Learning Forum

[khaledhmz12]

hello, I conducted a numerical simulation of propane-air using fluent, in the first case I use a chemical reaction mechanism contains 24 species and 66 reactions with species transport combustion model and Eddy dissipation concept for the net reaction rate with 79541 nodes (mesh size). the results obtained is predicted very well and the flame front is same with the experimental (figure1), but in the second case when I keep the same configuration as in case 1 and I only changed the mesh size to 151690, the flame temperature raised and its front changed (figure 2), and also its size being bigger than in the case 1,

I don't why this happen even I verified the B.C and the physics...

Can anyone help please

best,

[RK]

Hello,
How is the convergence for the finer mesh? Please make sure both the cases are converged well.

[khaledhmz12]

Hello, thank you for your reply
for the residual, I set 10 e(-5) for momentum, continuity, and every reaction equations and 10 e(-6) for the energy equation. the simulation run until 154000 iteration but the flame front don't change and the program doesn't stop, I'm really confused about it, any suggestion, please
best

[khaledhmz12]

hello, any help please I can't figure out this problem

[RK]

May I know what you mean when you say, program does not stop?

[khaledhmz12]

I mean the simulation doesn't converge and keep runing