Rounded pressure curve and flame quenching

[Kiran Kumar KR]

Subject: Pressure curve rounded and flame quenching in n-propanol + hydrogen blend

Dear Ansys Forum,

I am simulating an SI engine fueled with n-propanol enriched with hydrogen. Despite using a 0.2 mm mesh, optimized time steps, and adjusted combustion parameters, my pressure curve remains rounded and the flame quenches early. The solver log shows "flame has quenched completely." Any advice on resolving this issue would be appreciated. I have pinned two images related to pressure and turbulent flame speed too, see the attachments

Thank you.

[Ren]

Please provide details of

• geometry configuration
• mesh size controls
• model setup
• boundary conditions
• pressure plot
• temperature plot, 2d and 3d contours at CA values where combustion is expected
• species mole/mass fraction plots, 2d and 3d at CA values where combustion is expected
• velocity 3d plots at CA values where combustion is expected