Learning Forum

[blanca.cerda]

Hello, I'm working on ansys fluent with 2D axisymmetrical geometry for  De Laval nozzle. Everything works fine. I've defined pressure inlet 3.4MPa and temperature 750K for gas (Nitrogen) and pressure outlet 0.1MPa and temperature 300K. Solved with k-omega Standard Model, Hybrid initialization. But at outlet far flow field, i have high temperature (equal to inlet 750K) when i should have arround 300K ambient temperature.
Do you know how to solve this problem? What should I have to set up to change this results? 
Thanks in advance,

[Rob]

Please can you post some images? 

[blanca.cerda]

Sure, 
Also, here you have more information of the setup:
- Axisymmetrical Geometry 
- Density-based solver
- Transient

- k-omega standard method

- Cell zone condition (surface-body): nitrogen (ideal gas/ Cp polytropic/ TC polytropic/ viscosity sutherland)

- inlet-pressure: 3.5MPa and temperature: 750K
- outlet-pressure: 0.1 MPa and temperature: 300K

- wall: no heat flux, no slip

- Solution methods: Implicit/ Roe FDS/ Least Squared Cells Bases/ 2nd order/ 2nd order/ 2nd order

This is the result for temperature, 

Its hybrid initialization, after that, al the CV is with the inlet temperature, if i try with standard initialization with 300K as temperature it doesn't converge. 

If you have any suggestions, corrections, and comments would help me a lot. 
Best regards, 
Blanca

[Rob]

The main domain outlet looks to be around 430K, or do you mean the hot region in the nozzle exit? How well resolved is the mesh?