[Nachiket]

Hello!
I have been trying to analyse nozzle with chevrons at the end.
I made the geometry and extracted the fluid domains (for fine and coarse meshing) and meshed with mostly default settings.
After running the solution with the k-epsilon model, the nozzle outlet's velocity is coming out to be a lot lower than what it should be compared to theoretical calculations.
Is there any advice you would like to give? I am a beginner in CFD.
I have also attached an image of the model.