[ksv]

Dear All,

Am simulating a converging diverging nozzle compressible flow problem. When I use the MARKER_EULER boundary condition at the walls I see the flow getting developed inside the nozzle whereas when I use a no slip condition i don't see the flow being developed inside the nozzle, as shown below. Appreciate the help.

[bigfootedrockmidget]

Does the solution converge? Is this a turbulent flow?
What does the mesh look like? What does the convergence look like?

[ksv]

Yes the flow is turbulent and it converges well. Tried both fine structured and unstructured mesh. By applying MARKER_EULER condition at nozzle walls I could get a close match with Fluent but in the ambient there is some discrepancy as shown below.

[bigfootedrockmidget]

Where does the discrepancy occur, is it the light blue region at the centerline, almost at the exit of your domain?(or at least the exit of the pixture)? It looks like there is a low velocity core region surrounded by a higher velocity region in the jet. It does not look physically correct there.

Are you sure that in that region the SU2 solution is also converged or are the local residuals still high there?
It might also be that there is too much diffusion of the jet due to a too coarse mesh + lower order discretisation (this might be different in fluent), but then the rest of the jet (in radial direction) should also have a much lower velocity. You could check this with a finer mesh in the jet region, or use a second order scheme if your current method was first order.

[ksv]

Thanks for your reply. Will get back with more data. Great day.