reactingFoam

sufjanst · October 9, 2018, 11:23

Hey guys,
I have some problems with reactingFoam. I want to simply calculate the combustion on a premixed swirl burner with a methane-air mixture.
The problem is that the reaction occurs in the pipe before the swirler.
Does anybody have an idea what is the reason for this behaviour?

I use a Hybrid-Mesh, PaSR and Phi=1, full-premixed

Thank you!

Greetings
sufjanst

clapointe · October 9, 2018, 15:51

Results for reacting flows are hugely dependent on choice of reaction mechanism and combustion modeling (if at all). If I recall correctly, the PaSR scales the chemical timescale against the turbulence timescale (or vice-versa). If you are seeing unphysical behavior, it could be a good time to reevaluate model coefficients, to look for a mechanism tuned to your application, or to see if there are physics that you are erroneously including or missing (eg preheating). A good first step would be to look at the PaSR model coefficients.

Caelan

October 9, 2018, 11:23	reactingFoam	#1
sufjanst Member Join Date: Mar 2016 Posts: 73 Rep Power: 10	Hey guys, I have some problems with reactingFoam. I want to simply calculate the combustion on a premixed swirl burner with a methane-air mixture. The problem is that the reaction occurs in the pipe before the swirler. Does anybody have an idea what is the reason for this behaviour? I use a Hybrid-Mesh, PaSR and Phi=1, full-premixed Thank you! Greetings sufjanst

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October 9, 2018, 15:51		#2
clapointe Senior Member Join Date: Aug 2015 Posts: 494 Rep Power: 15	Results for reacting flows are hugely dependent on choice of reaction mechanism and combustion modeling (if at all). If I recall correctly, the PaSR scales the chemical timescale against the turbulence timescale (or vice-versa). If you are seeing unphysical behavior, it could be a good time to reevaluate model coefficients, to look for a mechanism tuned to your application, or to see if there are physics that you are erroneously including or missing (eg preheating). A good first step would be to look at the PaSR model coefficients. Caelan