Abstract
A hybrid RANS-LES approach is used to resolve the Fore-body Side Vortex (FSV) separating from the KVLCC2 hull at 30° drift angle and Reynolds number ReLoa ≈ 2.56e6. The performance of the DES approach is evaluated using a proper grid study. Besides, the following aspects of the CFD results are investigated: the resolution of turbulent energy, the prediction of instantaneous and time-averaged vortical structures, local flow features, the limiting streamlines and the evolution of the vortex core flow. New PIV data from wind tunnel experiments is compared to the latter. The results form a basis for future investigations in particular on the vortex interaction further downstream and the applicability of different kinds of turbulence models to trailing vortices like the FSV. Turbulence modelling is realised with the k-ω-SST-IDDES model presented in [1], the grids’ cell count is 6.4 M, 10.5 M and 17.5 M. Grid convergence of the time-averaged vortex core flow is observed. OpenFOAM version 1806 is used to carry out the simulations and snappyHexMesh to build the mesh.
Highlights
Coherent vortices occur for example as wing tip vortices
Most results are obtained with CFD, only the vortex core flow compared to PIV data
CFD verification The flow near the ship hull is computed in RANS mode down to the wall, so without wall functions
Summary
Coherent vortices occur for example as wing tip vortices. Several test cases have been investigated including e.g. We refer only to the experimental investigations as there are numerous publications on CFD validation studies. These coherent vortices trail downstream of a foil’s trailing edge as the free shear layer rolls up.
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