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The implementation and the combination of advanced boundary conditions and subgrid scalemodels for Large Eddy Simulations are presented. The goal is to perform reliable cold flowLES simulations in complex geometries, such as in the cylinders of internal combustionengines. The implementation of an inlet boundary condition for synthetic turbulencegeneration and of two subgrid scale models, the local Dynamic Smagorinsky and theWall-Adapting Local Eddy-viscosity SGS model ( WALE) is described. The WALE model is basedon the square of the velocity gradient tensor and it accounts for the effects of both thestrain and the rotation rate of the smallest resolved turbulent fluctuations and itrecovers the proper y3 near-wall scaling for the eddy viscosity withoutrequiring dynamic pressure; hence, it is supposed to be a very reliable model for ICEsimulation. Model validation has been performed separately on two steady state flowbenches: a backward facing step geometry and a simple IC engine geometry with one axedcentral valve. A discussion on the completeness of the LES simulation (i.e. LES simulationquality) is given

Boundary Conditions and SGS Models for LES of Wall-Bounded Separated Flows: An Application to Engine-Like Geometries