Learning Forum

[felix512]

Hello everyone, I have a question regarding the disponible species in post-processing phase of Steady Laminar Flamelet models in Fluent.

I'm making a lot of combustion simulations using the Steady Laminar Flamelet model (which uses a PDF Table), and my simulations are ok. In every cases I generate my own flamelets, importing 2 types of files : the "mechanism.inp" and "thermo.dat" files.

The problem is that once my simulations are finished, I want to to study some species that aren't disponible (I'm post-processing in Fluent). Fluent gives me the possibility to see the contour of 20 species only, but not the all ones I would like to study. For example it proposes the contour of HONO2 specie (I don't need it) and not NH2 specie (I need to study this one).

In the Fluent Guide 16.11 it says : "For the unsteady laminar flamelet model, mean species mass fraction are displayed for the first 15 species in the flamelet kinetic mech".

• But what about the Steady Laminar Flamelet model ? In my case, the 20 disponible species aren't the first 20 species which appear in my mechanism and thermodata files. 

So can someone help me to understand how Fluent choose the 20 workable species for post-processing phase, and how to change it ? I tried to search for a TUI command or a line to add in the thermo files but I didn't find anything. (I thought about putting like 0.001 mole fraction of the species i want in the fuel, but I would like to avoid this type of manipulation).

• Another question if you can also answer me : do you know if there's a way to post-process and see species contour in the CFD-Post software please ? I found nothing about it, and can see the contour of species only on Fluent.

Thanks for your help !

 

[Ren]

To get minor species included in the PDF table, you can either increase the "Maximum Number of Species" in the "Table" tab of the "Species Model" dialog box (please see the screenshot below), or enter a small value for the mass/mole fraction of the desired species in the "Boundary" tab as you already suggested. You can also do both.

Yes, you can plot species contour in CFD-Post just like other variables such as pressure.