelled in two dimensions with various RANS turbulence models (k-omega SST, kskl, Spalart-Allmaras & LCTM) for reduced frequencies k=0.1 & 0.05. Solutions were compared to experimental results and results from other calculation methods (LES) and to results from a typical sea keeping code. The results showing the hysteresis loop for CL and CD show that a good agreement was seen to the literature. For seakeeping applications, moderate refinement in time and space is sufficient, and that the k-omega SST turbulence model best matches the CL and CD curves found in the literature. The increased knowledge of stabiliser fins dynamics will be used to improve time-domain seakeeping codes and possible also the control laws for active stabilizer fins.


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