Abstract
ABSTRACTLarge grid simulations are performed for surface combatant 5415 at straight-ahead and static drift conditions using unsteady Reynolds averaged Navier-Stokes (URANS) and detached eddy simulation (DES), and the results are validated using recently procured experimental data. Both URANS and DES predictions compared within 4% of the experimental data for forces, moment and wave elevation. Grids consisting of 50M to 100M cells are found to be sufficient to obtain the best URANS results, but even on such large grids, URANS is overly dissipative. On similar size grids, DES provides plausible description of the vortical structures for the straight-ahead case, and resolves more than 95% turbulence and performs better than URANS for the static drift case. However, DES shows turbulence trigger and modelled stress depletion issues. Overall, the study identifies that turbulence modelling is a major roadblock for an accurate prediction of vortical structures for ship flows.
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