This paper looks at selected applications of advanced hydrodynamic simulations in the offshore oil & gas industry. Progress in computational techniques and hardware has opened the door to more advanced simulations. But do more advanced field equations really lead to better results? Or should we employ proven potential-flow codes along with the engineering insight and experience, as they are cheaper and faster? The answer is not trivial and needs to be found and justified for each application. But the paper shows applications of viscous flow simulations (RANSE) where potential flow simulations ruled supreme. Traditional arguments concerning computational time are eroded by massive parallel computation. The applications shown concern: second-order forces in waves, formal optimization of offshore structures, impact loads, short-crested irregular sea in RANSE simulations and vortex-induced vibration analyses.

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