Roll stabilization has been object of studies for more than one century, to improve safety, increase vessel operability and enhance onboard comfort. Active fins are a widespread stabilizing device, having the possibility to mitigate roll motion during navigation, based on the lift force, and at low speed/at anchor based on the reaction force generated by the moving fin. The present paper focuses on the mathematical modelling of the hydrodynamic force generated by the fin moving in the surrounding still fluid. Given the mathematical formulation of the force, its coefficients are determined by an optimization algorithm for three fin families. Computational Fluid Dynamics (CFD) is used to get the reference data for the optimization process. A generalized formulation is derived, leading to a unique set of coefficients for each analysed family, able to account for any projected area and aspect ratio. For each fin family, a sequence of two cycles according the given motion law is considered to verify the model. An overall good agreement is shown between the hydrodynamic force simulated by the adopted mathematical model with the obtained coefficients and the force by CFD simulations.

Hydrodynamic model of active fin stabilizers at zero advancing speed / Evangelista, Federico; Rosano, Gennaro; Begovic, Ermina; Cappiello, Pietro. - In: OCEAN ENGINEERING. - ISSN 0029-8018. - 314:(2024). [10.1016/j.oceaneng.2024.119745]

Hydrodynamic model of active fin stabilizers at zero advancing speed

Rosano, Gennaro
Secondo
Writing – Original Draft Preparation
;
Begovic, Ermina
Penultimo
Writing – Review & Editing
;
2024

Abstract

Roll stabilization has been object of studies for more than one century, to improve safety, increase vessel operability and enhance onboard comfort. Active fins are a widespread stabilizing device, having the possibility to mitigate roll motion during navigation, based on the lift force, and at low speed/at anchor based on the reaction force generated by the moving fin. The present paper focuses on the mathematical modelling of the hydrodynamic force generated by the fin moving in the surrounding still fluid. Given the mathematical formulation of the force, its coefficients are determined by an optimization algorithm for three fin families. Computational Fluid Dynamics (CFD) is used to get the reference data for the optimization process. A generalized formulation is derived, leading to a unique set of coefficients for each analysed family, able to account for any projected area and aspect ratio. For each fin family, a sequence of two cycles according the given motion law is considered to verify the model. An overall good agreement is shown between the hydrodynamic force simulated by the adopted mathematical model with the obtained coefficients and the force by CFD simulations.
2024
Hydrodynamic model of active fin stabilizers at zero advancing speed / Evangelista, Federico; Rosano, Gennaro; Begovic, Ermina; Cappiello, Pietro. - In: OCEAN ENGINEERING. - ISSN 0029-8018. - 314:(2024). [10.1016/j.oceaneng.2024.119745]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/992090
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