The hydrodynamic analysis of the fully appended DARPA SUBOFF model in the SPMM tests integrating the LES model with the dynamic mesh method

To investigate the hydrodynamic coefficients of the fully appended DARPA SUBOFF model under various motion modes, this study develops user-defined functions within a computational fluid dynamics (CFD) model to simulate sting-supported planar motion mechanism tests. A dimensionless yawing velocity (r′) is proposed to evaluate the influence of motion periods and amplitudes on the hydrodynamic coefficients. Taking advantage of high-resolution turbulence simulation, reduced model dependency and applicability to complex geometries, this study integrates large eddy simulation and the dynamic mesh method to simulate each motion mode. Discrepancies between simulation results and experimental data for some velocity-dependent force derivatives in oblique towing tests may be linked to the rotational centers of the planar motion mechanism (PMM) supports. Variations in PMM devices affect some acceleration-dependent moment derivatives in pure sway and heave tests. Finally, turning circle maneuvers were conducted to verify the effectiveness of the simulated hydrodynamic coefficients.