CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Abstract

This study proposes a computational fluid dynamics (CFD)-modified potential (CMP) model. This hybrid model uses linear potential theory with a corrected damping ratio obtained from CFD simulations to analyze the seakeeping performance of a small vessel. According to the analysis procedure of the proposed model, a motion analysis, including the prediction of the roll and pitch damping ratio of a small barge, was conducted; to verify reliability; the results were compared to those of an experiment performed in a physical tank. The relative errors in the experiment for peak amplitude in the roll motion response amplitude operators (RAOs) using the CMP model were relatively small, whereas those obtained from only the potential analysis were large errors in all three conventionally used roll-damping ratios. In addition, the computational time consumed by the CMP model was longer than that consumed by the potential theory but faster than the full CFD simulation for all wave conditions. Subsequently, based on the motion analysis results, the seakeeping performance was evaluated in a real sea environment, and the results on the single significant amplitude (SSA) were discussed through comparison with the results of the potential analysis and experiment.

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“…Recently, Reynold Averaged Navier Stokes Computational Fluid Dynamics RANS CFD methods are used for seakeeping studies to account for viscous effects [60][61][62]. Nam et al [63] studied the seakeeping performance of a barge using a CFD-Modified potential flow hybrid model. The CFD methods are, however, outside the scope of this study.…”