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We present our approach to making direct numerical simulations of turbulencewith applications in sustainable shipping. We use modern Fortran and thespectral element method to leverage and scale on supercomputers powered by theNvidia A100 and the recent AMD Instinct MI250X GPUs, while still providingsupport for user software developed in Fortran. We demonstrate the efficiencyof our approach by performing the world's first direct numerical simulation ofthe flow around a Flettner rotor at Re=30'000 and its interaction with aturbulent boundary layer. We present one of the first performance comparisonsbetween the AMD Instinct MI250X and Nvidia A100 GPUs for scalable computationalfluid dynamics. Our results show that one MI250X offers performance on par withtwo A100 GPUs and has a similar power efficiency.

Large-Scale Direct Numerical Simulations of Turbulence Using GPUs and Modern Fortran