Learning Forum

[Alessio Pesciaioli]

Hello everyone, i'm doing a simulation of methane-air combustion to find out the flame speed.

I'm using a vertical 2D vessel with an air inlet and a fuel inlet at the bottom and an outlet at the top. My general settings are 2D, axisymmetric, transient, because i'm using a species transport model with eddy-dissipation turbolence model. Furthermore i have LES viscous model. I'm considering air and fuel inlets as mass-flow inlets and outlet as a pressure-outlet.

I'm using simple solution method and a second bounded order implicit transient formulation, but when i run the simulation with adaptve time advancement and CFL-based methode, it takes a very long time and never converges.

I have tried changing a lot of parameters but still have not found a solution to my problem, can you help me with any hints?

Best reguards,

alessio.

[Essence]

Hello,

Could you please share the mesh and case setup screenshots? And please provide the details about the quality of mesh.