[Cristian_Alex]

Hello every one,

I hope someone could help me.

I´m trying to simulate a Laminar Difusive Non-premixed Methane/Air Combustion in CFX.

The aim of this project is compare the results for the flame lenght varying the velocity of the flow with those experimental results encountered by Burke-Shunnemam and Rope.

The point is that the flame obtained is aproximatelly 3x bigger than the experimental data, and I´m having difficulty to discover what is the problem.


> Is a laminar flow (v=0,1m/s, T= 298K) in a cilindrical domain. Cilindrical methane inlet at the centeline, and a coflow air inlet;
> Finite Rate model is used in a 2 Steps reactions (oxidation of methane and oxidation of monoxide); NASA format;
> Radiation is desconsidered;
> Expert parameter Stiff Chemistry is used;
> Initial Domain is a 1400K with a small mass fraction of the elements.


I will be greatfull if someone could gave some advices, to solve this issue.