Flamelet with GRI 3.0

Pat84 · February 14, 2013, 07:36

Hello there,

I´m trying to simulate a 2D Oxy-Fuel combustion with medium high velocity using the steady flamelet model. I´ve already simulate this case with EDC and Equilibrium, which was no problem. Now, after generating the flamelets and the PDF-Table for the GRI 3.0 Mech, the simulation creates very strange solutions. The Fluent output tells me, that there is a minimum PDF Table temperature in about 12k cells and even the temperature contour shows a cold bubble around the flame. I´ve tried a bunch of flamelet generation settings with always 40 flamelets and the flamelets are all converged, but all showing the same behaviour. What can be the problem?

Many thanks,
Patrick

Pat84 · February 15, 2013, 13:11

No idea? Hmmm, it seems like there is something like an pole point in the near of a scalar dissipation of 1.The temperature decreases and the co mole fraction increases at this point.

February 14, 2013, 07:36	Flamelet with GRI 3.0	#1
Pat84 Member Patrick Wollny Join Date: Apr 2010 Posts: 58 Rep Power: 16	Hello there, I´m trying to simulate a 2D Oxy-Fuel combustion with medium high velocity using the steady flamelet model. I´ve already simulate this case with EDC and Equilibrium, which was no problem. Now, after generating the flamelets and the PDF-Table for the GRI 3.0 Mech, the simulation creates very strange solutions. The Fluent output tells me, that there is a minimum PDF Table temperature in about 12k cells and even the temperature contour shows a cold bubble around the flame. I´ve tried a bunch of flamelet generation settings with always 40 flamelets and the flamelets are all converged, but all showing the same behaviour. What can be the problem? Many thanks, Patrick

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[blockMesh] could anyone post a simple cylinder mesh	guilherme	OpenFOAM Meshing & Mesh Conversion	46	October 23, 2020 18:18
reduced version of GRI 3.0 Mechanism	buxtsued	FLUENT	11	August 7, 2018 15:50
Problems with the unsteady flamelet Model	Christoph_84	FLUENT	2	April 24, 2015 17:20
Error with the unsteady flamelet Model	Christoph_84	FLUENT	0	February 25, 2010 12:06
second and final question about flamelet combustion model	AdidaKK	CFX	0	October 17, 2009 08:25

February 15, 2013, 13:11		#2
Pat84 Member Patrick Wollny Join Date: Apr 2010 Posts: 58 Rep Power: 16	No idea? Hmmm, it seems like there is something like an pole point in the near of a scalar dissipation of 1.The temperature decreases and the co mole fraction increases at this point.