Offset jets are formed when a jet emanates from a nozzle of finite aspect ratio at an elevation from the channel bed. Submerged offset jets are often encountered as energy dissipation devices in hydraulic structures, mixing of effluents in rivers and streams etc. CFD study of a submerged offset jet (offset ratio 4) emanating from a nozzle into an open channel was carried out using the Improved Delayed Detached Eddy Simulation (IDDES). The free surface was captured using the volume of fluid (VOF) with High Resolution Interface Capturing (HRIC) scheme. The complex three-dimensional flow features of the offset jet captured by the simulation is qualitatively analysed by examining the vorticity field. The complexity of the offset jet flow field also serves to evaluate turbulence models used in CFD. The present study also serves as a benchmark for assessing the performance of the IDDES turbulence model.