Computational technologies for simulation of complex near-wall turbulent flows using unstructured meshes

The work is devoted to the peculiarities of the implementation of hybrid RANS-LES approaches of the DES family for simulation of complex near-wall turbulent flows using unstructured grids. The problems of determining required geometric characteristics in the mesh nodes and adaptation of hybrid approaches to the used numerical approximation scheme with high accuracy in space are considered. The classic benchmark problem of the decay of homogeneous isotropic turbulence and the results of the computation of complex turbulent flow near the wall with the presence of flow separation and reattachment are considered to verify the implemented techniques and to demonstrate its efficiency.