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Keywords

DARPA Suboff, CFD, Maneuvering coefficients, Static drift

Document Type

Research Article

Abstract

Due to their military applications, submarines are expected to possess certain operational capabilities. Among these, maneuverability stands out as a critical feature, and the investigation and prediction of this capability in the early design stages is of particular importance. In this context, the present study aims to determine the maneuvering coefficients of the DARPA Suboff form’s bare hull model (AFF1) by employing the static drift method. Computational Fluid Dynamics (CFD) simulations were conducted in STAR-CCM+, and the results were validated against experimental data available in the literature. As a result of the hydrodynamic effects investigated under various speeds and drift angles, nondimensional maneuvering coefficients were obtained. The results indicate that, at low speeds, the Yv' coefficient exhibits a significant variation, whereas the Nv' coefficient does not show a substantial change. This suggests that, in low speed maneuvers, the lateral force component is more dominant than the yaw moment. The comparison of the study’s results with the Roddy (1990) experimental data demonstrated low average deviations approximately 3,5% for the X-direction force (longitudinal force), 9,5% for the Y-direction force (sway force), and 5% for the yaw moment; thus confirming the reliability of the numerical model for this geometry. These findings establish CFD as a reliable and efficient alternative method to experimental testing for the analysis of submarine maneuvering performance.

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