The objective of this project is to build improved jet noise prediction schemes through conducting jet LES calculations and validating these against the noise and turbulence experimental database from the NTF. The LES computations will cover: single stream and coaxial jets; jet velocity variation; jet temperature variation and coaxial jet area ratio variation. Further LES computations and validation will then cover effects of 3D nozzles, in particular the effect of the pylon. Collectively the LES and experimental results will feed the development of improved jet noise prediction methods.