In this paper the study of the behavior of the fuel flow through the injector nozzle using CFD tools is presented. Large Eddy Simulation will be used to model the internal flow turbulence in a Diesel fuel injector with velocities over 500 m/s. More specifically, the influence of boundary conditions applied to the model will be studied. The article analyzes the influence of the inlet boundary condition upon activation and maintenance of turbulent flow during the calculation. Carefully assessing which inlet boundary condition is more trustworthy in reality, for this the outlet velocity, pressure, turbulence and level of stabilization will be studied.This work has been funded by UNIVERSIDAD POLITECNICA DE VALENCIA from Spain, in the framework of the project "ESTUDIO DE LA INFLUENCIA DEL LEVANTAMIENTO DE AGUJA EN EL PROCESO DE INYECCION DIESEL'', Reference No. PAID-06-10-2362.Payri Marín, R.; Gimeno García, J.; Marti Aldaravi, P.; Bracho León, GC. (2013). Study of the influence of the inlet boundary conditions in a LES simulation of internal flow in a diesel injector. Mathematical and Computer Modelling. 57(7-8):1709-1715. https://doi.org/10.1016/j.mcm.2011.11.019S17091715577-
