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CRAFT Tech recently presented at the 2021 AIAA Aviation Forum. Jeremy Shipman and Jonghoon Bin were able to apply the turbulent properties from an ABL large eddy simulation (LES) as an unsteady inflow boundary condition for a ship airwake CFD simulation. Turbulent ABL is shown to have a significant impact on the ship wake dynamics and characteristics
An approach for incorporating the turbulent fluctuations present in the atmospheric boundary layer (ABL) into unsteady RANS CFD-based ship airwake simulations is presented. The turbulent properties are obtained from highly resolved large eddy simulation (LES) calculations of the ABL and applied to the ship airwake simulation with a transient inflow boundary condition that was developed and implemented in the CREATE-AV Helios software framework. The goal of these efforts is to develop higher-fidelity flight simulation models that can incorporate ABL turbulence for aircraft operating in the ship wake environment, or dynamic interface (DI). The ABL simulation approach is applied to a generic LPD-class ship airwake simulation. Results with and without the ABL boundary condition are compared to investigate the effect of the turbulent boundary layer on the ship wake dynamics, highlighting the importance of including these effects in flight simulation models.
Paper No. aiaa-2021-2481