{"id":405501,"date":"2025-01-18T08:58:09","date_gmt":"2025-01-18T08:58:09","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-the-flame-shape-differs-from-the-actual-results\/"},"modified":"2025-01-18T09:00:53","modified_gmt":"2025-01-18T09:00:53","slug":"fluent-the-flame-shape-differs-from-the-actual-results","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/fluent-the-flame-shape-differs-from-the-actual-results\/","title":{"rendered":"Fluent: The flame shape differs from the actual results."},"content":{"rendered":"<p>&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/18-01-2025-1737190753-OH mass fraction_experiment.PNG\" alt=\"\" width=\"323\" height=\"346\" \/>&lt;\/p&gt;&lt;p&gt;<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/01\/18-01-2025-1737190769-OH mass fraction_cfd.PNG\" alt=\"\" width=\"586\" height=\"305\" \/>&lt;\/p&gt;&lt;p&gt;&lt;p&gt;Hello, I am a&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;&nbsp;student using Fluent.&lt;br&gt;&lt;br&gt;I am simulating CH4\/H2 premixed gas turbine combustion using the partially premixed combustion model. However, I am facing an issue where the flame shape verified through the OH mass fraction differs slightly from experimental results. In the actual flam&lt;\/span&gt;&lt;span style=&#8221;font-size: 14pt;&#8221;&gt;e images, the outer flame root does not attach to the rim, but in the simulation, the outer flame root appears attached. Despite changing various settings, the flame shape in the simulation remains the same.&lt;br&gt;&lt;br&gt;I would like to ask for advice on how to adjust the settings to replicate the experimental result, where the outer flame root does not stabilize at the rim. For reference, I am currently using the k-epsilon turbulence model, and I have also tried switching to k-omega, but the results did not change. The GRI 3.0 mechanism is being used as well.&lt;br&gt;&lt;br&gt;Any advice would be greatly appreciated. Thank you.&lt;\/p&gt;&lt;\/span&gt;&lt;\/p&gt;<\/p>\n","protected":false},"template":"","class_list":["post-405501","topic","type-topic","status-publish","hentry","topic-tag-fluent-ansys-1","topic-tag-cfd-combustion","topic-tag-flamelet-1"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"Hello, I am a student using Fluent.I am simulating CH4\/H2 premixed gas turbine combustion using the partially premixed combustion model. However, I am facing an issue where the flame shape verified through the OH mass fraction differs slightly from experimental results. 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