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Ansys Learning Forum › Forums › Discuss Simulation › Fluids › Ignition doesn’t start with GRI-Mech for methane › Reply To: Ignition doesn’t start with GRI-Mech for methane

June 4, 2024 at 12:45 pm
felix512
Subscriber

 

 

Hi Vijay, thanks for yor answer.

I don't understand your question; the "Chemical Equilibrum" or "Steady Diffusion Flamelet" are available for Non-premixed models. Here I'm using the Species Transport model, with GRI Mech 3.0 and EDC. 

In the 1st case I had ignition : with a wall at 2000 K starting the ignition. The geometry had a bluff, which increase turbulence and so enable ignition.

In the 2nd case, I just removed the bluff, and keep the wall at 2000K. With this geometry, I don’t have ignition. I guess this is because there is less turbulences due to the bluff removed, while EDC needs turbulences to start chemical reactions (= ignition). I don’t know how to do… 

I want to use the GRI Mech (so I need species transport model). I already tried to patch a high temperature, and all species at 0.01, but it’s also not working.

Even when I don’t put a volumetric reaction, or just the Eddy Dissipation model, I don’t have ignition.

 

Thanks for your help

 

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