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Estimation of Force Coefficients for Bilge Keel and Skin Friction Roll Damping of Ships by CFD Simulations
Publikationstyp
Journal Article
Date Issued
2023
Sprache
English
Author(s)
Institut
Volume
134
Start Page
461
End Page
474
Citation
Fluid Mechanics and its Applications 134: 461-474 (2023)
Publisher DOI
Scopus ID
A finite-volume method (FVM) is used to simulate the roll motion of an ellipsoid equipped with wall-bounded flat plates with and without forward speed. Due to the circular form and a fixed roll axis of the simulated ellipsoid, only normal forces act on the plates. The normal force component in phase with the roll velocity over a harmonic roll period is estimated. The roll period, amplitude and the plate dimension are varied. The simulation results are compared with results of different model test techniques. The focus is set on modeling a simple definition for the normal force coefficient based on the Keulegan-Carpenter number (KC). To transfer roll damping results from model scale into full scale, the frictional roll damping component of different ships is investigated. FVM simulations of the roll motion for full and model scale are carried out. A simple extrapolation procedure based on Kato’s approach is developed.
Subjects
Bilge keels
Force coefficient method
Roll damping
Scale effects
Skin friction roll damping