{"id":378058,"date":"2024-08-13T05:22:27","date_gmt":"2024-08-13T05:22:27","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378058\/"},"modified":"2024-08-13T05:22:27","modified_gmt":"2024-08-13T05:22:27","slug":"378058","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378058\/","title":{"rendered":"Reply To: Ignition doesn&#8217;t start with GRI-Mech for methane"},"content":{"rendered":"<p>&lt;p&gt;HI Felix,&lt;\/p&gt;&lt;p&gt;Sorry for the delayed response. I think the notification got lost in my outlook emails.&lt;\/p&gt;&lt;p&gt;From your original post, i was of the impression that you were doing both FR and flamelet based modelling. But now from the last post, it is clear that you have using only FR approach and the difference between geom is mainly in the presence of bluff body. For the reaction to happen, Fuel and oxidizer need to be mixed within the flammability limit: this would have been achieved in the recirculation region close to bluff body and hence the system ignited with the hot temp trigger. You could compute the equivalence ratio using fuel and oxidizer mass fraction for the design w\/o bluff body and the best guess is- the system isnt properly mixed there.&lt;\/p&gt;&lt;p&gt;Based on your post in another Forum thread &#8211; i have a confusion in your original statement: why do you state that air-methane doesnt ignite while methane-air system ignites ? arent they the same.&lt;\/p&gt;&lt;p&gt;&nbsp;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-378058","reply","type-reply","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"HI Felix,Sorry for the delayed response. I think the notification got lost in my outlook emails.From your original post, i was of the impression that you were doing both FR and flamelet based modelling. But now from the last post, it is clear that you have using only FR approach and the difference between geom\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<link rel=\"canonical\" href=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378058\/\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"en_US\" \/>\n\t\t<meta property=\"og:site_name\" content=\"Ansys Learning Forum | Ansys Innovation Space\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"Reply To: Ignition doesn\u2019t start with GRI-Mech for methane | Ansys Learning Forum\" \/>\n\t\t<meta property=\"og:description\" content=\"HI Felix,Sorry for the delayed response. I think the notification got lost in my outlook emails.From your original post, i was of the impression that you were doing both FR and flamelet based modelling. But now from the last post, it is clear that you have using only FR approach and the difference between geom\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378058\/\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2024-08-13T05:22:27+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2024-08-13T05:22:27+00:00\" \/>\n\t\t<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n\t\t<meta name=\"twitter:title\" content=\"Reply To: Ignition doesn\u2019t start with GRI-Mech for methane | Ansys Learning Forum\" \/>\n\t\t<meta name=\"twitter:description\" content=\"HI Felix,Sorry for the delayed response. 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I think the notification got lost in my outlook emails.From your original post, i was of the impression that you were doing both FR and flamelet based modelling. 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I think the notification got lost in my outlook emails.From your original post, i was of the impression that you were doing both FR and flamelet based modelling. But now from the last post, it is clear that you have using only FR approach and the difference between geom","og:url":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/378058\/","article:published_time":"2024-08-13T05:22:27+00:00","article:modified_time":"2024-08-13T05:22:27+00:00","twitter:card":"summary_large_image","twitter:title":"Reply To: Ignition doesn\u2019t start with GRI-Mech for methane | Ansys Learning Forum","twitter:description":"HI Felix,Sorry for the delayed response. I think the notification got lost in my outlook emails.From your original post, i was of the impression that you were doing both FR and flamelet based modelling. 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