{"id":369838,"date":"2024-06-04T18:46:54","date_gmt":"2024-06-04T18:46:54","guid":{"rendered":"\/forum\/forums\/topic\/fluent-combustion-problem\/"},"modified":"2024-06-04T18:46:54","modified_gmt":"2024-06-04T18:46:54","slug":"fluent-combustion-problem","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-combustion-problem\/","title":{"rendered":"Fluent Combustion Problem"},"content":{"rendered":"

Hello, is there someone experimented in combustion simulations who can help me please ?<\/p>\n

Simulation 1 :<\/span> I made a methane – air combustion which worked perfectly. The geometry was with a bluff between the air and the fuel inlet.<\/p>\n

Simulation 2 : <\/span> Same as Simulation 1, I just removed the bluff (so now I have 2 parallel pipes for the inlets), but now there is no combustion occuring<\/strong>.<\/p>\n

Here are the parameters of the simulations :<\/span>
I’m doing a steady 2D axisymmetric simulation, of methane – air combustion.
Using Species Transport model, with Gri-Mechanism and EDC
Standard k-e model for turbulence, and adiabatic walls.<\/p>\n

For the simulation 1 with the bluff, I obtained an ignition after putting a wall on the bluff at 2000K. But when I remove the bluff (Simulation 2) , even setting a wall at 2000K between air inlet and fuel inlet doesn’t work.<\/p>\n

When I patch a high temperature, or species at 0.01 before or during the simulation, I still don’t have ignition. Same if I put the air and fuel inlet at 1300K, the results aren’t good.
When I use Eddy Dissipation model it also doesn’t work.<\/p>\n

Can someone help me please ?<\/p>\n

I think that’s a problem of turbulence. EDC needs a minimum of turbulences to starts chemical reactions. With the bluff geometry, enough turblences were created, but when I remove the bluff, there are maybe not enough turbulences to start the reactions ?<\/em><\/p>\n

Thank you very much for helping.<\/p>\n

[Pictures of Bluff and no bluff geometries] :<\/p>\n

<\/p>\n

<\/p>\n","protected":false},"template":"","class_list":["post-369838","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t