Hi,
Please try using EDM instead of FR, as methane-air reaction is a fast reaction with Da > 1. And I would suggest turbulent flow for proper mixing of air and fuel.
Refer to the user’s manual: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v231/en/flu_ug/flu_ug_chp_finrate.html
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