Subsonic Jet in Inviscid & Viscous Environments - Homework


Jet flows are quite common in multiple engineering applications ranging from internal combustion engines to jet engines and from water fountains to air vents. Essentially, these flows are characterized by fast-moving fluid exiting from a nozzle into quiescent surroundings.  The water exiting a hose is an excellent example of a jet. In this case, the surrounding quiescent fluid is air. The development and characteristics of the jet are strongly dependent on how the jet fluid interacts with the surrounding fluid.


In this example, you will simulate a subsonic air-jet exiting a converging nozzle into quiescent air. You will learn how to set up 2D axisymmetric simulations in two environments:

  • Inviscid
  • Viscous

Finally, you will understand how to interpret the results of the two simulations by comparing them with each other to identify differences and their causes.


Download the Mesh file needed for setting up the simulation and the associated Case & Data files from here. Follow the instructions below to set up this simulation in Ansys Fluent starting with a Mesh file. In case you face any issues setting up or running the simulation, then please use the corresponding initial and final Case and Data files.

Alternate video link.

Results and Discussion

Let's now compare the jets in viscous and inviscid environments.