Learning Forum

[felice_lucivero]

Hello everybody,

I am running a CFD simulation of a supersonic air intake, with a thermally and calorically perfect air gas flowing through it.

I set the ideal gas tag in the material properties.

I have also checked that the Mach number is present in the Data File Quantities.

I can't find out why it is missing when I try to plot the contours, either in Fluent and in the Post-Processing option.

I hope you can help me out with this.

[Luca B.]

I tested with 2023R2 version and I can see Mach Number in the post processing tools into Fluent. 

Can you check if you are using the right Material inside the "fluid" Cell zone? If you use a wrong or different material the Mach Number could not be visible.

[felice_lucivero]

 

Yes, the material should be properly set; it is air, I attached a snapshot.

Is it possible that the error arises from the workflow?

Thank you for replying.

 

[Luca B.]

Please double check also Cell zone Condition if the material used is "air". 

Your workflow seems to be right. Are you experiences your problem with CFD- Post also?

[felice_lucivero]

The cell zone condition seems to be fine as well.

Yes, I'm experiecing the same issue also in CFD-Post.

[Rob]

Please can you post a plot of the velocity contour? 

[felice_lucivero]

Here it is:

[Rob]

It should be there. What are you seeing in the panel?

[felice_lucivero]

Thank you Rob, I solved it.

I switched to a density based model and imposed autosave every 100 iterations.

[Rob]

That shouldn't make a difference: pressure based is good for Mach 2-3 and higher in some scenarios. 

[felice_lucivero]

I am actually trying to replicate the reuslts of a paper; in this latter they imposed a density-based solver, that's why I switched.

Probably the autosave option was not swicthed on, I don't know.