CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   combustion natural gas burner (

Jorge Chacón Hernandez August 8, 2001 12:35

combustion natural gas burner

I´m working in design the a low NOx natural gas burner with Fluent.

I'm investigating numerically flow characteristics, heat transfer and combustion process in a fired 2 MW boiler furnace. Now,I encounter some problems. The convergence is very difficult.

Anybody has some advices for me? Thanks,


Jin-Wook LEE August 10, 2001 03:19

Re: combustion natural gas burner
In general, the convergence is one of major problem for CFD simulation, especially for combustion, multri-phase and so on. Following tips might be helpful to you.

1) Mesh skewness affects convergence behavior for most flow simulation, especially for combustion simulation.

2) Under-relaxation parameters frequently affect convergence behavior. For example, Fluent's default setting for species under-relaxation is 1.0. This value is not good for most combustion simulation. Set them as lower value(e.g., 0.8~0.9 or ...).

3) Enthalpy is very difficult to converge. Check your mesh skewness and adjust under-relaxation by trial & error. I usually use 0.8~0.95 for enthalpy under-relaxation.

Sincerely, Jinwook

david August 11, 2001 03:21

Re: combustion natural gas burner
A) In addition to Jin, don't try to consider everything in the first Place B) Proceed with step by step: laminar, 2d, low flow rate... DC

shahriar October 7, 2001 14:11

Re: combustion natural gas burner
hi dear friend

I am wroking on modeling of nozzle mixing gas burner we can share our problems and our developments

if agree to cooperate togather , I will be very happy .

kind regards shahriar .

sudhir May 26, 2010 07:03

Hi all
I am a Undergraduate student of mechanical engineering. I am working on a new Design of natural gas burner for domestic applications and simulating this model in CFX so i will be thankful if you could provide me some data and text of your research.My Email Id is

All times are GMT -4. The time now is 04:33.